// Copyright (c) 2024, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
//
// API docs from [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web).
// Attributions and copyright licensing by Mozilla Contributors is licensed
// under [CC-BY-SA 2.5](https://creativecommons.org/licenses/by-sa/2.5/.

// Generated from Web IDL definitions.

// ignore_for_file: unintended_html_in_doc_comment

@JS()
library;

import 'dart:js_interop';

import 'battery_status.dart';
import 'clipboard_apis.dart';
import 'credential_management.dart';
import 'css_font_loading.dart';
import 'css_typed_om.dart';
import 'cssom.dart';
import 'cssom_view.dart';
import 'dom.dart';
import 'encrypted_media.dart';
import 'entries_api.dart';
import 'fetch.dart';
import 'fileapi.dart';
import 'gamepad.dart';
import 'geolocation.dart';
import 'geometry.dart';
import 'hr_time.dart';
import 'indexeddb.dart';
import 'media_capabilities.dart';
import 'media_playback_quality.dart';
import 'media_source.dart';
import 'mediacapture_streams.dart';
import 'mediasession.dart';
import 'netinfo.dart';
import 'permissions.dart';
import 'picture_in_picture.dart';
import 'remote_playback.dart';
import 'requestidlecallback.dart';
import 'scheduling_apis.dart';
import 'screen_wake_lock.dart';
import 'selection_api.dart';
import 'service_workers.dart';
import 'speech_api.dart';
import 'storage.dart';
import 'trusted_types.dart';
import 'uievents.dart';
import 'vibration.dart';
import 'video_rvfc.dart';
import 'web_locks.dart';
import 'web_share.dart';
import 'webcryptoapi.dart';
import 'webidl.dart';
import 'webmidi.dart';
import 'xhr.dart';

typedef HTMLOrSVGScriptElement = JSObject;
typedef MediaProvider = JSObject;
typedef RenderingContext = JSObject;
typedef HTMLOrSVGImageElement = JSObject;
typedef CanvasImageSource = JSObject;
typedef OffscreenRenderingContext = JSObject;
typedef EventHandler = EventHandlerNonNull?;
typedef OnErrorEventHandler = OnErrorEventHandlerNonNull?;
typedef OnBeforeUnloadEventHandler = OnBeforeUnloadEventHandlerNonNull?;
typedef TimerHandler = JSAny;
typedef ImageBitmapSource = JSObject;
typedef MessageEventSource = JSObject;
typedef BlobCallback = JSFunction;
typedef CustomElementConstructor = JSFunction;
typedef FunctionStringCallback = JSFunction;
typedef EventHandlerNonNull = JSFunction;
typedef OnErrorEventHandlerNonNull = JSFunction;
typedef OnBeforeUnloadEventHandlerNonNull = JSFunction;
typedef FrameRequestCallback = JSFunction;
typedef DocumentReadyState = String;
typedef DocumentVisibilityState = String;
typedef CanPlayTypeResult = String;
typedef TextTrackMode = String;
typedef TextTrackKind = String;
typedef SelectionMode = String;
typedef PredefinedColorSpace = String;
typedef CanvasFillRule = String;
typedef ImageSmoothingQuality = String;
typedef CanvasLineCap = String;
typedef CanvasLineJoin = String;
typedef CanvasTextAlign = String;
typedef CanvasTextBaseline = String;
typedef CanvasDirection = String;
typedef CanvasFontKerning = String;
typedef CanvasFontStretch = String;
typedef CanvasFontVariantCaps = String;
typedef CanvasTextRendering = String;
typedef OffscreenRenderingContextId = String;
typedef ScrollRestoration = String;
typedef DOMParserSupportedType = String;
typedef ImageOrientation = String;
typedef PremultiplyAlpha = String;
typedef ColorSpaceConversion = String;
typedef ResizeQuality = String;
typedef WorkerType = String;

/// The **`HTMLAllCollection`** interface represents a collection of _all_ of
/// the document's elements, accessible by index (like an array) and by the
/// element's
/// [`id`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/id).
/// It is returned by the [document.all] property.
///
/// `HTMLAllCollection` has a very similar shape to [HTMLCollection], but there
/// are many subtle behavior differences — for example, `HTMLAllCollection` can
/// be called as a function, and its `item()` method can be called with a string
/// representing an element's `id` or `name` attribute.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLAllCollection).
extension type HTMLAllCollection._(JSObject _) implements JSObject {
  external Element operator [](int index);

  /// The **`namedItem()`** method of the [HTMLAllCollection] interface returns
  /// the first [Element] in the collection whose `id` or `name` attribute
  /// matches the specified name, or `null` if no element matches.
  external JSObject? namedItem(String name);

  /// The **`item()`** method of the [HTMLAllCollection] interface returns the
  /// element located at the specified offset into the collection, or the
  /// element with the specified value for its `id` or `name` attribute.
  external JSObject? item([String nameOrIndex]);

  /// The **`HTMLAllCollection.length`** property returns the number of items in
  /// this [HTMLAllCollection].
  external int get length;
}

/// The **`HTMLFormControlsCollection`** interface represents a _collection_ of
/// HTML _form control elements_, returned by the [HTMLFormElement] interface's
/// [HTMLFormElement.elements] property.
///
/// This interface replaces one method from [HTMLCollection], on which it is
/// based.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormControlsCollection).
extension type HTMLFormControlsCollection._(JSObject _)
    implements HTMLCollection, JSObject {
  /// The **`HTMLFormControlsCollection.namedItem()`** method returns
  /// the [RadioNodeList] or the [Element] in the collection whose
  /// `name` or `id` match the specified name, or `null` if
  /// no node matches.
  ///
  /// Note that this version of `namedItem()` hides the one inherited from
  /// [HTMLCollection]. Like that one, in JavaScript, using the array bracket
  /// syntax with a `String`, like `collection["value"]` is
  /// equivalent to `collection.namedItem("value")`.
  external JSObject? namedItem(String name);
}

/// The **`RadioNodeList`** interface represents a collection of elements in a
/// `form` returned by a call to [HTMLFormControlsCollection.namedItem].
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/RadioNodeList).
extension type RadioNodeList._(JSObject _) implements NodeList, JSObject {
  /// If the underlying element collection contains radio buttons, the
  /// **`RadioNodeList.value`** property represents the checked radio
  /// button. On retrieving the `value` property, the `value` of the
  /// currently `checked` radio button is returned as a string. If the
  /// collection
  /// does not contain any radio buttons or none of the radio buttons in the
  /// collection is in
  /// `checked` state, the empty string is returned. On setting the
  /// `value` property, the first radio button input element whose
  /// `value` property is equal to the new value will be set to
  /// `checked`.
  external String get value;
  external set value(String value);
}

/// The **`HTMLOptionsCollection`** interface represents a collection of
/// [`<option>`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/option)
/// HTML elements (in document order) and offers methods and properties for
/// selecting from the list as well as optionally altering its items. This
/// object is returned only by the `options` property of
/// [select](https://developer.mozilla.org/en-US/docs/Web/API/HTMLSelectElement).
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLOptionsCollection).
extension type HTMLOptionsCollection._(JSObject _)
    implements HTMLCollection, JSObject {
  external void operator []=(
    int index,
    HTMLOptionElement? option,
  );
  external void add(
    JSObject element, [
    JSAny? before,
  ]);
  external void remove(int index);
  external int get length;
  external set length(int value);
  external int get selectedIndex;
  external set selectedIndex(int value);
}

/// The **`DOMStringList`** interface is a legacy type returned by some APIs and
/// represents a non-modifiable list of strings (`DOMString`).
///
/// This interface was an
/// [attempt to create an unmodifiable list](https://stackoverflow.com/questions/74630989/why-use-domstringlist-rather-than-an-array/74641156#74641156)
/// and only continues to be supported to not break code that's already using
/// it. Modern APIs represent list structures using types based on JavaScript
/// [arrays](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array),
/// thus making many array methods available, and at the same time imposing
/// additional semantics on their usage (such as making their items read-only).
///
/// These historical reasons do not mean that you as a developer should avoid
/// `DOMStringList`. You don't create `DOMStringList` objects yourself, but you
/// get them from APIs such as `Location.ancestorOrigins`, and these APIs are
/// not deprecated. However, be careful of the semantic differences from a real
/// array.
///
/// This interface is used in
/// [IndexedDB](https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API)
/// and in the [Location] API:
///
/// - [IDBDatabase.objectStoreNames]
/// - [IDBObjectStore.indexNames]
/// - [Location.ancestorOrigins]
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/DOMStringList).
extension type DOMStringList._(JSObject _) implements JSObject {
  /// The **`item()`** method returns a string from a
  /// [`DOMStringList`](https://developer.mozilla.org/en-US/docs/Web/API/DOMStringList)
  /// by index.
  external String? item(int index);

  /// The **`contains()`** method returns a boolean indicating whether the given
  /// string is in the list.
  external bool contains(String string);

  /// The read-only **`length`** property indicates the number of strings in the
  /// [DOMStringList].
  external int get length;
}

/// The **`HTMLElement`** interface represents any
/// [HTML](https://developer.mozilla.org/en-US/docs/Web/HTML) element. Some
/// elements directly implement this interface, while others implement it via an
/// interface that inherits it.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement).
extension type HTMLElement._(JSObject _) implements Element, JSObject {
  /// Creates an [HTMLElement] using the tag 'article'.
  HTMLElement.article() : _ = document.createElement('article');

  /// Creates an [HTMLElement] using the tag 'section'.
  HTMLElement.section() : _ = document.createElement('section');

  /// Creates an [HTMLElement] using the tag 'nav'.
  HTMLElement.nav() : _ = document.createElement('nav');

  /// Creates an [HTMLElement] using the tag 'aside'.
  HTMLElement.aside() : _ = document.createElement('aside');

  /// Creates an [HTMLElement] using the tag 'hgroup'.
  HTMLElement.hgroup() : _ = document.createElement('hgroup');

  /// Creates an [HTMLElement] using the tag 'header'.
  HTMLElement.header() : _ = document.createElement('header');

  /// Creates an [HTMLElement] using the tag 'footer'.
  HTMLElement.footer() : _ = document.createElement('footer');

  /// Creates an [HTMLElement] using the tag 'address'.
  HTMLElement.address() : _ = document.createElement('address');

  /// Creates an [HTMLElement] using the tag 'dt'.
  HTMLElement.dt() : _ = document.createElement('dt');

  /// Creates an [HTMLElement] using the tag 'dd'.
  HTMLElement.dd() : _ = document.createElement('dd');

  /// Creates an [HTMLElement] using the tag 'figure'.
  HTMLElement.figure() : _ = document.createElement('figure');

  /// Creates an [HTMLElement] using the tag 'figcaption'.
  HTMLElement.figcaption() : _ = document.createElement('figcaption');

  /// Creates an [HTMLElement] using the tag 'main'.
  HTMLElement.main() : _ = document.createElement('main');

  /// Creates an [HTMLElement] using the tag 'search'.
  HTMLElement.search() : _ = document.createElement('search');

  /// Creates an [HTMLElement] using the tag 'em'.
  HTMLElement.em() : _ = document.createElement('em');

  /// Creates an [HTMLElement] using the tag 'strong'.
  HTMLElement.strong() : _ = document.createElement('strong');

  /// Creates an [HTMLElement] using the tag 'small'.
  HTMLElement.small() : _ = document.createElement('small');

  /// Creates an [HTMLElement] using the tag 's'.
  HTMLElement.s() : _ = document.createElement('s');

  /// Creates an [HTMLElement] using the tag 'cite'.
  HTMLElement.cite() : _ = document.createElement('cite');

  /// Creates an [HTMLElement] using the tag 'dfn'.
  HTMLElement.dfn() : _ = document.createElement('dfn');

  /// Creates an [HTMLElement] using the tag 'abbr'.
  HTMLElement.abbr() : _ = document.createElement('abbr');

  /// Creates an [HTMLElement] using the tag 'ruby'.
  HTMLElement.ruby() : _ = document.createElement('ruby');

  /// Creates an [HTMLElement] using the tag 'rt'.
  HTMLElement.rt() : _ = document.createElement('rt');

  /// Creates an [HTMLElement] using the tag 'rp'.
  HTMLElement.rp() : _ = document.createElement('rp');

  /// Creates an [HTMLElement] using the tag 'code'.
  HTMLElement.code() : _ = document.createElement('code');

  /// Creates an [HTMLElement] using the tag 'var'.
  HTMLElement.var_() : _ = document.createElement('var');

  /// Creates an [HTMLElement] using the tag 'samp'.
  HTMLElement.samp() : _ = document.createElement('samp');

  /// Creates an [HTMLElement] using the tag 'kbd'.
  HTMLElement.kbd() : _ = document.createElement('kbd');

  /// Creates an [HTMLElement] using the tag 'sub'.
  HTMLElement.sub() : _ = document.createElement('sub');

  /// Creates an [HTMLElement] using the tag 'sup'.
  HTMLElement.sup() : _ = document.createElement('sup');

  /// Creates an [HTMLElement] using the tag 'i'.
  HTMLElement.i() : _ = document.createElement('i');

  /// Creates an [HTMLElement] using the tag 'b'.
  HTMLElement.b() : _ = document.createElement('b');

  /// Creates an [HTMLElement] using the tag 'u'.
  HTMLElement.u() : _ = document.createElement('u');

  /// Creates an [HTMLElement] using the tag 'mark'.
  HTMLElement.mark() : _ = document.createElement('mark');

  /// Creates an [HTMLElement] using the tag 'bdi'.
  HTMLElement.bdi() : _ = document.createElement('bdi');

  /// Creates an [HTMLElement] using the tag 'bdo'.
  HTMLElement.bdo() : _ = document.createElement('bdo');

  /// Creates an [HTMLElement] using the tag 'wbr'.
  HTMLElement.wbr() : _ = document.createElement('wbr');

  /// Creates an [HTMLElement] using the tag 'summary'.
  HTMLElement.summary() : _ = document.createElement('summary');

  /// Creates an [HTMLElement] using the tag 'noscript'.
  HTMLElement.noscript() : _ = document.createElement('noscript');

  /// Creates an [HTMLElement] using the tag 'acronym'.
  HTMLElement.acronym() : _ = document.createElement('acronym');

  /// Creates an [HTMLElement] using the tag 'noframes'.
  HTMLElement.noframes() : _ = document.createElement('noframes');

  /// Creates an [HTMLElement] using the tag 'menuitem'.
  HTMLElement.menuitem() : _ = document.createElement('menuitem');

  /// Creates an [HTMLElement] using the tag 'noembed'.
  HTMLElement.noembed() : _ = document.createElement('noembed');

  /// Creates an [HTMLElement] using the tag 'plaintext'.
  HTMLElement.plaintext() : _ = document.createElement('plaintext');

  /// Creates an [HTMLElement] using the tag 'rb'.
  HTMLElement.rb() : _ = document.createElement('rb');

  /// Creates an [HTMLElement] using the tag 'rtc'.
  HTMLElement.rtc() : _ = document.createElement('rtc');

  /// Creates an [HTMLElement] using the tag 'strike'.
  HTMLElement.strike() : _ = document.createElement('strike');

  /// Creates an [HTMLElement] using the tag 'basefont'.
  HTMLElement.basefont() : _ = document.createElement('basefont');

  /// Creates an [HTMLElement] using the tag 'big'.
  HTMLElement.big() : _ = document.createElement('big');

  /// Creates an [HTMLElement] using the tag 'center'.
  HTMLElement.center() : _ = document.createElement('center');

  /// Creates an [HTMLElement] using the tag 'nobr'.
  HTMLElement.nobr() : _ = document.createElement('nobr');

  /// Creates an [HTMLElement] using the tag 'tt'.
  HTMLElement.tt() : _ = document.createElement('tt');

  /// The **`HTMLElement.click()`** method simulates a mouse click on an
  /// element. When called on an element, the element's [Element.click_event]
  /// event is fired (unless its
  /// [`disabled`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/disabled)
  /// attribute is set).
  external void click();

  /// The **`HTMLElement.attachInternals()`** method returns an
  /// [ElementInternals] object.
  /// This method allows a
  /// [custom element](https://developer.mozilla.org/en-US/docs/Web/API/Web_components/Using_custom_elements)
  /// to participate in HTML forms. The `ElementInternals` interface provides
  /// utilities for working with these elements in the same way you would work
  /// with any standard HTML form element, and also exposes the
  /// [Accessibility Object Model](https://wicg.github.io/aom/explainer.html) to
  /// the element.
  external ElementInternals attachInternals();

  /// The **`showPopover()`** method of the [HTMLElement] interface shows a
  /// [Popover_API] element (i.e. one that has a valid
  /// [`popover`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/popover)
  /// attribute) by adding it to the .
  ///
  /// When `showPopover()` is called on an element with the
  /// [`popover`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/popover)
  /// attribute that is currently hidden, a [HTMLElement.beforetoggle_event]
  /// event will be fired, followed by the popover showing, and then the
  /// [HTMLElement.toggle_event] event firing. If the element is already
  /// showing, an error will be thrown.
  external void showPopover();

  /// The **`hidePopover()`** method of the [HTMLElement] interface hides a
  /// [popover](https://developer.mozilla.org/en-US/docs/Web/API/Popover_API)
  /// element (i.e. one that has a valid
  /// [`popover`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/popover)
  /// attribute) by removing it from the  and styling it with `display: none`.
  ///
  /// When `hidePopover()` is called on a showing element with the
  /// [`popover`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/popover)
  /// attribute, a [HTMLElement.beforetoggle_event] event will be fired,
  /// followed by the popover being hidden, and then the
  /// [HTMLElement.toggle_event] event firing. If the element is already hidden,
  /// an error is thrown.
  external void hidePopover();

  /// The **`togglePopover()`** method of the [HTMLElement] interface toggles a
  /// [Popover_API] element (i.e. one that has a valid
  /// [`popover`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/popover)
  /// attribute) between the hidden and showing states.
  ///
  /// When `togglePopover()` is called on an element with the
  /// [`popover`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/popover)
  /// attribute:
  ///
  /// 1. A [HTMLElement.beforetoggle_event] event is fired.
  /// 2. The popover toggles between hidden and showing:
  /// 1. If it was initially showing, it toggles to hidden.
  /// 2. If it was initially hidden, it toggles to showing.
  /// 3. A [HTMLElement.toggle_event] event is fired.
  external bool togglePopover([bool force]);

  /// The **`HTMLElement.focus()`** method sets focus on the specified element,
  /// if it can be focused.
  /// The focused element is the element that will receive keyboard and similar
  /// events by default.
  ///
  /// By default the browser will scroll the element into view after focusing
  /// it, and it may also provide visible indication of the focused element
  /// (typically by displaying a "focus ring" around the element).
  /// Parameter options are provided to disable the default scrolling and force
  /// visible indication on elements.
  external void focus([FocusOptions options]);

  /// The **`HTMLElement.blur()`** method removes keyboard focus from the
  /// current element.
  external void blur();

  /// The **`HTMLElement.title`** property
  /// represents the title of the element: the text usually displayed in a
  /// 'tooltip' popup
  /// when the mouse is over the node.
  external String get title;
  external set title(String value);

  /// The **`HTMLElement.lang`** property gets or sets the base
  /// language of an element's attribute values and text content.
  ///
  /// The language code returned by this property is defined in `5646, "Tags for
  /// Identifying Languages (also known as BCP 47)"`.
  /// Common examples include "en" for English, "ja" for
  /// Japanese, "es" for Spanish and so on. The default value of this attribute
  /// is
  /// `unknown`. Note that this attribute, though valid at the individual
  /// element
  /// level described here, is most often specified for the root element of the
  /// document.
  ///
  /// This also only works with the `lang` attribute and not with
  /// `xml:lang`.
  external String get lang;
  external set lang(String value);

  /// The **`translate`** property of the [HTMLElement] interface indicates
  /// whether an element's attribute values and the values of its [Text] node
  /// children are to be translated when the page is localized, or whether to
  /// leave them unchanged.
  ///
  /// It reflects the value of the
  /// [`translate`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/translate)
  /// HTML global attribute.
  external bool get translate;
  external set translate(bool value);

  /// The **`HTMLElement.dir`** property gets or sets the text
  /// writing directionality of the content of the current element.
  ///
  /// The text writing directionality of an element is which direction that text
  /// goes (for
  /// support of different language systems). Arabic languages and Hebrew are
  /// typical
  /// languages using the RTL directionality.
  ///
  /// An image can have its `dir` property set to "`rtl`" in which case
  /// the HTML attributes `title` and `alt` will be formatted and
  /// defined as "`rtl`".
  ///
  /// When a table has its `dir` set to "`rtl`", the column order is
  /// arranged from right to left.
  ///
  /// When an element has its dir set to "`auto`", the direction of the element
  /// is
  /// determined based on its first strong directionality character, or default
  /// to the
  /// directionality of its parent element.
  ///
  /// > **Note:** Browsers might allow users to change the directionality of
  /// > `input`
  /// > and `textarea`s in order to assist with authoring content. Chrome
  /// > and Safari provide a directionality option in the contextual menu of
  /// > input fields
  /// > while pre-Chromium Edge uses the key combinations <kbd>Ctrl</kbd> +
  /// > <kbd>Left Shift</kbd> and <kbd>Ctrl</kbd> + <kbd>Right Shift</kbd>.
  /// > Firefox uses <kbd>Ctrl</kbd>/<kbd>Cmd</kbd> + <kbd>Shift</kbd> +
  /// > <kbd>X</kbd> but does NOT update
  /// > the **`dir`** attribute value.
  external String get dir;
  external set dir(String value);

  /// The [HTMLElement] property **`hidden`** reflects the value of the
  /// element's
  /// [`hidden`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/hidden)
  /// attribute.
  external JSAny? get hidden;
  external set hidden(JSAny? value);

  /// The [HTMLElement] property **`inert`** reflects the value of the element's
  /// [`inert`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/inert)
  /// attribute. It is a boolean value that, when present, makes the browser
  /// "ignore" user input events for the element, including focus events and
  /// events from assistive technologies. The browser may also ignore page
  /// search and text selection in the element. This can be useful when building
  /// UIs such as modals where you would want to "trap" the focus inside the
  /// modal when it's visible.
  ///
  /// > **Note:** Do not nest interactive elements or important content within
  /// > elements with the `inert` attribute as inert content and their
  /// > descendants are neither focusable nor perceivable by all users.
  external bool get inert;
  external set inert(bool value);

  /// The **`HTMLElement.accessKey`** property sets the keystroke which a user
  /// can press to jump to a given element.
  ///
  /// > **Note:** The `HTMLElement.accessKey` property is seldom used because of
  /// > its multiple conflicts with already present key bindings in browsers. To
  /// > work around this, browsers implement accesskey behavior if the keys are
  /// > pressed with other "qualifying" keys (such as <kbd>Alt</kbd> +
  /// > accesskey).
  external String get accessKey;
  external set accessKey(String value);

  /// The **`HTMLElement.accessKeyLabel`**
  /// read-only property returns a string containing the element's
  /// browser-assigned access key (if any); otherwise it returns an empty
  /// string.
  external String get accessKeyLabel;

  /// The **`draggable`** property of the [HTMLElement] interface gets and sets
  /// a `Boolean` primitive indicating if the element is draggable.
  ///
  /// It reflects the value of the
  /// [`draggable`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/draggable)
  /// HTML global attribute.
  external bool get draggable;
  external set draggable(bool value);

  /// The **`spellcheck`** property of the [HTMLElement] interface represents a
  /// boolean value that controls the
  /// [spell-checking](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/spellcheck)
  /// hint. It is available on all HTML elements, though it doesn't affect all
  /// of them.
  ///
  /// It reflects the value of the
  /// [`spellcheck`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/spellcheck)
  /// HTML global attribute.
  external bool get spellcheck;
  external set spellcheck(bool value);

  /// The **`autocapitalize`** property of the [HTMLElement] interface
  /// represents the element's capitalization behavior for user input. It is
  /// available on all HTML elements, though it doesn't affect all of them,
  /// including:
  ///
  /// - `input` and `textarea` elements.
  /// - Any element with
  ///   [`contenteditable`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/contenteditable)
  ///   set on it.
  ///
  /// `autocapitalize` doesn't affect behavior when typing on a physical
  /// keyboard. It affects the behavior of other input mechanisms such as
  /// virtual keyboards on mobile devices and voice input. This can assist users
  /// by making data entry quicker and easier, for example by automatically
  /// capitalizing the first letter of each sentence.
  ///
  /// It reflects the value of the
  /// [`autocapitalize`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/autocapitalize)
  /// HTML global attribute.
  external String get autocapitalize;
  external set autocapitalize(String value);

  /// The **`innerText`** property of the [HTMLElement] interface represents the
  /// rendered text content of a node and its descendants.
  ///
  /// As a getter, it approximates the text the user would get if they
  /// highlighted the contents of the element with the cursor and then copied it
  /// to the clipboard.
  /// As a setter this will replace the element's children with the given value,
  /// converting any line breaks into `br` elements.
  ///
  /// > **Note:** `innerText` is easily confused with [Node.textContent], but
  /// > there are important differences between the two.
  /// > Basically, `innerText` is aware of the rendered appearance of text,
  /// > while `textContent` is not.
  external String get innerText;
  external set innerText(String value);

  /// The **`outerText`** property of the [HTMLElement] interface returns the
  /// same value as [HTMLElement.innerText].
  /// When used as a setter it replaces the whole current node with the given
  /// text (this differs from `innerText`, which replaces the content _inside_
  /// the current node).
  ///
  /// See [HTMLElement.innerText] for more information and examples showing how
  /// both properties are used as getters.
  external String get outerText;
  external set outerText(String value);

  /// The **`popover`** property of the [HTMLElement] interface gets and sets an
  /// element's popover state via JavaScript (`"auto"` or `"manual"`), and can
  /// be used for feature detection.
  ///
  /// It reflects the value of the
  /// [`popover`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/popover)
  /// global HTML attribute.
  external String? get popover;
  external set popover(String? value);

  /// The **`HTMLElement.offsetParent`** read-only property returns a
  /// reference to the element which is the closest (nearest in the containment
  /// hierarchy)
  /// positioned ancestor element.
  ///
  /// A positioned ancestor is either:
  ///
  /// - an element with a non-static position, or
  /// - `td`, `th`, `table` in case the element itself is static positioned.
  ///
  /// If there is no positioned ancestor element, the `body` is returned.
  ///
  /// > **Note:** `offsetParent` returns `null` in the following
  /// > situations:
  /// >
  /// > - The element or any ancestor has the `display` property set to
  /// > `none`.
  /// > - The element has the `position` property set to `fixed`
  /// > (Firefox returns `<body>`).
  /// > - The element is `<body>` or `<html>`.
  ///
  /// `offsetParent` is useful because
  /// [HTMLElement.offsetTop] and
  /// [HTMLElement.offsetLeft] are relative to its padding edge.
  external Element? get offsetParent;

  /// The **`HTMLElement.offsetTop`** read-only property returns the
  /// distance from the outer border of the current element (including its
  /// margin) to the top padding edge of the [HTMLelement.offsetParent], the
  /// _closest positioned_
  /// ancestor element.
  external int get offsetTop;

  /// The **`HTMLElement.offsetLeft`** read-only property returns the number of
  /// pixels that the _upper left corner_ of the current element is offset to
  /// the left within the [HTMLElement.offsetParent] node.
  ///
  /// For block-level elements, `offsetTop`, `offsetLeft`, `offsetWidth`, and
  /// `offsetHeight` describe the border box of an element relative to the
  /// `offsetParent`.
  ///
  /// However, for inline-level elements (such as **span**) that can wrap from
  /// one line to the next, `offsetTop` and `offsetLeft` describe the positions
  /// of the _first_ border box (use [Element.getClientRects] to get its width
  /// and height), while `offsetWidth` and `offsetHeight` describe the
  /// dimensions of the _bounding_ border box (use
  /// [Element.getBoundingClientRect] to get its position). Therefore, a box
  /// with the left, top, width and height of `offsetLeft`, `offsetTop`,
  /// `offsetWidth` and `offsetHeight` will not be a bounding box for a span
  /// with wrapped text.
  external int get offsetLeft;

  /// The **`HTMLElement.offsetWidth`** read-only property returns
  /// the layout width of an element as an integer.
  ///
  /// Typically, `offsetWidth` is a measurement in pixels of the element's CSS
  /// width, including any borders, padding, and vertical scrollbars (if
  /// rendered). It does
  /// not include the width of pseudo-elements such as `::before` or
  /// `::after`.
  ///
  /// If the element is hidden (for example, by setting `style.display` on the
  /// element or one of its ancestors to `"none"`), then `0` is
  /// returned.
  external int get offsetWidth;

  /// The **`HTMLElement.offsetHeight`** read-only property returns
  /// the height of an element, including vertical padding and borders, as an
  /// integer.
  ///
  /// Typically, `offsetHeight` is a measurement in pixels of the element's CSS
  /// height, including any borders, padding, and horizontal scrollbars (if
  /// rendered). It does
  /// not include the height of pseudo-elements such as `::before` or
  /// `::after`. For the document body object, the measurement includes total
  /// linear content height instead of the element's CSS height. Floated
  /// elements extending
  /// below other linear content are ignored.
  ///
  /// If the element is hidden (for example, by setting `style.display` on the
  /// element or one of its ancestors to `"none"`), then `0` is
  /// returned.
  ///
  /// > **Note:** This property will round the value to an integer. If you need
  /// > a fractional value, use
  /// > [element.getBoundingClientRect].
  external int get offsetHeight;

  /// The read-only **`style`** property of the [HTMLElement] returns the
  /// _inline_ style of an element in the form of a live [CSSStyleDeclaration]
  /// object that contains a list of all styles properties for that element with
  /// values assigned only for the attributes that are defined in the element's
  /// inline
  /// [`style`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/style)
  /// attribute.
  ///
  /// Shorthand properties are expanded. If you set `style="border-top: 1px
  /// solid black"`, the longhand properties (, , and ) are set instead.
  ///
  /// This property is read-only, meaning it is not possible to assign a
  /// [CSSStyleDeclaration] object to it. Nevertheless, it is possible to set an
  /// inline style by assigning a _string_ directly to the `style` property. In
  /// this case the string is forwarded to [CSSStyleDeclaration.cssText]. Using
  /// `style` in this manner will completely overwrite all inline styles on the
  /// element.
  ///
  /// Therefore, to add specific styles to an element without altering other
  /// style values, it is generally preferable to set individual properties on
  /// the [CSSStyleDeclaration] object. For example, you can write
  /// `element.style.backgroundColor = "red"`.
  ///
  /// A style declaration is reset by setting it to `null` or an empty string,
  /// e.g., `elt.style.color = null`.
  ///
  /// > **Note:** CSS property names are converted to JavaScript identifier with
  /// > these rules:
  /// >
  /// > - If the property is made of one word, it remains as it is: `height`
  /// > stays as is (in lowercase). As `float` is a reserved keyword in
  /// > JavaScript, this property name was historically converted to `cssFloat`.
  /// > All modern browsers now support the direct use of `float` in JavaScript
  /// > to access the `float` CSS property, but `cssFloat` is used in older
  /// > browsers and is still supported as an alias in modern browsers.
  /// > - If the property is made of several words, separated by dashes, the
  /// > dashes are removed and it is converted to : `background-attachment`
  /// > becomes `backgroundAttachment`.
  /// >
  /// > The `style` property has the same priority in the CSS cascade as an
  /// > inline style declaration set via the `style` attribute.
  external CSSStyleDeclaration get style;

  /// The **`attributeStyleMap`** read-only property of the [HTMLElement]
  /// interface returns a live [StylePropertyMap] object that contains a list of
  /// style properties of the element that are defined in the element's inline
  /// `style` attribute, or assigned using the [HTMLElement.style] property of
  /// the [HTMLElement] interface via script.
  ///
  /// Shorthand properties are expanded. If you set `border-top: 1px solid
  /// black`, the longhand properties (, , and ) are set instead.
  ///
  /// The main difference between [HTMLElement.style] property and
  /// `attributeStyleMap` property is that, the `style` property will return a
  /// [CSSStyleDeclaration] object, while the `attributeStyleMap` property will
  /// return a [StylePropertyMap] object.
  ///
  /// Though the property itself is not writable, you could read and write
  /// inline styles through the [StylePropertyMap] object that it returns, just
  /// like through the [CSSStyleDeclaration] object that returns via the `style`
  /// property.
  external StylePropertyMap get attributeStyleMap;
  external EventHandler get onabort;
  external set onabort(EventHandler value);
  external EventHandler get onauxclick;
  external set onauxclick(EventHandler value);
  external EventHandler get onbeforeinput;
  external set onbeforeinput(EventHandler value);
  external EventHandler get onbeforetoggle;
  external set onbeforetoggle(EventHandler value);
  external EventHandler get onblur;
  external set onblur(EventHandler value);
  external EventHandler get oncancel;
  external set oncancel(EventHandler value);
  external EventHandler get oncanplay;
  external set oncanplay(EventHandler value);
  external EventHandler get oncanplaythrough;
  external set oncanplaythrough(EventHandler value);
  external EventHandler get onchange;
  external set onchange(EventHandler value);
  external EventHandler get onclick;
  external set onclick(EventHandler value);
  external EventHandler get onclose;
  external set onclose(EventHandler value);
  external EventHandler get oncontextlost;
  external set oncontextlost(EventHandler value);
  external EventHandler get oncontextmenu;
  external set oncontextmenu(EventHandler value);
  external EventHandler get oncontextrestored;
  external set oncontextrestored(EventHandler value);
  external EventHandler get oncopy;
  external set oncopy(EventHandler value);
  external EventHandler get oncuechange;
  external set oncuechange(EventHandler value);
  external EventHandler get oncut;
  external set oncut(EventHandler value);
  external EventHandler get ondblclick;
  external set ondblclick(EventHandler value);
  external EventHandler get ondrag;
  external set ondrag(EventHandler value);
  external EventHandler get ondragend;
  external set ondragend(EventHandler value);
  external EventHandler get ondragenter;
  external set ondragenter(EventHandler value);
  external EventHandler get ondragleave;
  external set ondragleave(EventHandler value);
  external EventHandler get ondragover;
  external set ondragover(EventHandler value);
  external EventHandler get ondragstart;
  external set ondragstart(EventHandler value);
  external EventHandler get ondrop;
  external set ondrop(EventHandler value);
  external EventHandler get ondurationchange;
  external set ondurationchange(EventHandler value);
  external EventHandler get onemptied;
  external set onemptied(EventHandler value);
  external EventHandler get onended;
  external set onended(EventHandler value);
  external OnErrorEventHandler get onerror;
  external set onerror(OnErrorEventHandler value);
  external EventHandler get onfocus;
  external set onfocus(EventHandler value);
  external EventHandler get onformdata;
  external set onformdata(EventHandler value);
  external EventHandler get oninput;
  external set oninput(EventHandler value);
  external EventHandler get oninvalid;
  external set oninvalid(EventHandler value);
  external EventHandler get onkeydown;
  external set onkeydown(EventHandler value);
  external EventHandler get onkeypress;
  external set onkeypress(EventHandler value);
  external EventHandler get onkeyup;
  external set onkeyup(EventHandler value);
  external EventHandler get onload;
  external set onload(EventHandler value);
  external EventHandler get onloadeddata;
  external set onloadeddata(EventHandler value);
  external EventHandler get onloadedmetadata;
  external set onloadedmetadata(EventHandler value);
  external EventHandler get onloadstart;
  external set onloadstart(EventHandler value);
  external EventHandler get onmousedown;
  external set onmousedown(EventHandler value);
  external EventHandler get onmouseenter;
  external set onmouseenter(EventHandler value);
  external EventHandler get onmouseleave;
  external set onmouseleave(EventHandler value);
  external EventHandler get onmousemove;
  external set onmousemove(EventHandler value);
  external EventHandler get onmouseout;
  external set onmouseout(EventHandler value);
  external EventHandler get onmouseover;
  external set onmouseover(EventHandler value);
  external EventHandler get onmouseup;
  external set onmouseup(EventHandler value);
  external EventHandler get onpaste;
  external set onpaste(EventHandler value);
  external EventHandler get onpause;
  external set onpause(EventHandler value);
  external EventHandler get onplay;
  external set onplay(EventHandler value);
  external EventHandler get onplaying;
  external set onplaying(EventHandler value);
  external EventHandler get onprogress;
  external set onprogress(EventHandler value);
  external EventHandler get onratechange;
  external set onratechange(EventHandler value);
  external EventHandler get onreset;
  external set onreset(EventHandler value);
  external EventHandler get onresize;
  external set onresize(EventHandler value);
  external EventHandler get onscroll;
  external set onscroll(EventHandler value);
  external EventHandler get onscrollend;
  external set onscrollend(EventHandler value);
  external EventHandler get onsecuritypolicyviolation;
  external set onsecuritypolicyviolation(EventHandler value);
  external EventHandler get onseeked;
  external set onseeked(EventHandler value);
  external EventHandler get onseeking;
  external set onseeking(EventHandler value);
  external EventHandler get onselect;
  external set onselect(EventHandler value);
  external EventHandler get onslotchange;
  external set onslotchange(EventHandler value);
  external EventHandler get onstalled;
  external set onstalled(EventHandler value);
  external EventHandler get onsubmit;
  external set onsubmit(EventHandler value);
  external EventHandler get onsuspend;
  external set onsuspend(EventHandler value);
  external EventHandler get ontimeupdate;
  external set ontimeupdate(EventHandler value);
  external EventHandler get ontoggle;
  external set ontoggle(EventHandler value);
  external EventHandler get onvolumechange;
  external set onvolumechange(EventHandler value);
  external EventHandler get onwaiting;
  external set onwaiting(EventHandler value);
  external EventHandler get onwheel;
  external set onwheel(EventHandler value);
  external EventHandler get onanimationstart;
  external set onanimationstart(EventHandler value);
  external EventHandler get onanimationiteration;
  external set onanimationiteration(EventHandler value);
  external EventHandler get onanimationend;
  external set onanimationend(EventHandler value);
  external EventHandler get onanimationcancel;
  external set onanimationcancel(EventHandler value);
  external EventHandler get ontransitionrun;
  external set ontransitionrun(EventHandler value);
  external EventHandler get ontransitionstart;
  external set ontransitionstart(EventHandler value);
  external EventHandler get ontransitionend;
  external set ontransitionend(EventHandler value);
  external EventHandler get ontransitioncancel;
  external set ontransitioncancel(EventHandler value);
  external EventHandler get onpointerover;
  external set onpointerover(EventHandler value);
  external EventHandler get onpointerenter;
  external set onpointerenter(EventHandler value);
  external EventHandler get onpointerdown;
  external set onpointerdown(EventHandler value);
  external EventHandler get onpointermove;
  external set onpointermove(EventHandler value);
  external EventHandler get onpointerup;
  external set onpointerup(EventHandler value);
  external EventHandler get onpointercancel;
  external set onpointercancel(EventHandler value);
  external EventHandler get onpointerout;
  external set onpointerout(EventHandler value);
  external EventHandler get onpointerleave;
  external set onpointerleave(EventHandler value);
  external EventHandler get ongotpointercapture;
  external set ongotpointercapture(EventHandler value);
  external EventHandler get onlostpointercapture;
  external set onlostpointercapture(EventHandler value);
  external EventHandler get onselectstart;
  external set onselectstart(EventHandler value);
  external EventHandler get onselectionchange;
  external set onselectionchange(EventHandler value);
  external EventHandler get ontouchstart;
  external set ontouchstart(EventHandler value);
  external EventHandler get ontouchend;
  external set ontouchend(EventHandler value);
  external EventHandler get ontouchmove;
  external set ontouchmove(EventHandler value);
  external EventHandler get ontouchcancel;
  external set ontouchcancel(EventHandler value);

  /// The **`contentEditable`** property of
  /// the [HTMLElement] interface specifies whether or not the element is
  /// editable.
  ///
  /// This enumerated attribute can have the following values:
  ///
  /// - '`true`' indicates that the element is `contenteditable`.
  /// - '`false`' indicates that the element cannot be edited.
  /// - '`plaintext-only`' indicates that the element's raw text is editable,
  ///   but rich text formatting is disabled.
  ///
  /// You can use the [HTMLElement.isContentEditable] property to test the
  /// computed boolean value of this property.
  ///
  /// If the attribute is missing or its value is invalid, its value is
  /// inherited from its parent element: so the element
  /// is editable (or not) based on the parent element.
  external String get contentEditable;
  external set contentEditable(String value);

  /// The **`enterKeyHint`** property is an enumerated property defining
  /// what action label (or icon) to present for the enter key on virtual
  /// keyboards.
  /// It reflects the
  /// [`enterkeyhint`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/enterkeyhint)
  /// HTML global attribute and is an enumerated property, only accepting the
  /// following values
  /// as a string:
  ///
  /// - `'enter'` typically indicating inserting a new line.
  /// - `'done'` typically meaning there is nothing more to input and the input
  ///   method editor (IME) will be closed.
  /// - `'go'` typically meaning to take the user to the target of the text they
  ///   typed.
  /// - `'next'` typically taking the user to the next field that will accept
  ///   text.
  /// - `'previous'` typically taking the user to the previous field that will
  ///   accept text.
  /// - `'search'` typically taking the user to the results of searching for the
  ///   text they have typed.
  /// - `'send'` typically delivering the text to its target.
  ///
  /// If no `enterKeyHint` value has been specified or if it was set to a
  /// different value than the allowed ones, it will return an empty string.
  external String get enterKeyHint;
  external set enterKeyHint(String value);

  /// The **`HTMLElement.isContentEditable`** read-only property
  /// returns a boolean value that is `true` if the contents of the element
  /// are editable; otherwise it returns `false`.
  external bool get isContentEditable;

  /// The [HTMLElement] property **`inputMode`** reflects the value of the
  /// element's
  /// [`inputmode`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/inputmode)
  /// attribute.
  ///
  /// It provides a hint about the type of data that might be entered by the
  /// user while editing the element or its contents. This allows the browser to
  /// display an appropriate virtual keyboard.
  ///
  /// It is used primarily on `input` elements, but is usable on any element in
  /// [`contenteditable`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes#contenteditable)
  /// mode.
  external String get inputMode;
  external set inputMode(String value);

  /// The **`dataset`** read-only property
  /// of the [HTMLElement] interface provides read/write access to
  /// [custom data attributes](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/data-*)
  /// (`data-*`) on elements. It exposes a map of strings
  /// ([DOMStringMap]) with an entry for each `data-*` attribute.
  ///
  /// > **Note:** The `dataset` property itself can be read, but not directly
  /// > written.
  /// > Instead, all writes must be to the individual properties within the
  /// > `dataset`, which in turn represent the data attributes.
  ///
  /// An HTML `data-*` attribute and its corresponding DOM
  /// `dataset.property` modify their shared name according to where
  /// they are read or written:
  ///
  /// - In HTML
  ///   - : The attribute name begins with `data-`. It can contain only letters,
  /// numbers, dashes (`-`), periods (`.`), colons (`:`),
  /// and underscores (`_`). Any  capital letters (`A` to
  /// `Z`) are converted to lowercase.
  /// - In JavaScript
  ///   - : The property name of a custom data attribute is the same as the HTML attribute
  /// without the `data-` prefix, and removes single dashes (`-`) for
  /// when to capitalize the property's "" name.
  ///
  /// In addition to the information below, you'll find a how-to guide for using
  /// HTML data
  /// attributes in our article
  /// [_Using data attributes_](https://developer.mozilla.org/en-US/docs/Learn/HTML/Howto/Use_data_attributes).
  ///
  /// ### Name conversion
  ///
  /// - `dash-style` to `camelCase` conversion
  ///
  ///   - : A custom data attribute name is transformed to a key for the
  /// [DOMStringMap] entry by the following:
  ///
  /// 1. Lowercase all ASCII capital letters (`A` to
  /// `Z`);
  /// 2. Remove the prefix `data-` (including the dash);
  /// 3. For any dash (`U+002D`) followed by an ASCII lowercase letter
  /// `a` to `z`, remove the dash and uppercase the letter;
  /// 4. Other characters (including other dashes) are left unchanged.
  ///
  /// - `camelCase` to `dash-style` conversion
  ///
  ///   - : The opposite transformation, which maps a key to an attribute name, uses the
  /// following:
  ///
  /// 1. **Restriction:** Before transformation, a dash _must not_ be
  /// immediately followed by an ASCII lowercase letter `a` to
  /// `z`;
  /// 2. Add the `data-` prefix;
  /// 3. Add a dash before any ASCII uppercase letter `A` to `Z`,
  /// then lowercase the letter;
  /// 4. Other characters are left unchanged.
  ///
  /// For example, a `data-abc-def` attribute corresponds to
  /// `dataset.abcDef`.
  ///
  /// ### Accessing values
  ///
  /// - Attributes can be set and read by the camelCase name/key as an object
  ///   property of
  /// the dataset: `element.dataset.keyname`.
  /// - Attributes can also be set and read using bracket syntax:
  /// `element.dataset['keyname']`.
  /// - The
  ///   [`in` operator](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/in)
  ///   can check if a given attribute exists:
  /// `'keyname' in element.dataset`. Note that this will walk the
  /// [prototype chain](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Inheritance_and_the_prototype_chain)
  /// of `dataset` and may be unsafe if you have external code that may pollute
  /// the prototype chain. Several alternatives exist, such as `'keyname')"`, or
  /// just checking if `element.dataset.keyname !== undefined`.
  ///
  /// ### Setting values
  ///
  /// - When the attribute is set, its value is always converted to a string.
  /// For example: `element.dataset.example = null` is
  /// converted into `data-example="null"`.
  ///
  /// - To remove an attribute, you can use the
  ///   [`delete` operator](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/delete):
  ///   `delete element.dataset.keyname`.
  external DOMStringMap get dataset;

  /// The **`nonce`** property of the [HTMLElement] interface returns the
  /// cryptographic number used once that is used by
  /// [Content Security Policy](https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP)
  /// to determine whether a given fetch will be allowed to proceed.
  ///
  /// In later implementations, elements only expose their `nonce` attribute to
  /// scripts (and not to side-channels like CSS attribute selectors).
  external String get nonce;
  external set nonce(String value);

  /// The **`autofocus`** property of the [HTMLElement] interface represents a
  /// boolean value reflecting the
  /// [`autofocus`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/select#autofocus)
  /// HTML global attribute, which indicates whether the control should be
  /// focused when the page loads, or when dialog or popover become shown if
  /// specified in an element inside `dialog` elements or elements whose popover
  /// attribute is set.
  ///
  /// Only one form-associated element inside a document, or a `dialog` element,
  /// or an element whose `popover` attribute is set, can have this attribute
  /// specified. If there are several, the first element with the attribute set
  /// inserted, usually the first such element on the page, gets the initial
  /// focus.
  ///
  /// > **Note:** Setting this property doesn't set the focus to the associated
  /// > element: it merely tells the browser to focus to it when _the element is
  /// > inserted_ in the document. Setting it after the insertion, that is most
  /// > of the time after the document load, has no visible effect.
  external bool get autofocus;
  external set autofocus(bool value);

  /// The **`tabIndex`** property of the
  /// [HTMLElement] interface represents the tab order of the current element.
  ///
  /// Tab order is as follows:
  ///
  /// 1. Elements with a positive `tabIndex`. Elements that have identical
  /// `tabIndex` values should be navigated in the order they appear. Navigation
  /// proceeds from the lowest `tabIndex` to the highest `tabIndex`.
  /// 2. Elements that do not support the `tabIndex` attribute or support it and
  /// assign `tabIndex` to `0`, in the order they appear.
  ///
  /// Elements that are disabled do not participate in the tabbing order.
  ///
  /// Values don't need to be sequential, nor must they begin with any
  /// particular value. They
  /// may even be negative, though each browser trims very large values.
  external int get tabIndex;
  external set tabIndex(int value);
}

/// The **`HTMLUnknownElement`** interface represents an invalid HTML element
/// and derives from the [HTMLElement] interface, but without implementing any
/// additional properties or methods.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLUnknownElement).
extension type HTMLUnknownElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLUnknownElement] using the tag 'applet'.
  HTMLUnknownElement.applet() : _ = document.createElement('applet');

  /// Creates an [HTMLUnknownElement] using the tag 'bgsound'.
  HTMLUnknownElement.bgsound() : _ = document.createElement('bgsound');

  /// Creates an [HTMLUnknownElement] using the tag 'isindex'.
  HTMLUnknownElement.isindex() : _ = document.createElement('isindex');

  /// Creates an [HTMLUnknownElement] using the tag 'keygen'.
  HTMLUnknownElement.keygen() : _ = document.createElement('keygen');

  /// Creates an [HTMLUnknownElement] using the tag 'nextid'.
  HTMLUnknownElement.nextid() : _ = document.createElement('nextid');

  /// Creates an [HTMLUnknownElement] using the tag 'blink'.
  HTMLUnknownElement.blink() : _ = document.createElement('blink');

  /// Creates an [HTMLUnknownElement] using the tag 'multicol'.
  HTMLUnknownElement.multicol() : _ = document.createElement('multicol');

  /// Creates an [HTMLUnknownElement] using the tag 'spacer'.
  HTMLUnknownElement.spacer() : _ = document.createElement('spacer');
}

/// The **`DOMStringMap`** interface is used for the [HTMLElement.dataset]
/// attribute, to represent data for custom attributes added to elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/DOMStringMap).
extension type DOMStringMap._(JSObject _) implements JSObject {
  external String operator [](String name);
  external void operator []=(
    String name,
    String value,
  );
}

/// The **`HTMLHtmlElement`** interface serves as the root node for a given HTML
/// document. This object inherits the properties and methods described in the
/// [HTMLElement] interface.
///
/// You can retrieve the `HTMLHtmlElement` object for a given document by
/// reading the value of the [document.documentElement] property.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLHtmlElement).
extension type HTMLHtmlElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLHtmlElement] using the tag 'html'.
  HTMLHtmlElement() : _ = document.createElement('html');

  /// > **Note:** This property has been declared as deprecated by the W3C
  /// > technical recommendation for HTML 4.01 in favor of use of the DTD for
  /// > obtaining version information for a document.
  ///
  /// Returns version information about the document type definition (DTD) of a
  /// document. While this property is recognized by Mozilla, the return value
  /// for this property is always an empty string.
  external String get version;
  external set version(String value);
}

/// The **`HTMLHeadElement`** interface contains the descriptive information, or
/// metadata, for a document. This object inherits all of the properties and
/// methods described in the [HTMLElement] interface.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLHeadElement).
extension type HTMLHeadElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLHeadElement] using the tag 'head'.
  HTMLHeadElement() : _ = document.createElement('head');
}

/// The **`HTMLTitleElement`** interface is implemented by a document's `title`.
/// This element inherits all of the properties and methods of the [HTMLElement]
/// interface.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLTitleElement).
extension type HTMLTitleElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLTitleElement] using the tag 'title'.
  HTMLTitleElement() : _ = document.createElement('title');

  /// The **`text`** property of the [HTMLTitleElement] interface represents the
  /// text of the document's title. Only the text part is included; tags within
  /// the element and their content are stripped and ignored.
  external String get text;
  external set text(String value);
}

/// The **`HTMLBaseElement`** interface contains the base URI for a document.
/// This object inherits all of the properties and methods as described in the
/// [HTMLElement] interface.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLBaseElement).
extension type HTMLBaseElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLBaseElement] using the tag 'base'.
  HTMLBaseElement() : _ = document.createElement('base');

  external String get href;
  external set href(String value);

  /// The `target` property of the [HTMLBaseElement] interface is a string that
  /// represents the default target tab to show the resulting output for
  /// hyperlinks and form elements.
  ///
  /// It reflects the
  /// [`target`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base#target)
  /// attribute of the `base` element.
  external String get target;
  external set target(String value);
}

/// The **`HTMLLinkElement`** interface represents reference information for
/// external resources and the relationship of those resources to a document and
/// vice versa (corresponds to
/// [`<link>`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/link)
/// element; not to be confused with
/// [`<a>`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/a), which
/// is represented by
/// [`HTMLAnchorElement`](https://developer.mozilla.org/en-US/docs/Web/API/HTMLAnchorElement)).
/// This object inherits all of the properties and methods of the [HTMLElement]
/// interface.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLLinkElement).
extension type HTMLLinkElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLLinkElement] using the tag 'link'.
  HTMLLinkElement() : _ = document.createElement('link');

  external String get href;
  external set href(String value);

  /// The **`crossOrigin`** property of the [HTMLLinkElement] interface
  /// specifies the Cross-Origin Resource Sharing () setting to use when
  /// retrieving the resource.
  external String? get crossOrigin;
  external set crossOrigin(String? value);

  /// The **`rel`** property of the [HTMLLinkElement] interface reflects the
  /// [`rel`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/rel)
  /// attribute. It is a string containing a space-separated list of link types
  /// indicating the relationship between the resource represented by the `link`
  /// element and the current document.
  ///
  /// The most common use of this attribute is to specify a link to an external
  /// style sheet:
  /// the property is set to `stylesheet`, and the
  /// [`href`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/link#href)
  /// attribute is set to the URL of an external style sheet to format the page.
  external String get rel;
  external set rel(String value);

  /// The **`as`** property of the [HTMLLinkElement] interface returns a string
  /// representing the type of content to be preloaded by a link element.
  ///
  /// The `as` property must have a value for link elements when
  /// [`rel="preload"`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/rel/preload),
  /// or the resource will not be fetched.
  /// It may also be applied to link elements where
  /// [`rel="modulepreload"`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/rel/preload),
  /// but if omitted, will default to `script`.
  /// The property should not be set for other types of link elements, such as
  /// `rel="prefetch"`.
  ///
  /// This property reflects the value of the
  /// [`as` attribute](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/link#as)
  /// of the
  /// [`<link>`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/link)
  /// HTML element.
  external String get as;
  external set as(String value);

  /// The **`relList`** read-only property of the [HTMLLinkElement] interface
  /// reflects the
  /// [`rel`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/rel)
  /// attribute. It is a live [DOMTokenList] containing the set of link types
  /// indicating the relationship between the resource represented by the `link`
  /// element and the current document.
  ///
  /// The property itself is read-only, meaning you can not substitute the
  /// [DOMTokenList] by another one, but the content of the returned list can be
  /// changed.
  external DOMTokenList get relList;
  external String get media;
  external set media(String value);

  /// The **`integrity`** property of the [HTMLLinkElement] interface is a
  /// string containing inline metadata that a browser can use to verify that a
  /// fetched resource has been delivered without unexpected manipulation.
  ///
  /// It reflects the `integrity` attribute of the `link` element.
  external String get integrity;
  external set integrity(String value);

  /// The **`hreflang`** property of the [HTMLLinkElement] interface is used to
  /// indicate the language and the geographical targeting of a page. This hint
  /// can be used by browsers to select the more appropriate page or to improve
  /// .
  ///
  /// It reflects the `hreflang` attribute of the `link` element and is the
  /// empty string (`""`) if there is no `hreflang` attribute.
  external String get hreflang;
  external set hreflang(String value);

  /// The **`type`** property of the [HTMLLinkElement] interface is a string
  /// that reflects the  of the linked resource.
  ///
  /// It reflects the `type` attribute of the `link` element.
  external String get type;
  external set type(String value);
  external DOMTokenList get sizes;
  external String get imageSrcset;
  external set imageSrcset(String value);
  external String get imageSizes;
  external set imageSizes(String value);

  /// The **`referrerPolicy`** property of the [HTMLLinkElement] interface
  /// reflects the HTML
  /// [`referrerpolicy`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/link#referrerpolicy)
  /// attribute of the
  /// `link` element defining which referrer is sent when fetching the
  /// resource.
  ///
  /// See the HTTP  header for details.
  external String get referrerPolicy;
  external set referrerPolicy(String value);

  /// The **`disabled`** property of the [HTMLLinkElement] interface is a
  /// boolean value that represents whether the link is disabled. It only has an
  /// effect with style sheet links (`rel` property set to `stylesheet`).
  ///
  /// If `disabled` attribute is specified in the HTML when it is loaded, the
  /// stylesheet will not be loaded during page load. Instead, the stylesheet
  /// will be loaded only when the `disabled` property is set to `false` or
  /// removed. Setting the `disabled` property using JavaScript causes the
  /// stylesheet to be removed from the document's [Document.styleSheets] list.
  ///
  /// It reflects the `disabled` attribute of the `link` element.
  external bool get disabled;
  external set disabled(bool value);

  /// The **`fetchPriority`** property of the
  /// [HTMLLinkElement] interface represents a hint given to the browser
  /// on how it should prioritize the preload of the given resource relative to
  /// other
  /// resources of the same
  /// [type](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/rel/preload#what_types_of_content_can_be_preloaded).
  external String get fetchPriority;
  external set fetchPriority(String value);
  external String get charset;
  external set charset(String value);
  external String get rev;
  external set rev(String value);
  external String get target;
  external set target(String value);

  /// The **`sheet`** read-only property of the [HTMLLinkElement] interface
  /// contains the stylesheet associated with that element.
  ///
  /// A stylesheet is associated to an `HTMLLinkElement` if `rel="stylesheet"`
  /// is used with `<link>`.
  external CSSStyleSheet? get sheet;
}

/// The **`HTMLMetaElement`** interface contains descriptive metadata about a
/// document provided in HTML as
/// [`<meta>`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/meta)
/// elements.
/// This interface inherits all of the properties and methods described in the
/// [HTMLElement] interface.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLMetaElement).
extension type HTMLMetaElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLMetaElement] using the tag 'meta'.
  HTMLMetaElement() : _ = document.createElement('meta');

  /// The **`HTMLMetaElement.name`** property is used in combination with
  /// [HTMLMetaElement.content] to define the name-value pairs for the metadata
  /// of a document.
  /// The `name` attribute defines the metadata name and the `content` attribute
  /// defines the value.
  external String get name;
  external set name(String value);

  /// The **`HTMLMetaElement.httpEquiv`** property gets or sets the pragma
  /// directive or an HTTP response header name for the
  /// [HTMLMetaElement.content] attribute.
  /// For more details on the possible values, see the
  /// [http-equiv](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/meta#http-equiv)
  /// attribute.
  external String get httpEquiv;
  external set httpEquiv(String value);

  /// The **`HTMLMetaElement.content`** property gets or sets the `content`
  /// attribute of pragma directives and named `meta` data in conjunction with
  /// [HTMLMetaElement.name] or [HTMLMetaElement.httpEquiv].
  /// For more information, see the
  /// [content](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/meta#content)
  /// attribute.
  external String get content;
  external set content(String value);

  /// The **`HTMLMetaElement.media`** property enables specifying the media for
  /// `theme-color` metadata.
  ///
  /// The `theme-color` property enables setting the color of the browser's
  /// toolbar or UI in browsers and operating systems that support this
  /// property.
  /// The `media` property enables setting different theme colors for different
  /// `media` values.
  external String get media;
  external set media(String value);

  /// The **`HTMLMetaElement.scheme`** property defines the scheme of the value
  /// in the [HTMLMetaElement.content] attribute.
  /// The `scheme` property was created to enable providing additional
  /// information to be used to interpret the value of the `content` property.
  /// The `scheme` property takes as its value a scheme format (i.e.
  /// `YYYY-MM-DD`) or scheme format name (i.e. `ISBN`), or a URI providing more
  /// information regarding the scheme format. The scheme defines the format of
  /// the value of the `content` attribute.
  /// The `scheme` content is interpreted as an extension of the element's
  /// [HTMLMetaElement.name] if a browser or user agent recognizes the scheme.
  ///
  /// This property is deprecated and should not be used on new web pages.
  external String get scheme;
  external set scheme(String value);
}

/// The **`HTMLStyleElement`** interface represents a `style` element. It
/// inherits properties and methods from its parent, [HTMLElement].
///
/// This interface doesn't allow to manipulate the CSS it contains (in most
/// case). To manipulate CSS, see
/// [Using dynamic styling information](https://developer.mozilla.org/en-US/docs/Web/API/CSS_Object_Model/Using_dynamic_styling_information)
/// for an overview of the objects used to manipulate specified CSS properties
/// using the DOM.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLStyleElement).
extension type HTMLStyleElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLStyleElement] using the tag 'style'.
  HTMLStyleElement() : _ = document.createElement('style');

  /// The **`HTMLStyleElement.disabled`** property can be used to get and set
  /// whether the stylesheet is disabled (`true`) or not (`false`).
  ///
  /// Note that there is no corresponding `disabled` attribute on the [HTML
  /// `<style>`
  /// element](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/style).
  external bool get disabled;
  external set disabled(bool value);

  /// The **`HTMLStyleElement.media`** property specifies the
  /// intended destination medium for style information.
  external String get media;
  external set media(String value);

  /// The **`HTMLStyleElement.type`** property returns the type of the current
  /// style.
  /// The value mirrors the [HTML `<style>` element's `type`
  /// attribute](/en-US/docs/Web/HTML/Element/style#type).
  ///
  /// Authors should not use this property or rely on the value.
  external String get type;
  external set type(String value);

  /// The read-only **`sheet`** property of the [HTMLStyleElement] interface
  /// contains the stylesheet associated with that element.
  ///
  /// An [StyleSheet] is always associated with a [HTMLStyleElement], unless its
  /// `type` attribute is not `text/css`.
  external CSSStyleSheet? get sheet;
}

/// The **`HTMLBodyElement`** interface provides special properties (beyond
/// those inherited from the regular [HTMLElement] interface) for manipulating
/// `body` elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLBodyElement).
extension type HTMLBodyElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLBodyElement] using the tag 'body'.
  HTMLBodyElement() : _ = document.createElement('body');

  external EventHandler get onorientationchange;
  external set onorientationchange(EventHandler value);
  external String get text;
  external set text(String value);
  external String get link;
  external set link(String value);
  external String get vLink;
  external set vLink(String value);
  external String get aLink;
  external set aLink(String value);
  external String get bgColor;
  external set bgColor(String value);
  external String get background;
  external set background(String value);
  external EventHandler get onafterprint;
  external set onafterprint(EventHandler value);
  external EventHandler get onbeforeprint;
  external set onbeforeprint(EventHandler value);
  external OnBeforeUnloadEventHandler get onbeforeunload;
  external set onbeforeunload(OnBeforeUnloadEventHandler value);
  external EventHandler get onhashchange;
  external set onhashchange(EventHandler value);
  external EventHandler get onlanguagechange;
  external set onlanguagechange(EventHandler value);
  external EventHandler get onmessage;
  external set onmessage(EventHandler value);
  external EventHandler get onmessageerror;
  external set onmessageerror(EventHandler value);
  external EventHandler get onoffline;
  external set onoffline(EventHandler value);
  external EventHandler get ononline;
  external set ononline(EventHandler value);
  external EventHandler get onpagehide;
  external set onpagehide(EventHandler value);
  external EventHandler get onpageshow;
  external set onpageshow(EventHandler value);
  external EventHandler get onpopstate;
  external set onpopstate(EventHandler value);
  external EventHandler get onrejectionhandled;
  external set onrejectionhandled(EventHandler value);
  external EventHandler get onstorage;
  external set onstorage(EventHandler value);
  external EventHandler get onunhandledrejection;
  external set onunhandledrejection(EventHandler value);
  external EventHandler get onunload;
  external set onunload(EventHandler value);
  external EventHandler get ongamepadconnected;
  external set ongamepadconnected(EventHandler value);
  external EventHandler get ongamepaddisconnected;
  external set ongamepaddisconnected(EventHandler value);
}

/// The **`HTMLHeadingElement`** interface represents the different heading
/// elements, [`<h1>` through
/// `<h6>`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/Heading_Elements).
/// It inherits methods and properties from the [HTMLElement] interface.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLHeadingElement).
extension type HTMLHeadingElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLHeadingElement] using the tag 'h1'.
  HTMLHeadingElement.h1() : _ = document.createElement('h1');

  /// Creates an [HTMLHeadingElement] using the tag 'h2'.
  HTMLHeadingElement.h2() : _ = document.createElement('h2');

  /// Creates an [HTMLHeadingElement] using the tag 'h3'.
  HTMLHeadingElement.h3() : _ = document.createElement('h3');

  /// Creates an [HTMLHeadingElement] using the tag 'h4'.
  HTMLHeadingElement.h4() : _ = document.createElement('h4');

  /// Creates an [HTMLHeadingElement] using the tag 'h5'.
  HTMLHeadingElement.h5() : _ = document.createElement('h5');

  /// Creates an [HTMLHeadingElement] using the tag 'h6'.
  HTMLHeadingElement.h6() : _ = document.createElement('h6');

  external String get align;
  external set align(String value);
}

/// The **`HTMLParagraphElement`** interface provides special properties (beyond
/// those of the regular [HTMLElement] object interface it inherits) for
/// manipulating `p` elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLParagraphElement).
extension type HTMLParagraphElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLParagraphElement] using the tag 'p'.
  HTMLParagraphElement() : _ = document.createElement('p');

  external String get align;
  external set align(String value);
}

/// The **`HTMLHRElement`** interface provides special properties (beyond those
/// of the [HTMLElement] interface it also has available to it by inheritance)
/// for manipulating `hr` elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLHRElement).
extension type HTMLHRElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLHRElement] using the tag 'hr'.
  HTMLHRElement() : _ = document.createElement('hr');

  external String get align;
  external set align(String value);
  external String get color;
  external set color(String value);
  external bool get noShade;
  external set noShade(bool value);
  external String get size;
  external set size(String value);
  external String get width;
  external set width(String value);
}

/// The **`HTMLPreElement`** interface exposes specific properties and methods
/// (beyond those of the [HTMLElement] interface it also has available to it by
/// inheritance) for manipulating a block of preformatted text (`pre`).
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLPreElement).
extension type HTMLPreElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLPreElement] using the tag 'pre'.
  HTMLPreElement.pre() : _ = document.createElement('pre');

  /// Creates an [HTMLPreElement] using the tag 'listing'.
  HTMLPreElement.listing() : _ = document.createElement('listing');

  /// Creates an [HTMLPreElement] using the tag 'xmp'.
  HTMLPreElement.xmp() : _ = document.createElement('xmp');

  external int get width;
  external set width(int value);
}

/// The **`HTMLQuoteElement`** interface provides special properties and methods
/// (beyond the regular [HTMLElement] interface it also has available to it by
/// inheritance) for manipulating quoting elements, like `blockquote` and `q`,
/// but not the `cite` element.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLQuoteElement).
extension type HTMLQuoteElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLQuoteElement] using the tag 'blockquote'.
  HTMLQuoteElement.blockquote() : _ = document.createElement('blockquote');

  /// Creates an [HTMLQuoteElement] using the tag 'q'.
  HTMLQuoteElement.q() : _ = document.createElement('q');

  external String get cite;
  external set cite(String value);
}

/// The **`HTMLOListElement`** interface provides special properties (beyond
/// those defined on the regular [HTMLElement] interface it also has available
/// to it by inheritance) for manipulating ordered list elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLOListElement).
extension type HTMLOListElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLOListElement] using the tag 'ol'.
  HTMLOListElement() : _ = document.createElement('ol');

  /// The **`reversed`** property of the [HTMLOListElement] interface indicates
  /// order of a list.
  ///
  /// It reflects the
  /// [`reversed`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/ol#reversed)
  /// attribute of the `ol` element.
  external bool get reversed;
  external set reversed(bool value);

  /// The **`start`** property of the [HTMLOListElement] interface indicates
  /// starting value of the ordered list, with default value of 1.
  ///
  /// It reflects the
  /// [`start`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/ol#start)
  /// attribute of the `ol` element.
  ///
  /// > **Note:** The `start` property value is independent of the
  /// > [HTMLOListElement.type] property; it is always numeric, even when type
  /// > is letters or Roman numerals.
  external int get start;
  external set start(int value);

  /// The **`type`** property of the [HTMLOListElement] interface indicates the
  /// kind of marker to be used to display ordered list.
  ///
  /// It reflects the
  /// [`type`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/ol#type)
  /// attribute of the `ol` element.
  ///
  /// > **Note:** The `type` can be defined in CSS with the  property. The
  /// > `list-style-type` property provides many more values.
  external String get type;
  external set type(String value);
  external bool get compact;
  external set compact(bool value);
}

/// The **`HTMLUListElement`** interface provides special properties (beyond
/// those defined on the regular [HTMLElement] interface it also has available
/// to it by inheritance) for manipulating unordered list (`ul`) elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLUListElement).
extension type HTMLUListElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLUListElement] using the tag 'ul'.
  HTMLUListElement() : _ = document.createElement('ul');

  external bool get compact;
  external set compact(bool value);
  external String get type;
  external set type(String value);
}

/// The **`HTMLMenuElement`** interface provides additional properties (beyond
/// those inherited from the [HTMLElement] interface) for manipulating a `menu`
/// element.
/// `<menu>` is a semantic alternative to the `ul` element.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLMenuElement).
extension type HTMLMenuElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLMenuElement] using the tag 'menu'.
  HTMLMenuElement() : _ = document.createElement('menu');

  external bool get compact;
  external set compact(bool value);
}

/// The **`HTMLLIElement`** interface exposes specific properties and methods
/// (beyond those defined by regular [HTMLElement] interface it also has
/// available to it by inheritance) for manipulating list elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLLIElement).
extension type HTMLLIElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLLIElement] using the tag 'li'.
  HTMLLIElement() : _ = document.createElement('li');

  external int get value;
  external set value(int value);
  external String get type;
  external set type(String value);
}

/// The **`HTMLDListElement`** interface provides special properties (beyond
/// those of the regular [HTMLElement] interface it also has available to it by
/// inheritance) for manipulating definition list (`dl`) elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLDListElement).
extension type HTMLDListElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLDListElement] using the tag 'dl'.
  HTMLDListElement() : _ = document.createElement('dl');

  external bool get compact;
  external set compact(bool value);
}

/// The **`HTMLDivElement`** interface provides special properties (beyond the
/// regular [HTMLElement] interface it also has available to it by inheritance)
/// for manipulating `div` elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLDivElement).
extension type HTMLDivElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLDivElement] using the tag 'div'.
  HTMLDivElement() : _ = document.createElement('div');

  external String get align;
  external set align(String value);
}

/// The **`HTMLAnchorElement`** interface represents hyperlink elements and
/// provides special properties and methods (beyond those of the regular
/// [HTMLElement] object interface that they inherit from) for manipulating the
/// layout and presentation of such elements. This interface corresponds to
/// [`<a>`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/a)
/// element; not to be confused with
/// [`<link>`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/link),
/// which is represented by
/// [`HTMLLinkElement`](https://developer.mozilla.org/en-US/docs/Web/API/HTMLLinkElement).
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLAnchorElement).
extension type HTMLAnchorElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLAnchorElement] using the tag 'a'.
  HTMLAnchorElement() : _ = document.createElement('a');

  /// The **`target`** property of the [HTMLAnchorElement] interface is a string
  /// that indicates where to display the linked resource.
  ///
  /// It reflects the
  /// [`target`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/a#target)
  /// attribute of the `a` element.
  external String get target;
  external set target(String value);

  /// The **`HTMLAnchorElement.download`** property is a
  /// string indicating that the linked resource is intended to be
  /// downloaded rather than displayed in the browser. The value, if any,
  /// specifies the
  /// default file name for use in labeling the resource in a local file system.
  /// If the name
  /// is not a valid file name in the underlying OS, the browser will adjust it.
  ///
  /// > **Note:** This value might not be used for download. This value cannot
  /// > be used to determine whether the download will occur.
  external String get download;
  external set download(String value);

  /// The **`ping`** property of the [HTMLAnchorElement] interface is a
  /// space-separated list of URLs. When the link is followed, the browser will
  /// send `POST` requests with the body PING to the URLs.
  ///
  /// It reflects the `ping` attribute of the `a` element.
  ///
  /// > **Note:** This property is not effective in Firefox and its usage may be
  /// > limited due to privacy and security concerns.
  external String get ping;
  external set ping(String value);

  /// The **`HTMLAnchorElement.rel`** property reflects the
  /// [`rel`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/rel)
  /// attribute. It is a string containing a space-separated list of link types
  /// indicating the relationship between the resource represented by the `a`
  /// element and the current document.
  external String get rel;
  external set rel(String value);

  /// The **`HTMLAnchorElement.relList`** read-only property reflects the
  /// [`rel`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/rel)
  /// attribute. It is a live [DOMTokenList] containing the set of link types
  /// indicating the relationship between the resource represented by the `a`
  /// element and the current document.
  ///
  /// The property itself is read-only, meaning you can't substitute the
  /// [DOMTokenList] with another one, but its contents can still be changed.
  external DOMTokenList get relList;

  /// The **`hreflang`** property of the [HTMLAnchorElement] interface is a
  /// string that is the language of the linked resource.
  ///
  /// It reflects the `hreflang` attribute of the `a` element and is the empty
  /// string (`""`) if there is no `hreflang` element.
  ///
  /// Web browsers and search engines may use this information to understand the
  /// language of the linked content better, but they are not required to follow
  /// it. The value provided for the `hreflang` attribute adheres to the format
  /// defined in `5646, "Tags for Identifying Languages (also known as BCP
  /// 47)"`. If not, it is ignored.
  ///
  /// Web browsers do not rely solely on the `hreflang` attribute after fetching
  /// the linked resource. Instead, they use language information directly
  /// associated with the resource (e.g., through HTTP headers) to determine its
  /// language.
  external String get hreflang;
  external set hreflang(String value);

  /// The **`type`** property of the [HTMLAnchorElement] interface is a string
  /// that indicates the MIME type of the linked resource.
  ///
  /// It reflects the `type` attribute of the `a` element.
  external String get type;
  external set type(String value);

  /// The **`text`** property of the [HTMLAnchorElement] represents the text
  /// inside the the element.
  /// This property represents the same information as [Node.textContent].
  external String get text;
  external set text(String value);

  /// The
  /// **`HTMLAnchorElement.referrerPolicy`**
  /// property reflect the HTML
  /// [`referrerpolicy`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/a#referrerpolicy)
  /// attribute of the
  /// `a` element defining which referrer is sent when fetching the resource.
  external String get referrerPolicy;
  external set referrerPolicy(String value);
  external String get coords;
  external set coords(String value);
  external String get charset;
  external set charset(String value);
  external String get name;
  external set name(String value);
  external String get rev;
  external set rev(String value);
  external String get shape;
  external set shape(String value);

  /// The **`HTMLAnchorElement.href`** property is a
  /// that returns a string containing the whole URL, and allows
  /// the href to be updated.
  external String get href;
  external set href(String value);

  /// The
  /// **`HTMLAnchorElement.origin`** read-only property is a
  /// string containing the Unicode serialization of the origin of the
  /// represented URL.
  ///
  /// That is:
  ///
  /// - for URL using the `http` or `https`, the scheme followed by
  /// `'://'`, followed by the domain, followed by `':'`, followed by
  /// the port (the default port, `80` and `443` respectively, if
  /// explicitly specified);
  /// - for URL using `file:` scheme, the value is browser dependent;
  /// - for URL using the `blob:` scheme, the origin of the URL following
  /// `blob:`. E.g `"blob:https://mozilla.org"` will have
  /// `"https://mozilla.org".`
  external String get origin;

  /// The
  /// **`HTMLAnchorElement.protocol`**
  /// property is a string representing the protocol scheme of the URL,
  /// including the final `':'`.
  external String get protocol;
  external set protocol(String value);

  /// The **`HTMLAnchorElement.username`** property is a
  /// string containing the username specified before the domain name.
  external String get username;
  external set username(String value);

  /// The **`HTMLAnchorElement.password`** property is a
  /// string containing the password specified before the domain name.
  ///
  /// If it is set without first setting the
  /// [`username`](https://developer.mozilla.org/en-US/docs/Web/API/HTMLAnchorElement/username)
  /// property, it silently fails.
  external String get password;
  external set password(String value);

  /// The **`HTMLAnchorElement.host`** property is a
  /// string containing the host, that is the _hostname_, and then,
  /// if the _port_ of the URL is nonempty, a `':'`, and the _port_
  /// of the URL.
  external String get host;
  external set host(String value);

  /// The **`HTMLAnchorElement.hostname`** property is a
  /// string containing the domain of the URL.
  external String get hostname;
  external set hostname(String value);

  /// The **`HTMLAnchorElement.port`** property is a
  /// string containing the port number of the URL. If the URL does not
  /// contain an explicit port number, it will be set to `''`.
  external String get port;
  external set port(String value);

  /// The **`HTMLAnchorElement.pathname`** property is a
  /// string containing an initial `'/'` followed by the path of
  /// the URL not including the query string or fragment (or the empty string if
  /// there is no
  /// path).
  external String get pathname;
  external set pathname(String value);

  /// The **`HTMLAnchorElement.search`** property is a search
  /// string, also called a _query string_, that is a string containing
  /// a `'?'` followed by the parameters of the URL.
  ///
  /// Modern browsers provide
  /// [`URLSearchParams`](https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams/get#examples)
  /// and
  /// [`URL.searchParams`](/en-US/docs/Web/API/URL/searchParams#examples)
  /// to make it easy to parse out the parameters from the querystring.
  external String get search;
  external set search(String value);

  /// The
  /// **`HTMLAnchorElement.hash`** property returns a
  /// string containing a `'#'` followed by the fragment
  /// identifier of the URL.
  ///
  /// The fragment is [URL encoded](https://en.wikipedia.org/wiki/URL_encoding).
  /// If the URL does not
  /// have a fragment identifier, this property contains an empty string, `""`.
  external String get hash;
  external set hash(String value);
}

/// The **`HTMLDataElement`** interface provides special properties (beyond the
/// regular [HTMLElement] interface it also has available to it by inheritance)
/// for manipulating `data` elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLDataElement).
extension type HTMLDataElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLDataElement] using the tag 'data'.
  HTMLDataElement() : _ = document.createElement('data');

  /// The **`value`** property of the [HTMLDataElement]
  /// interface returns a string reflecting the
  /// [`value`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/data#value)
  /// HTML attribute.
  external String get value;
  external set value(String value);
}

/// The **`HTMLTimeElement`** interface provides special properties (beyond the
/// regular [HTMLElement] interface it also has available to it by inheritance)
/// for manipulating `time` elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLTimeElement).
extension type HTMLTimeElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLTimeElement] using the tag 'time'.
  HTMLTimeElement() : _ = document.createElement('time');

  /// The
  /// **`HTMLTimeElement.dateTime`**
  /// property is a string that reflects the
  /// [`datetime`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/time#datetime)
  /// HTML attribute, containing a machine-readable form of the element's date
  /// and
  /// time value.
  ///
  /// The format of the string must follow one of the following HTML
  /// microsyntaxes:
  ///
  /// <table class="no-markdown">
  ///   <thead>
  ///     <tr>
  ///       <th scope="col">Microsyntax</th>
  ///       <th scope="col">Description</th>
  ///       <th scope="col">Examples</th>
  ///     </tr>
  ///   </thead>
  ///   <tbody>
  ///     <tr>
  ///       <td>Valid month string</td>
  ///       <td><em>YYYY</em><code>-</code><em>MM</em></td>
  ///       <td><code>2011-11</code>, <code>2013-05</code></td>
  ///     </tr>
  ///     <tr>
  ///       <td>Valid date string</td>
  ///       <td><em>YYYY</em><code>-</code><em>MM</em><code>-</code><em>DD</em></td>
  ///       <td><code>1887-12-01</code></td>
  ///     </tr>
  ///     <tr>
  ///       <td>Valid yearless date string</td>
  ///       <td><em>MM</em><code>-</code><em>DD</em></td>
  ///       <td><code>11-12</code></td>
  ///     </tr>
  ///     <tr>
  ///       <td>Valid time string</td>
  ///       <td>
  ///         <em>HH</em><code>:</code><em>MM</em><br /><em>HH</em><code>:</code
  /// ><em>MM</em><code>:</code><em>SS</em><br /><em>HH</em><code>:</code
  /// ><em>MM</em><code>:</code><em>SS</em><code>.</code><em>mmm</em>
  ///       </td>
  ///       <td>
  ///         <code>23:59</code><br /><code>12:15:47</code><br /><code
  /// >12:15:52.998</code
  /// >
  ///       </td>
  ///     </tr>
  ///     <tr>
  ///       <td>Valid local date and time string</td>
  ///       <td>
  ///         <em>YYYY</em><code>-</code><em>MM</em><code>-</code><em>DD</em>
  ///         <em>HH</em><code>:</code><em>MM</em><br /><em>YYYY</em><code>-</code
  /// ><em>MM</em><code>-</code><em>DD</em> <em>HH</em><code>:</code
  /// ><em>MM</em><code>:</code><em>SS</em><br /><em>YYYY</em><code>-</code
  /// ><em>MM</em><code>-</code><em>DD</em> <em>HH</em><code>:</code
  /// ><em>MM</em><code>:</code><em>SS</em><code>.</code><em>mmm</em><br /><em
  /// >YYYY</em
  /// ><code>-</code><em>MM</em><code>-</code><em>DD</em><code>T</code
  /// ><em>HH</em><code>:</code><em>MM</em><br /><em>YYYY</em><code>-</code
  /// ><em>MM</em><code>-</code><em>DD</em><code>T</code><em>HH</em
  /// ><code>:</code><em>MM</em><code>:</code><em>SS</em><br /><em>YYYY</em
  /// ><code>-</code><em>MM</em><code>-</code><em>DD</em><code>T</code
  /// ><em>HH</em><code>:</code><em>MM</em><code>:</code><em>SS</em
  /// ><code>.</code><em>mmm</em>
  ///       </td>
  ///       <td>
  ///         <code
  /// >2013-12-25 11:12<br />1972-07-25 13:43:07<br />1941-03-15
  /// 07:06:23.678<br />2013-12-25T11:12<br />1972-07-25T13:43:07<br
  /// />1941-03-15T07:06:23.678</code
  /// >
  ///       </td>
  ///     </tr>
  ///     <tr>
  ///       <td>Valid time-zone offset string</td>
  ///       <td>
  ///         <code>Z</code><br /><code>+</code><em>HHMM</em><br /><code>+</code
  /// ><em>HH</em><code>:</code><em>MM</em><br /><code>-</code><em>HHMM</em
  /// ><br /><code>-</code><em>HH</em><code>:</code><em>MM</em>
  ///       </td>
  ///       <td>
  ///         <code>Z<br />+0200<br />+04:30<br />-0300<br />-08:00</code>
  ///       </td>
  ///     </tr>
  ///     <tr>
  ///       <td>Valid global date and time string</td>
  ///       <td>
  ///         <em
  /// >Any combination of a valid local date and time string followed by a
  /// valid time-zone offset string</em
  /// >
  ///       </td>
  ///       <td>
  ///         <code
  /// >2013-12-25 11:12+0200<br />1972-07-25 13:43:07+04:30<br />1941-03-15
  /// 07:06:23.678Z<br />2013-12-25T11:12-08:00</code
  /// >
  ///       </td>
  ///     </tr>
  ///     <tr>
  ///       <td>Valid week string</td>
  ///       <td><em>YYYY</em><code>-W</code><em>WW</em></td>
  ///       <td><code>2013-W46</code></td>
  ///     </tr>
  ///     <tr>
  ///       <td>Four or more ASCII digits</td>
  ///       <td><em>YYYY</em></td>
  ///       <td><code>2013</code>, <code>0001</code></td>
  ///     </tr>
  ///     <tr>
  ///       <td>Valid duration string</td>
  ///       <td>
  ///         <code>P</code><em>d</em><code>D</code><code>T</code><em>h</em
  /// ><code>H</code><em>m</em><code>M</code><em>s</em><code>S</code
  /// ><br /><code>P</code><em>d</em><code>D</code><code>T</code><em>h</em
  /// ><code>H</code><em>m</em><code>M</code><em>s</em><code>.</code>X<code
  /// >S</code
  /// ><br /><code>P</code><em>d</em><code>D</code><code>T</code><em>h</em
  /// ><code>H</code><em>m</em><code>M</code><em>s</em><code>.</code>XX<code
  /// >S</code
  /// ><br /><code>P</code><em>d</em><code>D</code><code>T</code><em>h</em
  /// ><code>H</code><em>m</em><code>M</code><em>s</em><code>.</code>XXX<code
  /// >S</code
  /// ><br /><code>P</code><code>T</code><em>h</em><code>H</code><em>m</em
  /// ><code>M</code><em>s</em><code>S</code><br /><code>P</code><code>T</code
  /// ><em>h</em><code>H</code><em>m</em><code>M</code><em>s</em
  /// ><code>.</code>X<code>S</code><br /><code>P</code><code>T</code
  /// ><em>h</em><code>H</code><em>m</em><code>M</code><em>s</em
  /// ><code>.</code>XX<code>S</code><br /><code>P</code><code>T</code
  /// ><em>h</em><code>H</code><em>m</em><code>M</code><em>s</em
  /// ><code>.</code>XXX<code>S</code><br /><em>w</em><code>w </code><em>d</em
  /// ><code>d </code><em>h</em><code>h </code><em>m</em><code>m </code
  /// ><em>s</em><code>s</code>
  ///       </td>
  ///       <td>
  ///         <code
  /// >P12DT7H12M13S<br />P12DT7H12M13.3S<br />P12DT7H12M13.45S<br
  /// />P12DT7H12M13.455S<br />PT7H12M13S<br />PT7H12M13.2S<br
  /// />PT7H12M13.56S<br />PT7H12M13.999S<br />7d
  /// 5h 24m 13s</code
  /// >
  ///       </td>
  ///     </tr>
  ///   </tbody>
  /// </table>
  external String get dateTime;
  external set dateTime(String value);
}

/// The **`HTMLSpanElement`** interface represents a `span` element and derives
/// from the [HTMLElement] interface, but without implementing any additional
/// properties or methods.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLSpanElement).
extension type HTMLSpanElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLSpanElement] using the tag 'span'.
  HTMLSpanElement() : _ = document.createElement('span');
}

/// The **`HTMLBRElement`** interface represents an HTML line break element
/// (`br`). It inherits from [HTMLElement].
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLBRElement).
extension type HTMLBRElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLBRElement] using the tag 'br'.
  HTMLBRElement() : _ = document.createElement('br');

  external String get clear;
  external set clear(String value);
}

/// The **`HTMLModElement`** interface provides special properties (beyond the
/// regular methods and properties available through the [HTMLElement] interface
/// they also have available to them by inheritance) for manipulating
/// modification elements, that is `del` and `ins`.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLModElement).
extension type HTMLModElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLModElement] using the tag 'ins'.
  HTMLModElement.ins() : _ = document.createElement('ins');

  /// Creates an [HTMLModElement] using the tag 'del'.
  HTMLModElement.del() : _ = document.createElement('del');

  external String get cite;
  external set cite(String value);
  external String get dateTime;
  external set dateTime(String value);
}

/// The **`HTMLPictureElement`** interface represents a `picture` HTML element.
/// It doesn't implement specific properties or methods.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLPictureElement).
extension type HTMLPictureElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLPictureElement] using the tag 'picture'.
  HTMLPictureElement() : _ = document.createElement('picture');
}

/// The **`HTMLSourceElement`** interface provides special properties (beyond
/// the regular [HTMLElement] object interface it also has available to it by
/// inheritance) for manipulating `source` elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLSourceElement).
extension type HTMLSourceElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLSourceElement] using the tag 'source'.
  HTMLSourceElement() : _ = document.createElement('source');

  external String get src;
  external set src(String value);
  external String get type;
  external set type(String value);
  external String get srcset;
  external set srcset(String value);
  external String get sizes;
  external set sizes(String value);
  external String get media;
  external set media(String value);

  /// The **`width`** property of the [HTMLSourceElement] interface is a
  /// non-negative number indicating the width of the image resource in CSS
  /// pixels.
  ///
  /// The property has an effect only if the parent of the current `source`
  /// element is a `picture` element.
  ///
  /// It reflects the `width` attribute of the `source` element.
  external int get width;
  external set width(int value);

  /// The **`height`** property of the [HTMLSourceElement] interface is a
  /// non-negative number indicating the height of the image resource in CSS
  /// pixels.
  ///
  /// The property has an effect only if the parent of the current `source`
  /// element is a `picture` element.
  ///
  /// It reflects the `height` attribute of the `source` element.
  external int get height;
  external set height(int value);
}

/// The **`HTMLImageElement`** interface represents an HTML `img` element,
/// providing the properties and methods used to manipulate image elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLImageElement).
extension type HTMLImageElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLImageElement] using the tag 'img'.
  HTMLImageElement() : _ = document.createElement('img');

  /// The **`decode()`**
  /// method of the [HTMLImageElement] interface returns a
  /// `Promise` that resolves once the image is decoded and it is safe to append
  /// it to the DOM.
  ///
  /// This can be used to initiate loading of the image prior
  /// to attaching it to an element in the DOM (or adding it to the DOM as a new
  /// element), so
  /// that the image can be rendered immediately upon being added to the DOM.
  /// This, in turn,
  /// prevents the rendering of the next frame after adding the image to the DOM
  /// from causing
  /// a delay while the image loads.
  external JSPromise<JSAny?> decode();

  /// The [HTMLImageElement] property **`alt`** provides fallback (alternate)
  /// text to display when the image specified by the `img` element is not
  /// loaded.
  ///
  /// This may be the case because of an error, because the user has disabled
  /// the loading of images, or because the image hasn't finished loading yet.
  ///
  /// Perhaps the most important reason to use the `alt` property is to support
  /// [accessibility](https://developer.mozilla.org/en-US/docs/Web/Accessibility),
  /// as the `alt` text may be used by screen readers and other assistive
  /// technologies to help people with a disability make full use of your
  /// content.
  /// It will be read aloud or sent to a braille output device, for example, to
  /// support blind or visually impaired users.
  ///
  /// > **Think of it like this:** When choosing `alt` strings for your images,
  /// > imagine what you would say when reading the page to someone over the
  /// > phone without mentioning that there's an image on the page.
  ///
  /// The alternate text is displayed in the space the image would occupy and
  /// should be able to take the place of the image _without altering the
  /// meaning of the page_.
  external String get alt;
  external set alt(String value);

  /// The [HTMLImageElement] property
  /// **`src`**, which reflects the HTML
  /// [`src`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img#src)
  /// attribute, specifies the image to display in the `img`
  /// element.
  external String get src;
  external set src(String value);

  /// The [HTMLImageElement] property
  /// **`srcset`** is a string which identifies one or more
  /// **image candidate strings**, separated using commas (`,`) each
  /// specifying image resources to use under given circumstances.
  ///
  /// Each image
  /// candidate string contains an image URL and an optional width or pixel
  /// density descriptor
  /// that indicates the conditions under which that candidate should be used
  /// instead of the
  /// image specified by the [HTMLImageElement.src] property.
  ///
  /// The `srcset` property, along with the [HTMLImageElement.sizes]
  /// property, are a crucial component in designing responsive websites, as
  /// they
  /// can be used together to make pages that use appropriate images for the
  /// rendering
  /// situation.
  ///
  /// > **Note:** If the
  /// > [`srcset`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img#srcset)
  /// > attribute uses width descriptors, the `sizes` attribute must also be
  /// > present, or the `srcset` itself will be ignored.
  external String get srcset;
  external set srcset(String value);

  /// The [HTMLImageElement] property
  /// **`sizes`** allows you to specify the layout width of the
  /// [image](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img) for
  /// each of a list of media conditions. This provides the ability to
  /// automatically select among different images—even images of different
  /// orientations or
  /// aspect ratios—as the document state changes to match different media
  /// conditions.
  ///
  /// Each condition is specified using the same conditional format used
  /// by
  /// [media queries](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_media_queries).
  external String get sizes;
  external set sizes(String value);

  /// The [HTMLImageElement]
  /// interface's **`crossOrigin`** attribute is a string which
  /// specifies the Cross-Origin Resource Sharing () setting to use when
  /// retrieving the image.
  external String? get crossOrigin;
  external set crossOrigin(String? value);

  /// The **`useMap`** property on the
  /// [HTMLImageElement] interface reflects the value of the
  /// [`usemap`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img#usemap)
  /// attribute, which is a string
  /// providing the name of the client-side image map to apply to the image.
  external String get useMap;
  external set useMap(String value);

  /// The [HTMLImageElement] property **`isMap`** is a
  /// Boolean value which indicates that the image is to be used by a
  /// server-side image map.
  /// This may only be used on images located within an `a` element.
  ///
  /// > **Note:** For accessibility reasons, you should generally avoid using
  /// > server-side image maps, as they require the use of a mouse. Use a
  /// > [client-side image map](https://developer.mozilla.org/en-US/docs/Learn/HTML/Howto/Add_a_hit_map_on_top_of_an_image)
  /// > instead.
  external bool get isMap;
  external set isMap(bool value);

  /// The **`width`** property of the
  /// [HTMLImageElement] interface indicates the width at which an image is
  /// drawn in  if it's being drawn or rendered to
  /// any visual medium such as a screen or printer. Otherwise, it's the
  /// natural, pixel
  /// density-corrected width of the image.
  external int get width;
  external set width(int value);

  /// The **`height`** property of the
  /// [HTMLImageElement] interface indicates the height at which the image is
  /// drawn, in  if the image is being drawn or rendered to any
  /// visual medium such as the screen or a printer; otherwise, it's the
  /// natural, pixel
  /// density corrected height of the image.
  external int get height;
  external set height(int value);

  /// The [HTMLImageElement] interface's read-only
  /// **`naturalWidth`** property returns the intrinsic (natural),
  /// density-corrected width of the image in .
  ///
  /// This is the width the image is if drawn with nothing constraining
  /// its width; if you neither specify a width for the image nor place the
  /// image inside a
  /// container that limits or expressly specifies the image width, this is the
  /// number of CSS
  /// pixels wide the image will be.
  ///
  /// The corresponding [HTMLImageElement.naturalHeight] method
  /// returns the natural height of the image.
  ///
  /// > **Note:** Most of the time the natural width is the actual width of the
  /// > image sent by the server.
  /// > Nevertheless, browsers can modify an image before pushing it to the
  /// > renderer. For example, Chrome
  /// > [degrades the resolution of images on low-end devices](https://crbug.com/1187043#c7).
  /// > In such cases, `naturalWidth` will consider the width of the image
  /// > modified
  /// > by such browser interventions as the natural width, and returns this
  /// > value.
  external int get naturalWidth;

  /// The [HTMLImageElement] interface's
  /// **`naturalHeight`** property is a read-only value which
  /// returns the intrinsic (natural), density-corrected height of the image in
  /// .
  ///
  /// This is the height the image is if
  /// drawn with nothing constraining its height; if you don't specify a height
  /// for the image,
  /// or place the image inside a container that either limits or expressly
  /// specifies the
  /// image height, it will be rendered this tall.
  ///
  /// > **Note:** Most of the time the natural height is the actual height of
  /// > the image sent by the server.
  /// > Nevertheless, browsers can modify an image before pushing it to the
  /// > renderer. For example, Chrome
  /// > [degrades the resolution of images on low-end devices](https://crbug.com/1187043#c7).
  /// > In such cases, `naturalHeight` will consider the height of the image
  /// > modified
  /// > by such browser interventions as the natural height, and returns this
  /// > value.
  external int get naturalHeight;

  /// The read-only [HTMLImageElement] interface's
  /// **`complete`** attribute is a Boolean value which indicates
  /// whether or not the image has completely loaded.
  external bool get complete;

  /// The read-only [HTMLImageElement] property
  /// **`currentSrc`** indicates the URL of the image which is
  /// currently presented in the `img` element it represents.
  external String get currentSrc;

  /// The
  /// **`HTMLImageElement.referrerPolicy`**
  /// property reflects the HTML
  /// [`referrerpolicy`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img#referrerpolicy)
  /// attribute of the
  /// `img` element defining which referrer is sent when fetching the
  /// resource.
  external String get referrerPolicy;
  external set referrerPolicy(String value);

  /// The **`decoding`** property of the [HTMLImageElement] interface provides a
  /// hint to the browser as to how it should decode the image. More
  /// specifically, whether it should wait for the image to be decoded before
  /// presenting other content updates or not.
  external String get decoding;
  external set decoding(String value);

  /// The [HTMLImageElement] property **`loading`** is a string whose value
  /// provides a hint to the  on how to handle the loading of the image which is
  /// currently outside the window's .
  ///
  /// This helps to optimize the loading of the document's contents by
  /// postponing loading the image until it's expected to be needed, rather than
  /// immediately during the initial page load.
  external String get loading;
  external set loading(String value);

  /// The **`fetchPriority`** property of the
  /// [HTMLImageElement] interface represents a hint given to the browser on how
  /// it should prioritize the fetch of the image relative to other images.
  external String get fetchPriority;
  external set fetchPriority(String value);

  /// The read-only [HTMLImageElement] property
  /// **`x`** indicates the x-coordinate of the
  /// `img` element's left border edge relative to the root element's
  /// origin.
  ///
  /// The `x` and [HTMLImageElement.y] properties are only valid
  /// for an image if its `display` property has the computed value
  /// `table-column` or `table-column-group`. In other words: it has
  /// either of those values set explicitly on it, or it has inherited it from a
  /// containing
  /// element, or by being located within a column described by either `col`
  /// or `colgroup`.
  external int get x;

  /// The read-only [HTMLImageElement] property
  /// **`y`** indicates the y-coordinate of the
  /// `img` element's top border edge relative to the root element's
  /// origin.
  ///
  /// The [HTMLImageElement.x] and `y` properties are only valid
  /// for an image if its `display` property has the computed value
  /// `table-column` or `table-column-group`. In other words: it has
  /// either of those values set explicitly on it, or it has inherited it from a
  /// containing
  /// element, or by being located within a column described by either
  /// `col` or `colgroup`.
  external int get y;

  /// The [HTMLImageElement]
  /// interface's _deprecated_ **`name`** property specifies
  /// a name for the element. This has been replaced by the [Element.id]
  /// property available on all elements.
  external String get name;
  external set name(String value);
  external String get lowsrc;
  external set lowsrc(String value);

  /// The _obsolete_ **`align`**
  /// property of the [HTMLImageElement] interface is a string which indicates
  /// how to position the image relative to its container.
  ///
  /// You should instead use the
  /// CSS property , which does in fact also work on images
  /// despite its name. You can also use the `float` property to float the image
  /// to the left or right margin.
  ///
  /// The `align` property reflects the HTML
  /// [`align`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img#align)
  /// content attribute.
  external String get align;
  external set align(String value);

  /// The
  /// _obsolete_ **`hspace`** property of the
  /// [HTMLImageElement] interface specifies the number of pixels of empty
  /// space to leave empty on the left and right sides of the `img` element
  /// when laying out the page.
  ///
  /// This property reflects the
  /// [`hspace`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img#hspace)
  /// attribute.
  external int get hspace;
  external set hspace(int value);

  /// The _obsolete_ **`vspace`** property of the
  /// [HTMLImageElement] interface specifies the number of pixels of empty space
  /// to leave empty on the top and bottom of the `img` element when laying
  /// out the page.
  external int get vspace;
  external set vspace(int value);

  /// The _deprecated_ property **`longDesc`** on
  /// the [HTMLImageElement] interface specifies the URL of a text or HTML file
  /// which contains a long-form description of the image. This can be used to
  /// provide optional added details beyond the short description provided in
  /// the
  /// [`title`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes#title)
  /// attribute.
  external String get longDesc;
  external set longDesc(String value);

  /// The obsolete [HTMLImageElement]
  /// property **`border`** specifies the number of pixels thick the
  /// border surrounding the image should be. A value of 0, the default,
  /// indicates that no
  /// border should be drawn.
  ///
  /// You should _not_ use this property! Instead, you should use CSS to style
  /// the
  /// border. The `border` property or its longhand properties to not only set
  /// the thickness of the border but to potentially apply a wide variety of
  /// other styling
  /// options to it.
  ///
  /// The width, specifically, is controlled using the writing-mode aware
  /// , ,
  /// , and
  /// properties.
  ///
  /// For compatibility (or perhaps other) reasons, you can use the older
  /// properties instead
  /// (or in addition): , ,
  /// , and .
  external String get border;
  external set border(String value);
}

/// The **`HTMLIFrameElement`** interface provides special properties and
/// methods (beyond those of the [HTMLElement] interface it also has available
/// to it by inheritance) for manipulating the layout and presentation of inline
/// frame elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLIFrameElement).
extension type HTMLIFrameElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLIFrameElement] using the tag 'iframe'.
  HTMLIFrameElement() : _ = document.createElement('iframe');

  external Document? getSVGDocument();

  /// The **`HTMLIFrameElement.src`**
  /// A string that reflects the
  /// [`src`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/iframe#src)
  /// HTML attribute, containing the address of the content to be embedded.
  ///
  /// Note that programmatically removing an `<iframe>`'s src attribute (e.g.
  /// via [Element.removeAttribute]) causes `about:blank` to be loaded in the
  /// frame.
  external String get src;
  external set src(String value);

  /// The **`srcdoc`** property of the [HTMLIFrameElement] specifies the content
  /// of the page.
  external JSAny get srcdoc;
  external set srcdoc(JSAny value);

  /// The **`name`** property of the [HTMLIFrameElement] interface is a string
  /// value that reflects the `name` attribute of the `iframe` element,
  /// indicating the specific name of the `<iframe>` element.
  external String get name;
  external set name(String value);

  /// The **`sandbox`** read-only property of the [HTMLIFrameElement] interface
  /// returns a [DOMTokenList] indicating extra restrictions on the behavior of
  /// the nested content.
  ///
  /// It reflects the `sandbox` attribute of the `iframe` element.
  external DOMTokenList get sandbox;

  /// The **`allow`** property of the [HTMLIFrameElement] interface indicates
  /// the
  /// [Permissions Policy](https://developer.mozilla.org/en-US/docs/Web/HTTP/Permissions_Policy)
  /// specified for this `<iframe>` element. The policy defines what features
  /// are available to the `<iframe>` element (for example, access to the
  /// `microphone`, `camera`, `battery`, `web-share`, etc.) based on the origin
  /// of the request.
  ///
  /// The Permissions Policy specified by the `allow` attribute implements a
  /// further restriction on top of the policy specified in the  header. It
  /// doesn't replace it.
  ///
  /// See [`<iframe>`'s Permissions Policy
  /// syntax](/en-US/docs/Web/HTTP/Permissions_Policy#iframe_syntax) for more
  /// details.
  ///
  /// It reflects the `allow` attribute of the `iframe` element.
  external String get allow;
  external set allow(String value);

  /// The **`allowFullscreen`** property of the [HTMLIFrameElement] interface is
  /// a boolean value that reflects the `allowfullscreen` attribute of the
  /// `iframe` element, indicating whether to allow the iframe's contents to use
  /// [Element.requestFullscreen].
  ///
  /// > **Note:** This property is considered a legacy property. Use
  /// > `allow="fullscreen"` and [HTMLIFrameElement.allow] instead.
  external bool get allowFullscreen;
  external set allowFullscreen(bool value);

  /// The **`width`** property of the [HTMLIFrameElement] interface returns a
  /// string that reflects the `width` attribute of the `iframe` element,
  /// indicating the width of the frame in CSS pixels.
  external String get width;
  external set width(String value);

  /// The **`height`** property of the [HTMLIFrameElement] interface returns a
  /// string that reflects the `height` attribute of the `iframe` element,
  /// indicating the height of the frame in CSS pixels.
  external String get height;
  external set height(String value);

  /// The
  /// **`HTMLIFrameElement.referrerPolicy`**
  /// property reflects the HTML
  /// [`referrerpolicy`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/iframe#referrerpolicy)
  /// attribute of the
  /// `iframe` element defining which referrer is sent when fetching the
  /// resource.
  external String get referrerPolicy;
  external set referrerPolicy(String value);

  /// The **`loading`** property of the [HTMLIFrameElement] interface is a
  /// string that provides a hint to the  indicating whether the
  /// [iframe](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/iframe)
  /// should be loaded immediately on page load, or only when it is needed.
  ///
  /// This can be used to optimize the loading of the document's contents.
  /// Iframes that are visible when the page loads can be downloaded immediately
  /// (eagerly), while iframes that are likely to be offscreen on initial page
  /// load can be downloaded lazily — just before they will appear in the
  /// window's .
  external String get loading;
  external set loading(String value);

  /// If the iframe and the iframe's parent document are
  /// [Same Origin](https://developer.mozilla.org/en-US/docs/Web/Security/Same-origin_policy),
  /// returns a
  /// [`Document`](https://developer.mozilla.org/en-US/docs/Web/API/Document)
  /// (that is, the active document in the inline frame's nested browsing
  /// context), else returns `null`.
  external Document? get contentDocument;

  /// The **`contentWindow`** property returns the
  /// [Window](https://developer.mozilla.org/en-US/docs/Web/API/Window) object
  /// of an
  /// [HTMLIFrameElement](https://developer.mozilla.org/en-US/docs/Web/API/HTMLIFrameElement).
  ///
  /// This attribute is read-only.
  external Window? get contentWindow;
  external String get align;
  external set align(String value);
  external String get scrolling;
  external set scrolling(String value);
  external String get frameBorder;
  external set frameBorder(String value);
  external String get longDesc;
  external set longDesc(String value);
  external String get marginHeight;
  external set marginHeight(String value);
  external String get marginWidth;
  external set marginWidth(String value);
}

/// The **`HTMLEmbedElement`** interface provides special properties (beyond the
/// regular [HTMLElement] interface it also has available to it by inheritance)
/// for manipulating `embed` elements.
///
/// > **Note:** This topic describes the `HTMLEmbedElement` interface as defined
/// > in the standard. It does not address earlier, non-standardized version of
/// > the interface.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLEmbedElement).
extension type HTMLEmbedElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLEmbedElement] using the tag 'embed'.
  HTMLEmbedElement() : _ = document.createElement('embed');

  external Document? getSVGDocument();

  /// The **`src`** property of the [HTMLEmbedElement] interface returns a
  /// string that indicates the URL of the resource being embedded.
  ///
  /// It reflects the `src` attribute of the `embed` element.
  external String get src;
  external set src(String value);
  external String get type;
  external set type(String value);

  /// The **`width`** property of the [HTMLEmbedElement] interface returns a
  /// string that reflects the `width` attribute of the `embed` element,
  /// indicating the displayed width of the resource in CSS pixels.
  external String get width;
  external set width(String value);

  /// The **`height`** property of the [HTMLEmbedElement] interface returns a
  /// string that reflects the `height` attribute of the `embed` element,
  /// indicating the displayed height of the resource in CSS pixels.
  external String get height;
  external set height(String value);
  external String get align;
  external set align(String value);
  external String get name;
  external set name(String value);
}

/// The **`HTMLObjectElement`** interface provides special properties and
/// methods (beyond those on the [HTMLElement] interface it also has available
/// to it by inheritance) for manipulating the layout and presentation of
/// `object` element, representing external resources.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLObjectElement).
extension type HTMLObjectElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLObjectElement] using the tag 'object'.
  HTMLObjectElement() : _ = document.createElement('object');

  external Document? getSVGDocument();

  /// The **`checkValidity()`** method of the
  /// [HTMLObjectElement] interface returns a boolean value that always
  /// is true, because object objects are never candidates for constraint
  /// validation.
  external bool checkValidity();
  external bool reportValidity();

  /// The **`setCustomValidity()`** method of the
  /// [HTMLObjectElement] interface sets a custom validity message for the
  /// element.
  external void setCustomValidity(String error);

  /// The **`data`** property of the
  /// [HTMLObjectElement] interface returns a string that
  /// reflects the
  /// [`data`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/object#data)
  /// HTML attribute, specifying the address
  /// of a resource's data.
  external String get data;
  external set data(String value);

  /// The **`type`** property of the
  /// [HTMLObjectElement] interface returns a string that
  /// reflects the
  /// [`type`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/object#type)
  /// HTML attribute, specifying the MIME type
  /// of the resource.
  external String get type;
  external set type(String value);

  /// The **`name`** property of the
  /// [HTMLObjectElement] interface returns a string that
  /// reflects the
  /// [`name`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/object#name)
  /// HTML attribute, specifying the name of
  /// the browsing context.
  external String get name;
  external set name(String value);

  /// The **`form`** read-only property of the
  /// [HTMLObjectElement] interface returns a [HTMLFormElement]
  /// representing the object element's form owner, or null if there isn't one.
  external HTMLFormElement? get form;

  /// The **`width`** property of the
  /// [HTMLObjectElement] interface returns a string that
  /// reflects the
  /// [`width`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/object#width)
  /// HTML attribute, specifying the
  /// displayed width of the resource in CSS pixels.
  external String get width;
  external set width(String value);

  /// The **`height`** property of the
  /// [HTMLObjectElement] interface Returns a string that
  /// reflects the
  /// [`height`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/object#height)
  /// HTML attribute, specifying the
  /// displayed height of the resource in CSS pixels.
  external String get height;
  external set height(String value);

  /// The **`contentDocument`** read-only property of
  /// the [HTMLObjectElement] interface Returns a [Document]
  /// representing the active document of the object element's nested browsing
  /// context, if
  /// any; otherwise null.
  external Document? get contentDocument;

  /// The **`contentWindow`** read-only property of
  /// the [HTMLObjectElement] interface returns a
  /// representing the window proxy of the object element's nested browsing
  /// context, if any;
  /// otherwise null.
  external Window? get contentWindow;

  /// The **`willValidate`** read-only property of
  /// the [HTMLObjectElement] interface returns a boolean value that
  /// indicates whether the element is a candidate for constraint validation.
  /// Always false for
  /// HTMLObjectElement objects.
  external bool get willValidate;

  /// The **`validity`** read-only property of the
  /// [HTMLObjectElement] interface returns a [ValidityState] with
  /// the validity states that this element is in.
  external ValidityState get validity;

  /// The **`validationMessage`** read-only property
  /// of the [HTMLObjectElement] interface returns a string
  /// representing a localized message that describes the validation constraints
  /// that the
  /// control does not satisfy (if any). This is the empty string if the control
  /// is not a
  /// candidate for constraint validation (willValidate is false), or it
  /// satisfies its
  /// constraints.
  external String get validationMessage;
  external String get align;
  external set align(String value);
  external String get archive;
  external set archive(String value);
  external String get code;
  external set code(String value);
  external bool get declare;
  external set declare(bool value);
  external int get hspace;
  external set hspace(int value);
  external String get standby;
  external set standby(String value);
  external int get vspace;
  external set vspace(int value);
  external String get codeBase;
  external set codeBase(String value);
  external String get codeType;
  external set codeType(String value);

  /// The **`useMap`** property of the
  /// [HTMLObjectElement] interface returns a string that
  /// reflects the
  /// [`usemap`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/object#usemap)
  /// HTML attribute, specifying a
  /// `map` element to use.
  external String get useMap;
  external set useMap(String value);
  external String get border;
  external set border(String value);
}

/// Implemented by the `video` element, the **`HTMLVideoElement`** interface
/// provides special properties and methods for manipulating video objects. It
/// also inherits properties and methods of [HTMLMediaElement] and
/// [HTMLElement].
///
/// The list of
/// [supported media formats](https://developer.mozilla.org/en-US/docs/Web/Media/Formats)
/// varies from one browser to the other. You should either provide your video
/// in a single format that all the relevant browsers supports, or provide
/// multiple video sources in enough different formats that all the browsers you
/// need to support are covered.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLVideoElement).
extension type HTMLVideoElement._(JSObject _)
    implements HTMLMediaElement, JSObject {
  /// Creates an [HTMLVideoElement] using the tag 'video'.
  HTMLVideoElement() : _ = document.createElement('video');

  /// The **[HTMLVideoElement]** method
  /// **`getVideoPlaybackQuality()`** creates and returns a
  /// [VideoPlaybackQuality] object containing metrics including how many
  /// frames have been lost.
  ///
  /// The data returned can be used to evaluate the quality of the video stream.
  external VideoPlaybackQuality getVideoPlaybackQuality();

  /// The **[HTMLVideoElement]** method
  /// **`requestPictureInPicture()`** issues an asynchronous request
  /// to display the video in picture-in-picture mode.
  ///
  /// It's not guaranteed that the video will be put into picture-in-picture. If
  /// permission
  /// to enter that mode is granted, the returned `Promise` will resolve and the
  /// video will receive a [HTMLVideoElement.enterpictureinpicture_event] event
  /// to let it know that it's now in picture-in-picture.
  external JSPromise<PictureInPictureWindow> requestPictureInPicture();

  /// The **`requestVideoFrameCallback()`** method of the [HTMLVideoElement]
  /// interface registers a callback function that runs when a new video frame
  /// is sent to the compositor. This enables developers to perform efficient
  /// operations on each video frame.
  external int requestVideoFrameCallback(VideoFrameRequestCallback callback);

  /// The **`cancelVideoFrameCallback()`** method of the [HTMLVideoElement]
  /// interface cancels a previously-registered video frame callback.
  external void cancelVideoFrameCallback(int handle);

  /// The **`width`** property of the [HTMLVideoElement] interface returns an
  /// integer that reflects the `width` attribute of the `video` element,
  /// specifying the displayed width of the resource in CSS pixels.
  external int get width;
  external set width(int value);

  /// The **`height`** property of the [HTMLVideoElement] interface returns an
  /// integer that reflects the `height` attribute of the `video` element,
  /// specifying the displayed height of the resource in CSS pixels.
  external int get height;
  external set height(int value);

  /// The [HTMLVideoElement] interface's read-only **`videoWidth`** property
  /// indicates the
  /// [intrinsic width](https://developer.mozilla.org/en-US/docs/Web/API/HTMLVideoElement/videoHeight#about_intrinsic_width_and_height)
  /// of the video, expressed in CSS pixels.
  /// In simple terms, this is the width of the media in its natural size.
  ///
  /// See [`HTMLVideoElement.videoHeight` > About intrinsic width and
  /// height](/en-US/docs/Web/API/HTMLVideoElement/videoHeight#about_intrinsic_width_and_height)
  /// for more details.
  external int get videoWidth;

  /// The [HTMLVideoElement] interface's read-only **`videoHeight`** property
  /// indicates the [intrinsic height](#about_intrinsic_width_and_height) of the
  /// video, expressed in CSS pixels.
  /// In simple terms, this is the height of the media in its natural size.
  external int get videoHeight;

  /// The **`poster`** property of the [HTMLVideoElement] interface is a string
  /// that reflects the URL for an image to be shown while no video data is
  /// available. If the property does not represent a valid URL, no poster frame
  /// will be shown.
  ///
  /// It reflects the `poster` attribute of the `video` element.
  external String get poster;
  external set poster(String value);
  external bool get playsInline;
  external set playsInline(bool value);
  external EventHandler get onenterpictureinpicture;
  external set onenterpictureinpicture(EventHandler value);
  external EventHandler get onleavepictureinpicture;
  external set onleavepictureinpicture(EventHandler value);

  /// The [HTMLVideoElement] **`disablePictureInPicture`** property reflects the
  /// HTML attribute indicating whether the picture-in-picture feature is
  /// disabled for the current element.
  external bool get disablePictureInPicture;
  external set disablePictureInPicture(bool value);
}

/// The **`HTMLAudioElement`** interface provides access to the properties of
/// `audio` elements, as well as methods to manipulate them.
///
/// This element is based on, and inherits properties and methods from, the
/// [HTMLMediaElement] interface.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLAudioElement).
extension type HTMLAudioElement._(JSObject _)
    implements HTMLMediaElement, JSObject {
  /// Creates an [HTMLAudioElement] using the tag 'audio'.
  HTMLAudioElement() : _ = document.createElement('audio');
}

/// The **`HTMLTrackElement`** interface represents an  `track` element within
/// the . This element can be used as a child of either `audio` or `video` to
/// specify a text track containing information such as closed captions or
/// subtitles.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLTrackElement).
extension type HTMLTrackElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLTrackElement] using the tag 'track'.
  HTMLTrackElement() : _ = document.createElement('track');

  static const int NONE = 0;

  static const int LOADING = 1;

  static const int LOADED = 2;

  static const int ERROR = 3;

  external String get kind;
  external set kind(String value);

  /// The **`HTMLTrackElement.src`** property reflects the value of
  /// the `track` element's
  /// [`src`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/track#src)
  /// attribute, which
  /// indicates the URL of the text track's data.
  external String get src;
  external set src(String value);
  external String get srclang;
  external set srclang(String value);
  external String get label;
  external set label(String value);
  @JS('default')
  external bool get default_;
  @JS('default')
  external set default_(bool value);
  external int get readyState;
  external TextTrack get track;
}

/// The **`HTMLMediaElement`** interface adds to [HTMLElement] the properties
/// and methods needed to support basic media-related capabilities that are
/// common to audio and video.
///
/// The [HTMLVideoElement] and [HTMLAudioElement] elements both inherit this
/// interface.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement).
extension type HTMLMediaElement._(JSObject _) implements HTMLElement, JSObject {
  static const int NETWORK_EMPTY = 0;

  static const int NETWORK_IDLE = 1;

  static const int NETWORK_LOADING = 2;

  static const int NETWORK_NO_SOURCE = 3;

  static const int HAVE_NOTHING = 0;

  static const int HAVE_METADATA = 1;

  static const int HAVE_CURRENT_DATA = 2;

  static const int HAVE_FUTURE_DATA = 3;

  static const int HAVE_ENOUGH_DATA = 4;

  /// The [HTMLMediaElement] method
  /// **`load()`** resets the media element to its initial state and
  /// begins the process of selecting a media source and loading the media in
  /// preparation
  /// for playback to begin at the beginning.
  ///
  /// The amount of media data that is
  /// prefetched is determined by the value of the element's
  /// [`preload`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/video#preload)
  /// attribute.
  ///
  /// This method is generally only useful when you've made dynamic changes to
  /// the set of
  /// sources available for the media element, either by changing the element's
  /// [`src`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/video#src)
  /// attribute or by adding or removing
  /// `source` elements nested within the media element itself.
  /// `load()` will reset the element and rescan the available sources, thereby
  /// causing the changes to take effect.
  external void load();

  /// The [HTMLMediaElement] method **`canPlayType()`** reports how likely it is
  /// that the current browser will be able to play media of a given MIME type.
  external CanPlayTypeResult canPlayType(String type);

  /// The **`HTMLMediaElement.fastSeek()`** method quickly seeks the
  /// media to the new time with precision tradeoff.
  ///
  /// > **Note:** If you need to seek with precision, you should set
  /// > [`HTMLMediaElement.currentTime`](https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement/currentTime)
  /// > instead.
  external void fastSeek(num time);
  external JSObject getStartDate();

  /// The [HTMLMediaElement]
  /// **`play()`** method attempts to begin playback of the media.
  /// It returns a `Promise` which is resolved when playback has been
  /// successfully started.
  ///
  /// Failure to begin playback for any reason, such as
  /// permission issues, result in the promise being rejected.
  external JSPromise<JSAny?> play();

  /// The **`HTMLMediaElement.pause()`** method will pause playback
  /// of the media, if the media is already in a paused state this method will
  /// have no effect.
  external void pause();
  external TextTrack addTextTrack(
    TextTrackKind kind, [
    String label,
    String language,
  ]);

  /// The **`HTMLMediaElement.setSinkId()`** method of the
  /// [Audio Output Devices API](https://developer.mozilla.org/en-US/docs/Web/API/Audio_Output_Devices_API)
  /// sets the ID of the audio device to use for output and returns a `Promise`.
  ///
  /// This only works when the application is permitted to use the specified
  /// device.
  /// For more information see the
  /// [security requirements](#security_requirements) below.
  external JSPromise<JSAny?> setSinkId(String sinkId);

  /// The **`setMediaKeys()`** method of the [HTMLMediaElement] interface sets
  /// the [MediaKeys] that will be used to decrypt media during playback.
  ///
  /// It returns a `Promise` that fulfils if the new keys are successfully set,
  /// or rejects if keys cannot be set.
  external JSPromise<JSAny?> setMediaKeys(MediaKeys? mediaKeys);

  /// The **`captureStream()`** method of the [HTMLMediaElement] interface
  /// returns a [MediaStream] object which is streaming a real-time capture of
  /// the content being rendered in the media element.
  ///
  /// This can be used, for example, as a source for a
  /// [WebRTC](https://developer.mozilla.org/en-US/docs/Web/API/WebRTC_API)
  /// [RTCPeerConnection].
  external MediaStream captureStream();

  /// The **`HTMLMediaElement.error`** property is the
  /// [MediaError] object for the most recent error, or `null` if
  /// there has not been an error. When an [HTMLMediaElement.error_event] event
  /// is received by the
  /// element, you can determine details about what happened by examining this
  /// object.
  external MediaError? get error;

  /// The **`HTMLMediaElement.src`** property reflects the value of
  /// the HTML media element's `src` attribute, which indicates the URL of a
  /// media
  /// resource to use in the element.
  ///
  /// > **Note:** The best way to know the URL of the media resource currently
  /// > in active use in this element is to look at the value of the
  /// > [HTMLMediaElement.currentSrc] attribute, which also takes
  /// > into account selection of a best or preferred media resource from a list
  /// > provided in
  /// > an [HTMLSourceElement] (which represents a `source`
  /// > element).
  external String get src;
  external set src(String value);

  /// The **`srcObject`** property of the
  /// [HTMLMediaElement] interface sets or returns the object which serves as
  /// the source of the media associated with the [HTMLMediaElement].
  ///
  /// The object can be a [MediaStream], a [MediaSource], a
  /// [Blob], or a [File] (which inherits from `Blob`).
  ///
  /// > **Note:** As of March 2020, only Safari has full support for
  /// > `srcObject`, i.e. using `MediaSource`, `MediaStream`, `Blob`, and `File`
  /// > objects as values. Other browsers support `MediaStream` objects; until
  /// > they catch up, consider falling back to creating a URL with
  /// > [URL.createObjectURL_static] and assigning it to [HTMLMediaElement.src]
  /// > (see below for an example). In addition, as of version 108 Chromium
  /// > supports attaching a dedicated worker `MediaSource` object by assigning
  /// > that object's [MediaSourceHandle] instance (transferred from the worker)
  /// > to `srcObject`.
  external MediaProvider? get srcObject;
  external set srcObject(MediaProvider? value);

  /// The **`HTMLMediaElement.currentSrc`** property contains the
  /// absolute URL of the chosen media resource. This could happen, for example,
  /// if the web
  /// server selects a media file based on the resolution of the user's display.
  /// The value
  /// is an empty string if the `networkState` property is `EMPTY`.
  external String get currentSrc;

  /// The **`HTMLMediaElement.crossOrigin`** property is the CORS setting for
  /// this media element. See
  /// [CORS settings attributes](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/crossorigin)
  /// for details.
  external String? get crossOrigin;
  external set crossOrigin(String? value);

  /// The
  /// **`HTMLMediaElement.networkState`** property indicates the
  /// current state of the fetching of media over the network.
  external int get networkState;

  /// The **`preload`** property of the [HTMLMediaElement] interface is a string
  /// that provides a hint to the browser about what the author thinks will lead
  /// to the best user experience.
  ///
  /// It reflects the `preload` attribute of the `audio` element and the `video`
  /// element.
  external String get preload;
  external set preload(String value);

  /// The **`buffered`** read-only property of [HTMLMediaElement] objects
  /// returns a new static
  /// [normalized `TimeRanges` object](https://developer.mozilla.org/en-US/docs/Web/API/TimeRanges#normalized_timeranges_objects)
  /// that represents the ranges of the media resource, if any, that the user
  /// agent has buffered at the moment the `buffered` property is accessed.
  external TimeRanges get buffered;

  /// The **`HTMLMediaElement.readyState`** property indicates the
  /// readiness state of the media.
  external int get readyState;
  external bool get seeking;

  /// The [HTMLMediaElement] interface's
  /// **`currentTime`** property specifies the current playback time
  /// in seconds.
  ///
  /// Changing the value of `currentTime` seeks the media to
  /// the new time.
  external double get currentTime;
  external set currentTime(num value);

  /// The _read-only_ [HTMLMediaElement]
  /// property **`duration`** indicates the length of the element's
  /// media in seconds.
  external double get duration;

  /// The read-only **`HTMLMediaElement.paused`** property
  /// tells whether the media element is paused.
  external bool get paused;

  /// The **`HTMLMediaElement.defaultPlaybackRate`** property indicates the
  /// default playback rate for the media.
  external double get defaultPlaybackRate;
  external set defaultPlaybackRate(num value);

  /// The **`HTMLMediaElement.playbackRate`** property sets the rate at which
  /// the media is being played back. This is used to implement user controls
  /// for fast forward, slow motion, and so forth. The normal playback rate is
  /// multiplied by this value to obtain the current rate, so a value of 1.0
  /// indicates normal speed.
  ///
  /// A negative `playbackRate` value indicates that the media should be played
  /// backwards, but support for this is not yet widespread.[1](#see-also)
  ///
  /// The audio is muted when the fast forward or slow motion is outside a
  /// useful range (for example, Gecko mutes the sound outside the range `0.25`
  /// to `4.0`).
  ///
  /// The pitch of the audio is corrected by default. You can disable pitch
  /// correction using the [HTMLMediaElement.preservesPitch] property.
  external double get playbackRate;
  external set playbackRate(num value);

  /// The **`HTMLMediaElement.preservesPitch`** property determines whether or
  /// not the browser should adjust the pitch of the audio to compensate for
  /// changes to the playback rate made by setting
  /// [HTMLMediaElement.playbackRate].
  external bool get preservesPitch;
  external set preservesPitch(bool value);
  external TimeRanges get played;

  /// The **`seekable`** read-only property of [HTMLMediaElement] objects
  /// returns a new static
  /// [normalized `TimeRanges` object](https://developer.mozilla.org/en-US/docs/Web/API/TimeRanges#normalized_timeranges_objects)
  /// that represents the ranges of the media resource, if any, that the user
  /// agent is able to seek to at the time `seekable` property is accessed.
  external TimeRanges get seekable;

  /// The **`HTMLMediaElement.ended`** property indicates whether the media
  /// element has ended playback.
  external bool get ended;

  /// The **`HTMLMediaElement.autoplay`**
  /// property reflects the
  /// [`autoplay`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/video#autoplay)
  /// HTML attribute, indicating
  /// whether playback should automatically begin as soon as enough media is
  /// available to do
  /// so without interruption.
  ///
  /// A media element whose source is a [MediaStream] and whose
  /// `autoplay` property is `true` will begin playback when it becomes
  /// active (that is, when [MediaStream.active] becomes `true`).
  ///
  /// > **Note:** Sites which automatically play audio (or videos with an audio
  /// > track) can be an unpleasant experience for users, so it should be
  /// > avoided when
  /// > possible. If you must offer autoplay functionality, you should make it
  /// > opt-in
  /// > (requiring a user to specifically enable it). However, autoplay can be
  /// > useful when
  /// > creating media elements whose source will be set at a later time, under
  /// > user control.
  ///
  /// For a much more in-depth look at autoplay, autoplay blocking, and how to
  /// respond when
  /// autoplay is blocked by the user's browser, see our article
  /// [Autoplay guide for media and Web Audio APIs](https://developer.mozilla.org/en-US/docs/Web/Media/Autoplay_guide).
  external bool get autoplay;
  external set autoplay(bool value);

  /// The **`HTMLMediaElement.loop`** property reflects the
  /// [`loop`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/video#loop)
  /// HTML attribute, which controls whether the media element should start over
  /// when it reaches the end.
  external bool get loop;
  external set loop(bool value);

  /// The **`HTMLMediaElement.controls`** property reflects the
  /// [`controls`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/video#controls)
  /// HTML attribute, which controls whether user
  /// interface controls for playing the media item will be displayed.
  external bool get controls;
  external set controls(bool value);

  /// The **`HTMLMediaElement.volume`** property sets the volume at
  /// which the media will be played.
  external double get volume;
  external set volume(num value);

  /// The **`HTMLMediaElement.muted`** property indicates whether the media
  /// element is muted.
  external bool get muted;
  external set muted(bool value);

  /// The **`HTMLMediaElement.defaultMuted`** property reflects the
  /// [`muted`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/video#muted)
  /// HTML attribute, which indicates whether the media element's audio output
  /// should be muted by default. This property has no dynamic effect. To mute
  /// and unmute the audio output, use the [HTMLMediaElement.muted] property.
  external bool get defaultMuted;
  external set defaultMuted(bool value);

  /// The read-only **`audioTracks`**
  /// property on [HTMLMediaElement] objects returns
  /// an [AudioTrackList] object listing all of the [AudioTrack]
  /// objects representing the media element's audio tracks.
  ///
  /// The media element may be
  /// either an `audio` element or a `video` element.
  ///
  /// The returned list is _live_; that is, as tracks are added to and removed
  /// from
  /// the media element, the list's contents change dynamically. Once you have a
  /// reference to
  /// the list, you can monitor it for changes to detect when new audio tracks
  /// are added or
  /// existing ones removed. See
  /// [AudioTrackList events](https://developer.mozilla.org/en-US/docs/Web/API/AudioTrackList#events)
  /// to learn more about watching for changes to a media element's track list.
  external AudioTrackList get audioTracks;

  /// The read-only **`videoTracks`**
  /// property on [HTMLMediaElement] objects returns a
  /// [VideoTrackList] object listing all of the [VideoTrack]
  /// objects representing the media element's video tracks.
  ///
  /// The returned list is _live_; that is, as tracks are added to and removed
  /// from
  /// the media element, the list's contents change dynamically. Once you have a
  /// reference to
  /// the list, you can monitor it for changes to detect when new video tracks
  /// are added or
  /// existing ones removed. See
  /// [VideoTrackList events](https://developer.mozilla.org/en-US/docs/Web/API/VideoTrackList#events)
  /// to learn more about watching for changes to a media element's track list.
  external VideoTrackList get videoTracks;

  /// The read-only **`textTracks`**
  /// property on [HTMLMediaElement] objects returns a
  /// [TextTrackList] object listing all of the [TextTrack]
  /// objects representing the media element's text tracks, in the same order as
  /// in
  /// the list of text tracks.
  ///
  /// You can detect when tracks are added to and removed from an
  /// [`<audio>`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/audio)
  /// or
  /// [`<video>`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/video)
  /// element
  /// using the `addtrack` and `removetrack` events. However, these
  /// events aren't sent directly to the media element itself. Instead, they're
  /// sent to the
  /// track list object of the
  /// [`HTMLMediaElement`](https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement)
  /// that corresponds to the type of track that was added to the element
  ///
  /// The returned list is _live_; that is, as tracks are added to and removed
  /// from
  /// the media element, the list's contents change dynamically. Once you have a
  /// reference to
  /// the list, you can monitor it for changes to detect when new text tracks
  /// are added or
  /// existing ones removed.
  ///
  /// See
  /// [TextTrackList events](https://developer.mozilla.org/en-US/docs/Web/API/TextTrackList#events)
  /// to learn
  /// more about watching for changes to a media element's track list.
  external TextTrackList get textTracks;

  /// The **`HTMLMediaElement.sinkId`** read-only property of the
  /// [Audio Output Devices API](https://developer.mozilla.org/en-US/docs/Web/API/Audio_Output_Devices_API)
  /// returns a string that is the unique ID of the device to be used for
  /// playing audio output.
  ///
  /// This ID should be one of the [MediaDeviceInfo.deviceId] values returned
  /// from [MediaDevices.enumerateDevices], `id-multimedia`, or
  /// `id-communications`.
  /// If the user agent default device is being used, it returns an empty
  /// string.
  external String get sinkId;

  /// The read-only **`HTMLMediaElement.mediaKeys`** property returns a
  /// [MediaKeys] object, that is a set of keys that the element can use for
  /// decryption of media data during playback.
  external MediaKeys? get mediaKeys;
  external EventHandler get onencrypted;
  external set onencrypted(EventHandler value);
  external EventHandler get onwaitingforkey;
  external set onwaitingforkey(EventHandler value);

  /// The **`remote`** read-only property of the [HTMLMediaElement] interface
  /// returns the [RemotePlayback] object associated with the media element. The
  /// `RemotePlayback` object allow the control of remote devices playing the
  /// media.
  external RemotePlayback get remote;

  /// The **`disableRemotePlayback`** property of the [HTMLMediaElement]
  /// interface determines whether the media element is allowed to have a remote
  /// playback UI.
  external bool get disableRemotePlayback;
  external set disableRemotePlayback(bool value);
}

/// The **`MediaError`** interface represents an error which occurred while
/// handling media in an HTML media element based on [HTMLMediaElement], such as
/// `audio` or `video`.
///
/// A `MediaError` object describes the error in general terms using a numeric
/// `code` categorizing the kind of error, and a `message`, which provides
/// specific diagnostics about what went wrong.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/MediaError).
extension type MediaError._(JSObject _) implements JSObject {
  static const int MEDIA_ERR_ABORTED = 1;

  static const int MEDIA_ERR_NETWORK = 2;

  static const int MEDIA_ERR_DECODE = 3;

  static const int MEDIA_ERR_SRC_NOT_SUPPORTED = 4;

  /// The read-only property **`MediaError.code`** returns a numeric
  /// value which represents the kind of error that occurred on a media element.
  /// To get a text
  /// string with specific diagnostic information, see [MediaError.message].
  external int get code;

  /// The read-only property **`MediaError.message`** returns a
  /// human-readable string offering specific
  /// diagnostic details related to the error described by the `MediaError`
  /// object,
  /// or an empty string (`""`) if no diagnostic information can be determined
  /// or
  /// provided.
  external String get message;
}

/// The **`AudioTrackList`** interface is used to represent a list of the audio
/// tracks contained within a given HTML media element, with each track
/// represented by a separate [AudioTrack] object in the list.
///
/// Retrieve an instance of this object with [HTMLMediaElement.audioTracks]. The
/// individual tracks can be accessed using array syntax.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/AudioTrackList).
extension type AudioTrackList._(JSObject _) implements EventTarget, JSObject {
  external AudioTrack operator [](int index);

  /// The **[AudioTrackList]** method **`getTrackById()`** returns the first
  /// [AudioTrack] object from the track list whose [AudioTrack.id] matches the
  /// specified string.
  /// This lets you find a specified track if you know its ID string.
  external AudioTrack? getTrackById(String id);

  /// The read-only **[AudioTrackList]**
  /// property **`length`** returns the number of entries in the
  /// `AudioTrackList`, each of which is an [AudioTrack]
  /// representing one audio track in the media element. A value of 0 indicates
  /// that
  /// there are no audio tracks in the media.
  external int get length;
  external EventHandler get onchange;
  external set onchange(EventHandler value);
  external EventHandler get onaddtrack;
  external set onaddtrack(EventHandler value);
  external EventHandler get onremovetrack;
  external set onremovetrack(EventHandler value);
}

/// The **`AudioTrack`** interface represents a single audio track from one of
/// the HTML media elements, `audio` or `video`.
///
/// The most common use for accessing an `AudioTrack` object is to toggle its
/// [AudioTrack.enabled] property in order to mute and unmute the track.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/AudioTrack).
extension type AudioTrack._(JSObject _) implements JSObject {
  /// The **`id`** property contains a
  /// string which uniquely identifies the track represented by the
  /// **[AudioTrack]**.
  ///
  /// This ID can be used with the
  /// [AudioTrackList.getTrackById] method to locate a specific track within
  /// the media associated with a media element. The track ID can also be used
  /// as the fragment of a URL that loads the specific track
  /// (if the media supports media fragments).
  external String get id;

  /// The **`kind`** property contains a
  /// string indicating the category of audio contained in the
  /// **[AudioTrack]**.
  ///
  /// The `kind` can be used
  /// to determine the scenarios in which specific tracks should be enabled or
  /// disabled. See
  /// [Audio track kind strings](#audio_track_kind_strings) for a list of the
  /// kinds available for audio tracks.
  external String get kind;

  /// The read-only **[AudioTrack]**
  /// property **`label`** returns a string specifying the audio
  /// track's human-readable label, if one is available; otherwise, it returns
  /// an empty
  /// string.
  external String get label;

  /// The read-only **[AudioTrack]**
  /// property **`language`** returns a string identifying the
  /// language used in the audio track.
  ///
  /// For tracks that include multiple languages
  /// (such as a movie in English in which a few lines are spoken in other
  /// languages), this
  /// should be the video's primary language.
  external String get language;

  /// The **[AudioTrack]** property
  /// **`enabled`** specifies whether or not the described audio
  /// track is currently enabled for use. If the track is disabled by setting
  /// `enabled` to `false`, the track is muted and does not produce
  /// audio.
  external bool get enabled;
  external set enabled(bool value);

  /// The read-only **[AudioTrack]**
  /// property **`sourceBuffer`** returns the
  /// [SourceBuffer] that created the track, or null if the track was not
  /// created by a [SourceBuffer] or the [SourceBuffer] has been
  /// removed from the [MediaSource.sourceBuffers] attribute of its parent
  /// media source.
  external SourceBuffer? get sourceBuffer;
}

/// The **`VideoTrackList`** interface is used to represent a list of the video
/// tracks contained within a `video` element, with each track represented by a
/// separate [VideoTrack] object in the list.
///
/// Retrieve an instance of this object with [HTMLMediaElement.videoTracks]. The
/// individual tracks can be accessed using array syntax or functions such as
/// `forEach()` for example.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/VideoTrackList).
extension type VideoTrackList._(JSObject _) implements EventTarget, JSObject {
  external VideoTrack operator [](int index);

  /// The **[VideoTrackList]** method
  /// **`getTrackById()`** returns the first
  /// [VideoTrack] object from the track list whose [VideoTrack.id] matches the
  /// specified string.
  ///
  /// This lets you find a specified track if
  /// you know its ID string.
  external VideoTrack? getTrackById(String id);

  /// The read-only **[VideoTrackList]**
  /// property **`length`** returns the number of entries in the
  /// `VideoTrackList`, each of which is a [VideoTrack] representing
  /// one video track in the media element.
  ///
  /// A value of 0 indicates that there are no
  /// video tracks in the media.
  external int get length;

  /// The read-only **[VideoTrackList]**
  /// property **`selectedIndex`** returns the index of the
  /// currently selected track, if any, or `-1` otherwise.
  external int get selectedIndex;
  external EventHandler get onchange;
  external set onchange(EventHandler value);
  external EventHandler get onaddtrack;
  external set onaddtrack(EventHandler value);
  external EventHandler get onremovetrack;
  external set onremovetrack(EventHandler value);
}

/// The [VideoTrack] interface represents a single video track from a `video`
/// element.
///
/// The most common use for accessing a `VideoTrack` object is to toggle its
/// [VideoTrack.selected] property in order to make it the active video track
/// for its `video` element.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/VideoTrack).
extension type VideoTrack._(JSObject _) implements JSObject {
  /// The **`id`** property contains a
  /// string which uniquely identifies the track represented by the
  /// **[VideoTrack]**.
  ///
  /// This ID can be used with the
  /// [VideoTrackList.getTrackById] method to locate a specific track within
  /// the media associated with a media element.
  ///
  /// The track ID can also be used as the fragment of a URL that loads the
  /// specific track
  /// (if the media supports media fragments).
  external String get id;

  /// The **`kind`** property contains a
  /// string indicating the category of video contained in the
  /// **[VideoTrack]**.
  ///
  /// The `kind` can be used
  /// to determine the scenarios in which specific tracks should be enabled or
  /// disabled. See
  /// [Video track kind strings](#video_track_kind_strings) for a list of the
  /// kinds available for video tracks.
  external String get kind;

  /// The read-only **[VideoTrack]**
  /// property **`label`** returns a string specifying the video
  /// track's human-readable label, if one is available; otherwise, it returns
  /// an empty
  /// string.
  external String get label;

  /// The read-only **[VideoTrack]**
  /// property **`language`** returns a string identifying the
  /// language used in the video track.
  ///
  /// For tracks that include multiple languages
  /// (such as a movie in English in which a few lines are spoken in other
  /// languages), this
  /// should be the video's primary language.
  external String get language;

  /// The **[VideoTrack]** property
  /// **`selected`** controls whether or not a particular video
  /// track is active.
  external bool get selected;
  external set selected(bool value);

  /// The read-only **[VideoTrack]**
  /// property **`sourceBuffer`** returns the
  /// [SourceBuffer] that created the track, or null if the track was not
  /// created by a [SourceBuffer] or the [SourceBuffer] has been
  /// removed from the [MediaSource.sourceBuffers] attribute of its parent
  /// media source.
  external SourceBuffer? get sourceBuffer;
}

/// The **`TextTrackList`** interface is used to represent a list of the text
/// tracks defined by the `track` element, with each track represented by a
/// separate [textTrack] object in the list.
///
/// Retrieve an instance of this object with the [HTMLMediaElement.textTracks]
/// property of an [HTMLMediaElement] object.
///
/// For a given [HTMLMediaElement] object _media_, the individual tracks can be
/// accessed using:
///
/// - `media.TextTracks[n]`, to get the n-th text track from the object's list
///   of text tracks
///
/// - the
///   `media.textTracks`.[`getTrackById()`](https://developer.mozilla.org/en-US/docs/Web/API/TextTrackList/getTrackById)
///   method
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/TextTrackList).
extension type TextTrackList._(JSObject _) implements EventTarget, JSObject {
  external TextTrack operator [](int index);

  /// The **[TextTrackList]** method
  /// **`getTrackById()`** returns the first
  /// [TextTrack] object from the track list whose
  /// [`id`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/id)
  /// matches the
  /// specified string. This lets you find a specified track if you know its ID
  /// string.
  external TextTrack? getTrackById(String id);

  /// The read-only **[TextTrackList]**
  /// property **`length`** returns the number of entries in the
  /// `TextTrackList`, each of which is a [TextTrack] representing
  /// one track in the media element.
  ///
  /// A value of 0 indicates that there are no text
  /// tracks in the media.
  external int get length;
  external EventHandler get onchange;
  external set onchange(EventHandler value);
  external EventHandler get onaddtrack;
  external set onaddtrack(EventHandler value);
  external EventHandler get onremovetrack;
  external set onremovetrack(EventHandler value);
}

/// The `TextTrack` interface—part of the API for handling WebVTT (text tracks
/// on media presentations)—describes and controls the text track associated
/// with a particular `track` element.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/TextTrack).
extension type TextTrack._(JSObject _) implements EventTarget, JSObject {
  /// The **`addCue()`** method of the [TextTrack] interface adds a new cue to
  /// the list of cues.
  external void addCue(TextTrackCue cue);

  /// The **`removeCue()`** method of the [TextTrack] interface removes a cue
  /// from the list of cues.
  external void removeCue(TextTrackCue cue);

  /// The **`kind`** read-only property of the [TextTrack] interface returns the
  /// kind of text track this object represents. This decides how the track will
  /// be handled by a user agent.
  external TextTrackKind get kind;

  /// The **`label`** read-only property of the [TextTrack] interface returns a
  /// human-readable label for the text track, if it is available.
  external String get label;

  /// The **`language`** read-only property of the [TextTrack] interface returns
  /// the language of the text track.
  ///
  /// This uses the same values as the HTML
  /// [`lang`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes#lang)
  /// attribute. These values are documented in `5646, "Tags for Identifying
  /// Languages (also known as BCP 47)"`.
  external String get language;

  /// The **`id`** read-only property of the [TextTrack] interface returns the
  /// ID of the track if it has one.
  external String get id;

  /// The **`inBandMetadataTrackDispatchType`** read-only property of the
  /// [TextTrack] interface returns the text track's in-band metadata dispatch
  /// type of the text track represented by the [TextTrack] object.
  ///
  /// An in-band metadata dispatch type is a string extracted from a media
  /// resource specifically for in-band metadata tracks. An example of a media
  /// resource that might have such tracks is a TV station streaming a broadcast
  /// on the web. Text Tracks may be used to include metadata for ad targeting,
  /// additional information such as recipe data during a cooking show, or
  /// trivia game data during a game show.
  ///
  /// The value of this attribute could be used to attach these tracks to
  /// dedicated script modules as they are loaded.
  external String get inBandMetadataTrackDispatchType;

  /// The [TextTrack] interface's
  /// **`mode`** property is a string specifying and controlling the
  /// text track's mode: `disabled`, `hidden`, or
  /// `showing`. You can read this value to determine the current mode,
  /// and you can change this value to switch modes.
  ///
  /// Safari additionally requires the **`default`**
  /// boolean attribute to be set to true when implementing your own video
  /// player controls in
  /// order for the subtitles cues to be shown.
  ///
  /// ### Value
  ///
  /// A string which indicates the track's current mode. One of:
  ///
  /// - `disabled`
  ///   - : The text track is currently disabled. While the track's presence is exposed in the
  /// DOM, the user agent is otherwise ignoring it. No cues are active, no
  /// events are being
  /// fired, and the user agent won't attempt to obtain the track's cues. This
  /// is the
  /// default value, unless the text track has the
  /// [`default`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/track#default)
  /// Boolean attribute is specified, in which case the default is `showing`.
  /// - `hidden`
  ///   - : The text track is currently active but the cues aren't being displayed. If the user
  /// agent hasn't tried to obtain the track's cues yet, it will do so soon
  /// (thereby
  /// populating the track's [TextTrack.cues] property). The user agent is
  /// keeping a list of the active cues (in the track's [TextTrack.activeCues]
  /// property) and events are being fired at the corresponding times, even
  /// though the text isn't being displayed.
  /// - `showing`
  ///   - : The text track is currently enabled and is visible. If the track's cues list hasn't
  /// been obtained yet, it will be soon. The [TextTrack.activeCues]
  /// list is being maintained and events are firing at the appropriate
  /// times; the track's text is also being drawn appropriately based on the
  /// styling and the
  /// track's [TextTrack.kind]. This is the default value if the text
  /// track's
  /// [`default`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/track#default)
  /// Boolean attribute is specified.
  external TextTrackMode get mode;
  external set mode(TextTrackMode value);

  /// The **`cues`** read-only property of the [TextTrack] interface returns a
  /// [TextTrackCueList] object containing all of the track's cues.
  external TextTrackCueList? get cues;

  /// The **`activeCues`** read-only property of the [TextTrack] interface
  /// returns a [TextTrackCueList] object listing the currently active cues.
  external TextTrackCueList? get activeCues;
  external EventHandler get oncuechange;
  external set oncuechange(EventHandler value);
  external SourceBuffer? get sourceBuffer;
}

/// The **`TextTrackCueList`** array-like object represents a dynamically
/// updating list of [TextTrackCue] objects.
///
/// This interface has no constructor. Retrieve an instance of this object with
/// [TextTrack.cues] which returns all of the cues in a [TextTrack] object.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/TextTrackCueList).
extension type TextTrackCueList._(JSObject _) implements JSObject {
  external TextTrackCue operator [](int index);

  /// The **`getCueById()`** method of the [TextTrackCueList] interface returns
  /// the first [VTTCue] in the list represented by the `TextTrackCueList`
  /// object whose identifier matches the value of `id`.
  external TextTrackCue? getCueById(String id);

  /// The **`length`** read-only property of the [TextTrackCueList] interface
  /// returns the number of cues in the list.
  external int get length;
}

/// **`TextTrackCue`** is an abstract class which is used as the basis for the
/// various derived cue types, such as [VTTCue]; you will instead work with
/// those derived types. These cues represent strings of text presented for some
/// duration of time during the performance of a [TextTrack]. The cue includes
/// the start time (the time at which the text will be displayed) and the end
/// time (the time at which it will be removed from the display), as well as
/// other information.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/TextTrackCue).
extension type TextTrackCue._(JSObject _) implements EventTarget, JSObject {
  /// The **`track`** read-only property of the [TextTrackCue] interface returns
  /// the [TextTrack] object that this cue belongs to.
  external TextTrack? get track;

  /// The **`id`** property of the [TextTrackCue] interface returns and sets the
  /// identifier for this cue.
  external String get id;
  external set id(String value);

  /// The **`startTime`** property of the [TextTrackCue] interface returns and
  /// sets the start time of the cue.
  external double get startTime;
  external set startTime(num value);

  /// The **`endTime`** property of the [TextTrackCue] interface returns and
  /// sets the end time of the cue.
  external double get endTime;
  external set endTime(num value);

  /// The **`pauseOnExit`** property of the [TextTrackCue] interface returns or
  /// sets the flag indicating whether playback of the media should pause when
  /// the end of the range to which this cue applies is reached.
  external bool get pauseOnExit;
  external set pauseOnExit(bool value);
  external EventHandler get onenter;
  external set onenter(EventHandler value);
  external EventHandler get onexit;
  external set onexit(EventHandler value);
}

/// When loading a media resource for use by an `audio` or `video` element, the
/// **`TimeRanges`** interface is used for representing the time ranges of the
/// media resource that have been buffered, the time ranges that have been
/// played, and the time ranges that are seekable.
///
/// A `TimeRanges` object includes one or more ranges of time, each specified by
/// a starting time offset and an ending time offset. You reference each time
/// range by using the `start()` and `end()` methods, passing the index number
/// of the time range you want to retrieve.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/TimeRanges).
extension type TimeRanges._(JSObject _) implements JSObject {
  /// The **`start()`** method of the [TimeRanges] interface returns the time
  /// offset at which a specified time range begins.
  external double start(int index);

  /// The **`end()`** method of the [TimeRanges] interface returns the time
  /// offset at which a specified time range ends.
  external double end(int index);

  /// The **`TimeRanges.length`** read-only property returns the
  /// number of ranges in the object.
  external int get length;
}

/// The **`TrackEvent`** interface, which is part of the HTML DOM specification,
/// is used for events which represent changes to a set of available tracks on
/// an HTML media element; these events are `addtrack` and `removetrack`.
///
/// It's important not to confuse `TrackEvent` with the [RTCTrackEvent]
/// interface, which is used for tracks which are part of an
/// [RTCPeerConnection].
///
/// Events based on `TrackEvent` are always sent to one of the media track list
/// types:
///
/// - Events involving video tracks are always sent to the [VideoTrackList]
///   found in [HTMLMediaElement.videoTracks]
/// - Events involving audio tracks are always sent to the [AudioTrackList]
///   specified in [HTMLMediaElement.audioTracks]
/// - Events affecting text tracks are sent to the [TextTrackList] object
///   indicated by [HTMLMediaElement.textTracks].
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/TrackEvent).
extension type TrackEvent._(JSObject _) implements Event, JSObject {
  external factory TrackEvent(
    String type, [
    TrackEventInit eventInitDict,
  ]);

  /// The read-only **`track`** property of
  /// the [TrackEvent] interface specifies the media track object to which the
  /// event applies.
  ///
  /// The media track will be an [AudioTrack],
  /// [VideoTrack], or [TextTrack] object.
  external JSObject? get track;
}
extension type TrackEventInit._(JSObject _) implements EventInit, JSObject {
  external factory TrackEventInit({
    bool bubbles,
    bool cancelable,
    bool composed,
    JSObject? track,
  });

  external JSObject? get track;
  external set track(JSObject? value);
}

/// The **`HTMLMapElement`** interface provides special properties and methods
/// (beyond those of the regular object [HTMLElement] interface it also has
/// available to it by inheritance) for manipulating the layout and presentation
/// of map elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLMapElement).
extension type HTMLMapElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLMapElement] using the tag 'map'.
  HTMLMapElement() : _ = document.createElement('map');

  /// The **`name`** property of the [HTMLMapElement] represents the unique name
  /// `<map>` element.
  /// Its value can be used with the `useMap` attribute of the `img` element to
  /// reference a `<map>` element.
  ///
  /// If an `id` attribute is set on the `map` element, then this `name`
  /// property should be the same as this `id`.
  external String get name;
  external set name(String value);
  external HTMLCollection get areas;
}

/// The **`HTMLAreaElement`** interface provides special properties and methods
/// (beyond those of the regular object [HTMLElement] interface it also has
/// available to it by inheritance) for manipulating the layout and presentation
/// of `area` elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLAreaElement).
extension type HTMLAreaElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLAreaElement] using the tag 'area'.
  HTMLAreaElement() : _ = document.createElement('area');

  external String get alt;
  external set alt(String value);
  external String get coords;
  external set coords(String value);
  external String get shape;
  external set shape(String value);

  /// The **`target`** property of the [HTMLAreaElement] interface is a string
  /// that indicates where to display the linked resource.
  ///
  /// It reflects the
  /// [`target`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/area#target)
  /// attribute of the `area` element.
  external String get target;
  external set target(String value);
  external String get download;
  external set download(String value);

  /// The **`ping`** property of the [HTMLAreaElement] interface is a
  /// space-separated list of URLs. When the link is followed, the browser will
  /// send `POST` requests with the body PING to the URLs.
  ///
  /// It reflects the `ping` attribute of the `area` element.
  ///
  /// > **Note:** This property is not effective in Firefox and its usage may be
  /// > limited due to privacy and security concerns.
  external String get ping;
  external set ping(String value);

  /// The **`HTMLAreaElement.rel`** property reflects the
  /// [`rel`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/rel)
  /// attribute. It is a string containing a space-separated list of link types
  /// indicating the relationship between the resource represented by the `area`
  /// element and the current document.
  external String get rel;
  external set rel(String value);

  /// The **`HTMLAreaElement.relList`** read-only property reflects the
  /// [`rel`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/rel)
  /// attribute. It is a live [DOMTokenList] containing the set of link types
  /// indicating the relationship between the resource represented by the `area`
  /// element and the current document.
  ///
  /// The property itself is read-only, meaning you can't substitute the
  /// [DOMTokenList] by another one, but the content of the returned list can be
  /// changed.
  external DOMTokenList get relList;

  /// The
  /// **`HTMLAreaElement.referrerPolicy`**
  /// property reflect the HTML
  /// [`referrerpolicy`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/area#referrerpolicy)
  /// attribute of the
  /// `area` element defining which referrer is sent when fetching the
  /// resource.
  external String get referrerPolicy;
  external set referrerPolicy(String value);
  external bool get noHref;
  external set noHref(bool value);

  /// The **`HTMLAreaElement.href`** property is a
  /// that returns a string containing the whole URL, and allows
  /// the href to be updated.
  external String get href;
  external set href(String value);

  /// The
  /// **`HTMLAreaElement.origin`** read-only property is a
  /// string containing the Unicode serialization of the origin of the
  /// represented URL.
  ///
  /// That is:
  ///
  /// - for URL using the `http` or `https`, the scheme followed by
  /// `'://'`, followed by the domain, followed by `':'`, followed by
  /// the port (the default port, `80` and `443` respectively, if
  /// explicitly specified);
  /// - for URL using `file:` scheme, the value is browser dependent;
  /// - for URL using the `blob:` scheme, the origin of the URL following
  /// `blob:`. E.g `"blob:https://mozilla.org"` will have
  /// `"https://mozilla.org".`
  external String get origin;

  /// The
  /// **`HTMLAreaElement.protocol`**
  /// property is a string representing the protocol scheme of the URL,
  /// including the final `':'`.
  external String get protocol;
  external set protocol(String value);

  /// The **`HTMLAreaElement.username`** property is a
  /// string containing the username specified before the domain name.
  external String get username;
  external set username(String value);

  /// The **`HTMLAreaElement.password`** property is a
  /// string containing the password specified before the domain name.
  ///
  /// If it is set without first setting the
  /// [`username`](https://developer.mozilla.org/en-US/docs/Web/API/HTMLAreaElement/username)
  /// property, it silently fails.
  external String get password;
  external set password(String value);

  /// The **`HTMLAreaElement.host`** property is a
  /// string containing the host, that is the _hostname_, and then,
  /// if the _port_ of the URL is nonempty, a `':'`, and the _port_
  /// of the URL.
  external String get host;
  external set host(String value);

  /// The **`HTMLAreaElement.hostname`** property is a string containing the
  /// domain of the URL.
  external String get hostname;
  external set hostname(String value);

  /// The **`HTMLAreaElement.port`** property is a
  /// string containing the port number of the URL. If the URL does not
  /// contain an explicit port number, it will be set to `''`.
  external String get port;
  external set port(String value);

  /// The **`HTMLAreaElement.pathname`** property is a
  /// string containing an initial `'/'` followed by the path of
  /// the URL not including the query string or fragment (or the empty string if
  /// there is no
  /// path).
  external String get pathname;
  external set pathname(String value);

  /// The **`HTMLAreaElement.search`** property is a search
  /// string, also called a _query string_, that is a string containing
  /// a `'?'` followed by the parameters of the URL.
  ///
  /// Modern browsers provide
  /// [`URLSearchParams`](https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams/get#examples)
  /// and
  /// [`URL.searchParams`](/en-US/docs/Web/API/URL/searchParams#examples)
  /// to make it easy to parse out the parameters from the querystring.
  external String get search;
  external set search(String value);

  /// The
  /// **`HTMLAreaElement.hash`** property returns a
  /// string containing a `'#'` followed by the fragment
  /// identifier of the URL.
  ///
  /// The fragment is not
  /// [URL decoded](https://en.wikipedia.org/wiki/URL_encoding). If the URL does
  /// not
  /// have a fragment identifier, this property contains an empty string, `""`.
  external String get hash;
  external set hash(String value);
}

/// The **`HTMLTableElement`** interface provides special properties and methods
/// (beyond the regular [HTMLElement] object interface it also has available to
/// it by inheritance) for manipulating the layout and presentation of tables in
/// an HTML document.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLTableElement).
extension type HTMLTableElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLTableElement] using the tag 'table'.
  HTMLTableElement() : _ = document.createElement('table');

  /// The **`HTMLTableElement.createCaption()`** method returns the
  /// `caption` element associated with a given `table`.
  /// If no `<caption>` element exists on the table, this method creates
  /// it, and then returns it.
  ///
  /// > **Note:** If no caption exists, `createCaption()` inserts a
  /// > new caption directly into the table. The caption does not need to be
  /// > added
  /// > separately as would be the case if [Document.createElement] had
  /// > been used to create the new `<caption>` element.
  external HTMLTableCaptionElement createCaption();

  /// The **`HTMLTableElement.deleteCaption()`** method removes the
  /// `caption` element from a given `table`. If there is no
  /// `<caption>` element associated with the table, this method does
  /// nothing.
  external void deleteCaption();

  /// The **`createTHead()`** method of
  /// [HTMLTableElement] objects returns the `thead` element
  /// associated with a given `table`. If no header exists in the table, this
  /// method creates it, and then returns it.
  ///
  /// > **Note:** If no header exists, `createTHead()` inserts a new
  /// > header directly into the table. The header does not need to be added
  /// > separately as
  /// > would be the case if [Document.createElement] had been used to create
  /// > the new `<thead>` element.
  external HTMLTableSectionElement createTHead();

  /// The **`HTMLTableElement.deleteTHead()`** removes the
  /// `thead` element from a given `table`.
  external void deleteTHead();

  /// The **`createTFoot()`** method of
  /// [HTMLTableElement] objects returns the `tfoot` element
  /// associated with a given `table`. If no footer exists in the table, this
  /// method creates it, and then returns it.
  ///
  /// > **Note:** If no footer exists, `createTFoot()` inserts a new
  /// > footer directly into the table. The footer does not need to be added
  /// > separately as
  /// > would be the case if [Document.createElement] had been used to create
  /// > the new `<tfoot>` element.
  external HTMLTableSectionElement createTFoot();

  /// The **`HTMLTableElement.deleteTFoot()`** method removes the
  /// `tfoot` element from a given `table`.
  external void deleteTFoot();

  /// The **`createTBody()`** method of
  /// [HTMLTableElement] objects creates and returns a new
  /// `tbody` element associated with a given `table`.
  ///
  /// > **Note:** Unlike [HTMLTableElement.createTHead] and
  /// > [HTMLTableElement.createTFoot], `createTBody()`
  /// > systematically creates a new `<tbody>` element, even if the table
  /// > already contains one or more bodies. If so, the new one is inserted
  /// > after the existing
  /// > ones.
  external HTMLTableSectionElement createTBody();

  /// The **`insertRow()`** method of the [HTMLTableElement] interface inserts a
  /// new row
  /// (`tr`) in a given `table`, and returns a reference to
  /// the new row.
  ///
  /// If a table has multiple `tbody` elements, by default, the new row is
  /// inserted into the last `<tbody>`.
  /// To insert the row into a specific section, use
  /// [HTMLTableSectionElement.insertRow]
  ///
  /// > **Note:** `insertRow()` inserts the row directly into the
  /// > table. The row does not need to be appended separately as would be the
  /// > case if
  /// > [Document.createElement] had been used to create the new
  /// > `<tr>` element.
  external HTMLTableRowElement insertRow([int index]);

  /// The **`HTMLTableElement.deleteRow()`** method removes a
  /// specific row (`tr`) from a given `table`.
  external void deleteRow(int index);

  /// The **`HTMLTableElement.caption`** property represents the
  /// table caption. If no caption element is associated with the table, this
  /// property is
  /// `null`.
  external HTMLTableCaptionElement? get caption;
  external set caption(HTMLTableCaptionElement? value);

  /// The **`HTMLTableElement.tHead`** represents the
  /// `thead` element of a `table`. Its value will be
  /// `null` if there is no such element.
  external HTMLTableSectionElement? get tHead;
  external set tHead(HTMLTableSectionElement? value);

  /// The **`HTMLTableElement.tFoot`** property represents the
  /// `tfoot` element of a `table`. Its value will be
  /// `null` if there is no such element.
  external HTMLTableSectionElement? get tFoot;
  external set tFoot(HTMLTableSectionElement? value);

  /// The **`HTMLTableElement.tBodies`** read-only property returns a
  /// live [HTMLCollection] of the bodies in a `table`.
  ///
  /// Although the property is read-only, the returned object is live and allows
  /// the
  /// modification of its content.
  ///
  /// The collection returned includes implicit `tbody` elements. For
  /// example:
  ///
  /// ```html
  /// <table>
  ///   <tr>
  ///     <td>cell one</td>
  ///   </tr>
  /// </table>
  /// ```
  ///
  /// The HTML DOM generated from the above HTML will have a `tbody` element
  /// even though the tags are not included in the source HTML.
  external HTMLCollection get tBodies;

  /// The read-only [HTMLTableElement]
  /// property **`rows`** returns a live
  /// [HTMLCollection] of all the rows in the table, including the rows
  /// contained within any `thead`, `tfoot`, and
  /// `tbody` elements.
  ///
  /// Although the property itself is read-only, the returned object is live and
  /// allows the
  /// modification of its content.
  external HTMLCollection get rows;

  /// The **`HTMLTableElement.align`** property represents the
  /// alignment of the table.
  external String get align;
  external set align(String value);

  /// The **`HTMLTableElement.border`** property represents the
  /// border width of the `table` element.
  external String get border;
  external set border(String value);

  /// The [HTMLTableElement] interface's **`frame`**
  /// property is a string that indicates which of the table's exterior borders
  /// should be
  /// drawn.
  external String get frame;
  external set frame(String value);

  /// The **`HTMLTableElement.rules`** property indicates which cell
  /// borders to render in the table.
  external String get rules;
  external set rules(String value);

  /// The **`HTMLTableElement.summary`** property represents the
  /// table description.
  external String get summary;
  external set summary(String value);

  /// The **`HTMLTableElement.width`** property represents the
  /// desired width of the table.
  external String get width;
  external set width(String value);

  /// The **`bgcolor`** property of the [HTMLTableElement] represents the
  /// background color of the table.
  ///
  /// > **Note:** Do not use this attribute anymore. Instead, use the CSS
  /// > property by modifying the element's
  /// > [`style`](https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/style)
  /// > attribute or using a style rule.
  external String get bgColor;
  external set bgColor(String value);

  /// The **`HTMLTableElement.cellPadding`** property represents the
  /// padding around the individual cells of the table.
  external String get cellPadding;
  external set cellPadding(String value);

  /// While you should instead use the CSS
  /// property, the obsolete [HTMLTableElement]
  /// interface's **`cellSpacing`** property represents the spacing
  /// around the individual `th` and `td` elements
  /// representing a table's cells. Any two cells are separated by the sum of
  /// the
  /// `cellSpacing` of each of the two cells.
  external String get cellSpacing;
  external set cellSpacing(String value);
}

/// The **`HTMLTableCaptionElement`** interface provides special properties
/// (beyond the regular [HTMLElement] interface it also has available to it by
/// inheritance) for manipulating table `caption` elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLTableCaptionElement).
extension type HTMLTableCaptionElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLTableCaptionElement] using the tag 'caption'.
  HTMLTableCaptionElement() : _ = document.createElement('caption');

  external String get align;
  external set align(String value);
}

/// The **`HTMLTableColElement`** interface provides properties for manipulating
/// single or grouped table column elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLTableColElement).
extension type HTMLTableColElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLTableColElement] using the tag 'colgroup'.
  HTMLTableColElement.colgroup() : _ = document.createElement('colgroup');

  /// Creates an [HTMLTableColElement] using the tag 'col'.
  HTMLTableColElement.col() : _ = document.createElement('col');

  /// The **`span`** read-only property of the [HTMLTableColElement] interface
  /// represents the number of columns this `col` or `colgroup` must span; this
  /// lets the column occupy space across multiple columns of the table. It
  /// reflects the
  /// [`span`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/col#colspan)
  /// attribute.
  external int get span;
  external set span(int value);

  /// The **`align`** property of the [HTMLTableColElement] interface is a
  /// string indicating how to horizontally align text in a table `col` column
  /// element.
  ///
  /// > **Note:** This property is deprecated, and CSS should be used to align
  /// > text horizontally in a column. Use the CSS  property, which takes
  /// > precedence, to horizontally align text in a column instead.
  /// >
  /// > As `td` are not children of `col`, you can't set it directly on a `col`
  /// > element, you need to select the cells of the column using a
  /// > `td:nth-last-child(n)` or similar (`n` is the column number, counting
  /// > from the end).
  external String get align;
  external set align(String value);

  /// The **`ch`** property of the [HTMLTableColElement] interface does nothing.
  /// It reflects the `char` attribute of the `col` element.
  ///
  /// > **Note:** This property was designed to participate to the ability to
  /// > align table cell content on a specific character (typically the decimal
  /// > point), but was never implemented by browsers.
  /// >
  /// > To achieve such alignment, watch for the support of a string value with
  /// > the  CSS property.
  external String get ch;
  external set ch(String value);

  /// The **`chOff`** property of the [HTMLTableColElement] interface does
  /// nothing. It reflects the `charoff` attribute of the `col` element.
  ///
  /// > **Note:** This property was designed to participate in an ability to
  /// > align table cell content on a specific character (typically the decimal
  /// > point), but was never implemented by browsers.
  /// >
  /// > To achieve such alignment, watch for the support of a string value with
  /// > the  CSS property.
  external String get chOff;
  external set chOff(String value);

  /// The **`vAlign`** property of the [HTMLTableColElement] interface is a
  /// string indicating how to vertically align text in a table `col` column
  /// element.
  ///
  /// > **Note:** This property is deprecated, and CSS should be used to align
  /// > text vertically in a column. Use the CSS  property, which takes
  /// > precedence, to vertically align text in each column cell instead.
  /// >
  /// > As `td` are not children of `col`, you can't set it directly on a
  /// > `col`element , you need to select the cells of the column using a
  /// > `td:nth-child(n)` or similar (`n` is the column number).
  external String get vAlign;
  external set vAlign(String value);
  external String get width;
  external set width(String value);
}

/// The **`HTMLTableSectionElement`** interface provides special properties and
/// methods (beyond the [HTMLElement] interface it also has available to it by
/// inheritance) for manipulating the layout and presentation of sections, that
/// is headers, footers and bodies (`thead`, `tfoot`, and `tbody`, respectively)
/// in an HTML table.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLTableSectionElement).
extension type HTMLTableSectionElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLTableSectionElement] using the tag 'tbody'.
  HTMLTableSectionElement.tbody() : _ = document.createElement('tbody');

  /// Creates an [HTMLTableSectionElement] using the tag 'thead'.
  HTMLTableSectionElement.thead() : _ = document.createElement('thead');

  /// Creates an [HTMLTableSectionElement] using the tag 'tfoot'.
  HTMLTableSectionElement.tfoot() : _ = document.createElement('tfoot');

  /// The **`insertRow()`** method of the [HTMLTableSectionElement] interface
  /// inserts a new row
  /// (`tr`) in the given `section`, and returns a reference to
  /// this new row.
  ///
  /// > **Note:** `insertRow()` inserts the row directly into the
  /// > section. The row does not need to be appended separately as would be the
  /// > case if
  /// > [Document.createElement] had been used to create the new
  /// > `<tr>` element.
  external HTMLTableRowElement insertRow([int index]);

  /// The **`deleteRow()`** method of the [HTMLTableSectionElement] interface
  /// removes a
  /// specific row (`tr`) from a given `section`.
  external void deleteRow(int index);

  /// The **`rows`** read-only property of the [HTMLTableSectionElement]
  /// interface returns a live [HTMLCollection] containing the rows in the
  /// section. The `HTMLCollection` is live and is automatically updated when
  /// rows are added or removed.
  external HTMLCollection get rows;
  external String get align;
  external set align(String value);

  /// The **`ch`** property of the [HTMLTableSectionElement] interface does
  /// nothing. It reflects the `char` attribute of the section element.
  ///
  /// > **Note:** This property was designed to participate to the ability to
  /// > align table cell content on a specific character (typically the decimal
  /// > point), but was never implemented by browsers.
  /// >
  /// > To achieve such alignment, watch for the support of a string value with
  /// > the  CSS property.
  external String get ch;
  external set ch(String value);

  /// The **`chOff`** property of the [HTMLTableSectionElement] interface does
  /// nothing. It reflects the `charoff` attribute of the section element.
  ///
  /// > **Note:** This property was designed to participate in an ability to
  /// > align table cell content on a specific character (typically the decimal
  /// > point), but was never implemented by browsers.
  /// >
  /// > To achieve such alignment, watch for the support of a string value with
  /// > the  CSS property.
  external String get chOff;
  external set chOff(String value);
  external String get vAlign;
  external set vAlign(String value);
}

/// The **`HTMLTableRowElement`** interface provides special properties and
/// methods (beyond the [HTMLElement] interface it also has available to it by
/// inheritance) for manipulating the layout and presentation of rows in an HTML
/// table.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLTableRowElement).
extension type HTMLTableRowElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLTableRowElement] using the tag 'tr'.
  HTMLTableRowElement() : _ = document.createElement('tr');

  /// The **`insertCell()`** method of the [HTMLTableRowElement] interface
  /// inserts a new
  /// cell (`td`) into a table row (`tr`) and returns a
  /// reference to the cell.
  ///
  /// > **Note:** `insertCell()` inserts the cell directly into the
  /// > row. The cell does not need to be appended separately
  /// > with [Node.appendChild] as would be the case if
  /// > [Document.createElement] had been used to create the new
  /// > `<td>` element.
  /// >
  /// > You can not use `insertCell()` to create a new `<th>`
  /// > element though.
  external HTMLTableCellElement insertCell([int index]);

  /// The **`deleteCell()`** method of the [HTMLTableRowElement] interface
  /// removes a
  /// specific row cell from a given `tr`.
  external void deleteCell(int index);

  /// The **`rowIndex`** read-only property of the [HTMLTableRowElement]
  /// interface
  /// represents the position of a row within the whole `table`.
  ///
  /// Even when the `thead`, `tbody`, and
  /// `tfoot` elements are out of order in the HTML, browsers render the
  /// table in the right order. Therefore the rows count from `<thead>` to
  /// `<tbody>`, from `<tbody>` to
  /// `<tfoot>`.
  external int get rowIndex;

  /// The **`sectionRowIndex`** read-only property of the [HTMLTableRowElement]
  /// interface
  /// represents the position of a row within the current section (`thead`,
  /// `tbody`, or `tfoot`).
  external int get sectionRowIndex;

  /// The **`cells`** read-only property of the [HTMLTableRowElement] interface
  /// returns a live [HTMLCollection] containing the cells in the row. The
  /// `HTMLCollection` is live and is automatically updated when cells are added
  /// or removed.
  external HTMLCollection get cells;
  external String get align;
  external set align(String value);

  /// The **`ch`** property of the [HTMLTableRowElement] interface does nothing.
  /// It reflects the `char` attribute of the `tr` element.
  ///
  /// > **Note:** This property was designed to participate to the ability to
  /// > align table cell content on a specific character (typically the decimal
  /// > point), but was never implemented by browsers.
  /// >
  /// > To achieve such alignment, watch for the support of a string value with
  /// > the  CSS property.
  external String get ch;
  external set ch(String value);

  /// The **`chOff`** property of the [HTMLTableRowElement] interface does
  /// nothing. It reflects the `charoff` attribute of the `tr` element.
  ///
  /// > **Note:** This property was designed to participate in an ability to
  /// > align table cell content on a specific character (typically the decimal
  /// > point), but was never implemented by browsers.
  /// >
  /// > To achieve such alignment, watch for the support of a string value with
  /// > the  CSS property.
  external String get chOff;
  external set chOff(String value);
  external String get vAlign;
  external set vAlign(String value);

  /// The **`HTMLTableRowElement.bgColor`** property is used to set the
  /// background color of a row or retrieve the value of the obsolete
  /// [`bgColor`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/tr#bgcolor)
  /// attribute, if present.
  ///
  /// **Note:** This property is deprecated and CSS should be used to set the
  /// background color. Use the  property instead.
  external String get bgColor;
  external set bgColor(String value);
}

/// The **`HTMLTableCellElement`** interface provides special properties and
/// methods (beyond the regular [HTMLElement] interface it also has available to
/// it by inheritance) for manipulating the layout and presentation of table
/// cells, either header cells (`th`) or data cells (`td`), in an HTML document.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLTableCellElement).
extension type HTMLTableCellElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLTableCellElement] using the tag 'td'.
  HTMLTableCellElement.td() : _ = document.createElement('td');

  /// Creates an [HTMLTableCellElement] using the tag 'th'.
  HTMLTableCellElement.th() : _ = document.createElement('th');

  /// The **`colSpan`** read-only property of the [HTMLTableCellElement]
  /// interface represents the number of columns this cell must span; this lets
  /// the cell occupy space across multiple columns of the table. It reflects
  /// the
  /// [`colspan`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/td#colspan)
  /// attribute.
  external int get colSpan;
  external set colSpan(int value);

  /// The **`rowSpan`** read-only property of the [HTMLTableCellElement]
  /// interface represents the number of rows this cell must span; this lets the
  /// cell occupy space across multiple rows of the table. It reflects the
  /// [`rowspan`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/td#colspan)
  /// attribute.
  external int get rowSpan;
  external set rowSpan(int value);

  /// The **`headers`** property of the [HTMLTableCellElement] interface
  /// contains a list of IDs of `th` elements that are _headers_ for this
  /// specific cell.
  external String get headers;
  external set headers(String value);

  /// The **`cellIndex`** read-only property of the [HTMLTableCellElement]
  /// interface
  /// represents the position of a cell within its row (`tr`). The first cell
  /// has an index of `0`.
  external int get cellIndex;

  /// The **`scope`** property of the [HTMLTableCellElement] interface
  /// indicates the scope of a `th` cell.
  ///
  /// Header cells can be configured, using the `scope` attribute, to apply to a
  /// specified row or column, or to the not-yet-scoped cells within the current
  /// row group (that is, the same ancestor `thead`, `tbody`, or `tfoot`
  /// element). If no value is specified for `scope`, the header is not
  /// associated directly with cells in this way. Permitted values for `scope`
  /// are:
  ///
  /// > **Note:** this property doesn't have a visual effect in browsers. It
  /// > adds semantic information to help assistive technology like
  /// > screenreaders to present the table in a more coherent way.
  external String get scope;
  external set scope(String value);

  /// The **`abbr`** property of the [HTMLTableCellElement] interface
  /// indicates an abbreviation associated with the cell. If the cell does not
  /// represent a header cell `th`, it is ignored.
  ///
  /// It reflects the `abbr` attribute of the `th` element.
  ///
  /// > **Note:** this property doesn't have a visual effect in browsers. It
  /// > adds information to help assistive technology like screenreaders that
  /// > can use this abbreviation
  external String get abbr;
  external set abbr(String value);

  /// The **`align`** property of the [HTMLTableCellElement] interface is a
  /// string indicating how to horizontally align text in the `th` or `td` table
  /// cell.
  ///
  /// > **Note:** This property is deprecated, and CSS should be used to align
  /// > text horizontally in a cell. Use the CSS  property, which takes
  /// > precedence, to horizontally align text in a cell instead.
  external String get align;
  external set align(String value);
  external String get axis;
  external set axis(String value);
  external String get height;
  external set height(String value);
  external String get width;
  external set width(String value);

  /// The **`ch`** property of the [HTMLTableCellElement] interface does
  /// nothing. It reflects the `char` attribute of the cell element.
  ///
  /// > **Note:** This property was designed to participate to the ability to
  /// > align table cell content on a specific character (typically the decimal
  /// > point), but was never implemented by browsers.
  /// >
  /// > To achieve such alignment, watch for the support of a string value with
  /// > the  CSS property.
  external String get ch;
  external set ch(String value);

  /// The **`chOff`** property of the [HTMLTableCellElement] interface does
  /// nothing. It reflects the `charoff` attribute of the cell element.
  ///
  /// > **Note:** This property was designed to participate in an ability to
  /// > align table cell content on a specific character (typically the decimal
  /// > point), but was never implemented by browsers.
  /// >
  /// > To achieve such alignment, watch for the support of a string value with
  /// > the  CSS property.
  external String get chOff;
  external set chOff(String value);

  /// The **`noWrap`** property of the [HTMLTableCellElement] interface returns
  /// a Boolean value indicating if the text of the cell may be wrapped on
  /// several lines or not.
  ///
  /// > **Note:** This property is deprecated and you should use the CSS
  /// > property with the value `nowrap` instead.
  external bool get noWrap;
  external set noWrap(bool value);

  /// The **`vAlign`** property of the [HTMLTableCellElement] interface is a
  /// string indicating how to vertically align text in a `th` or `td` table
  /// cell.
  ///
  /// > **Note:** This property is deprecated. Use the CSS  property to
  /// > horizontally align text in a cell instead.
  external String get vAlign;
  external set vAlign(String value);

  /// The **`HTMLTableCellElement.bgColor`** property is used to set the
  /// background color of a cell or get the value of the obsolete
  /// [`bgColor`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/td#bgcolor)
  /// attribute, if present.
  ///
  /// **Note:** This property is deprecated and CSS should be used to set the
  /// background color. Use the  property instead.
  external String get bgColor;
  external set bgColor(String value);
}

/// The **`HTMLFormElement`** interface represents a `form` element in the DOM.
/// It allows access to—and, in some cases, modification of—aspects of the form,
/// as well as access to its component elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement).
extension type HTMLFormElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLFormElement] using the tag 'form'.
  HTMLFormElement() : _ = document.createElement('form');

  external JSObject operator [](JSAny indexOrName);

  /// The **`HTMLFormElement.submit()`** method submits a given
  /// `form`.
  ///
  /// This method is similar, but not identical to, activating a form's submit
  /// `button`. When invoking this method directly, however:
  ///
  /// - No [HTMLFormElement.submit_event] event is raised. In particular, the
  ///   form's `onsubmit` event handler is not run.
  /// - [Constraint validation](https://developer.mozilla.org/en-US/docs/Web/HTML/Constraint_validation)
  ///   is not triggered.
  ///
  /// The [HTMLFormElement.requestSubmit] method is identical to activating a
  /// form's submit `button` and does not have these differences.
  ///
  /// A form control (such as a submit button) with a `name` or `id` of `submit`
  /// will mask the form's `submit` method. Trying to call `myForm.submit();`
  /// throws an error "submit is not a function" because in this case `submit`
  /// refers to the form control which has a `name` or `id` of `submit`.
  ///
  /// `input` with attribute type="submit" will not be submitted with the
  /// form when using **`HTMLFormElement.submit()`**, but it would be
  /// submitted when you do it with original HTML form submit.
  external void submit();

  /// The [HTMLFormElement] method **`requestSubmit()`** requests
  /// that the form be submitted using a specific submit button.
  external void requestSubmit([HTMLElement? submitter]);

  /// The **`HTMLFormElement.reset()`** method restores a form
  /// element's default values. This method does the same thing as clicking the
  /// form's
  /// [`<input
  /// type="reset">`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/reset)
  /// control.
  ///
  /// If a form control (such as a reset button) has a name or id of _reset_ it
  /// will
  /// mask the form's reset method. It does not reset other attributes in the
  /// input, such as
  /// `disabled`.
  ///
  /// Note that if [Element.setAttribute] is called to set
  /// the value of a particular attribute, a subsequent call to `reset()` won't
  /// reset the attribute to its default value, but instead will keep the
  /// attribute at
  /// whatever value the [Element.setAttribute] call set it to.
  external void reset();
  external bool checkValidity();

  /// The **`HTMLFormElement.reportValidity()`** method returns
  /// `true` if the element's child controls satisfy their validation
  /// constraints.
  /// When `false` is returned, cancelable
  /// [`invalid`](https://developer.mozilla.org/en-US/docs/Web/API/HTMLInputElement/invalid_event)
  /// events are fired for
  /// each invalid child and validation problems are reported to the user.
  external bool reportValidity();

  /// The **`HTMLFormElement.acceptCharset`** property represents a
  /// list of the supported
  /// [character encodings](https://developer.mozilla.org/en-US/docs/Glossary/Character_encoding)
  /// for the given `form` element. This list can be
  /// comma-separated or space-separated.
  external String get acceptCharset;
  external set acceptCharset(String value);

  /// The **`HTMLFormElement.action`** property represents the action
  /// of the `form` element.
  ///
  /// The action of a form is the program that is executed on the server when
  /// the form is
  /// submitted. This property can be retrieved or set.
  external String get action;
  external set action(String value);
  external String get autocomplete;
  external set autocomplete(String value);

  /// The **`HTMLFormElement.enctype`** property is the  of content that is used
  /// to submit the form to the server. Possible values are:
  ///
  /// - `application/x-www-form-urlencoded`: The initial default type.
  /// - `multipart/form-data`: The type that allows file `input`
  /// element(s) to upload file data.
  /// - `text/plain`: Ambiguous format, human-readable content not reliably
  ///   interpretable by computer.
  ///
  /// This value can be overridden by a
  /// [`formenctype`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/button#formenctype)
  /// attribute
  /// on a `button` or `input` element.
  external String get enctype;
  external set enctype(String value);

  /// The **`HTMLFormElement.encoding`** property is an alternative name for the
  /// [HTMLFormElement.enctype] element on the DOM [HTMLFormElement] object.
  external String get encoding;
  external set encoding(String value);

  /// The **`HTMLFormElement.method`** property represents the
  /// method used to submit the `form`.
  ///
  /// Unless explicitly specified, the default method is 'get'.
  external String get method;
  external set method(String value);

  /// The **`HTMLFormElement.name`** property represents the name of
  /// the current `form` element as a string.
  ///
  /// If your `Form` element contains an element named _name_ then
  /// that element overrides the `form.name` property, so that you can't access
  /// it.
  external String get name;
  external set name(String value);
  external bool get noValidate;
  external set noValidate(bool value);

  /// The **`target`** property of the [HTMLFormElement]
  /// interface represents the target of the form's action (i.e., the frame in
  /// which to render
  /// its output).
  external String get target;
  external set target(String value);
  external String get rel;
  external set rel(String value);
  external DOMTokenList get relList;

  /// The [HTMLFormElement] property
  /// **`elements`** returns an
  /// [HTMLFormControlsCollection] listing all the form controls contained in
  /// the `form` element.
  ///
  /// Independently, you can obtain just the
  /// number of form controls using the [HTMLFormElement.length]
  /// property.
  ///
  /// You can access a particular form control in the returned collection by
  /// using either an
  /// index or the element's `name` or `id` attributes.
  ///
  /// Prior to HTML 5, the returned object was an [HTMLCollection], on which
  /// `HTMLFormControlsCollection` is based.
  ///
  /// > **Note:** Similarly, you can get a list of all of the forms contained
  /// > within a given document using the document's [Document.forms] property.
  external HTMLFormControlsCollection get elements;

  /// The **`HTMLFormElement.length`**
  /// read-only property returns the number of controls in the `form`
  /// element.
  ///
  /// You can access the list of the form's controls using the
  /// [HTMLFormElement.elements] property.
  ///
  /// This includes both elements that are descendants of the `<form>`
  /// element as well as elements that are made members of the form using their
  /// `form` property.
  ///
  /// Elements that are considered for this property are: `button`,
  /// `fieldset`, `input` (with the exception
  /// that any whose type is "image" are omitted for historical reasons),
  /// `object`, `output`, `select`,
  /// and `textarea`.
  external int get length;
}

/// The **`HTMLLabelElement`** interface gives access to properties specific to
/// `label` elements. It inherits methods and properties from the base
/// [HTMLElement] interface.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLLabelElement).
extension type HTMLLabelElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLLabelElement] using the tag 'label'.
  HTMLLabelElement() : _ = document.createElement('label');

  /// The read-only **`HTMLLabelElement.form`** property returns an
  /// [HTMLFormElement] object which represents the form of which the label's
  /// associated control is a part, or null if there is either no associated
  /// control, or if
  /// that control isn't in a form.
  ///
  /// This property is just a shortcut for `HTMLLabelElement.control.form`.
  external HTMLFormElement? get form;

  /// The **`HTMLLabelElement.htmlFor`** property reflects the value
  /// of the
  /// [`for`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/label#for)
  /// content property. That means that this
  /// script-accessible property is used to set and read the value of the
  /// content property
  /// `for`, which is the ID of the label's associated control element.
  external String get htmlFor;
  external set htmlFor(String value);

  /// The read-only **`HTMLLabelElement.control`** property returns a
  /// reference to the control (in the form of an object of type [HTMLElement]
  /// or
  /// one of its derivatives) with which the `label` element is associated,
  /// or `null` if the label isn't associated with a control.
  external HTMLElement? get control;
}

/// The **`HTMLInputElement`** interface provides special properties and methods
/// for manipulating the options, layout, and presentation of `input` elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLInputElement).
extension type HTMLInputElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLInputElement] using the tag 'input'.
  HTMLInputElement() : _ = document.createElement('input');

  /// The **`HTMLInputElement.stepUp()`** method increments the value
  /// of a numeric type of `input` element by the value of the
  /// [`step`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/step)
  /// attribute, or the
  /// default `step` value if the step attribute is not explicitly set. The
  /// method,
  /// when invoked, increments the
  /// [`value`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#value)
  /// by
  /// ([`step`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#step)
  /// \* n), where `n` defaults to
  /// `1` if not specified, and
  /// [`step`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/step)
  /// defaults to the
  /// default value for `step` if not specified.
  ///
  /// <table class="no-markdown">
  ///   <thead>
  ///     <tr>
  ///       <th>Input type</th>
  ///       <th>Default step value</th>
  ///       <th>Example step declaration</th>
  ///     </tr>
  ///     <tr>
  ///       <td>`date`</td>
  ///       <td><code>1</code> (day)</td>
  ///       <td>
  /// 7 day (one week) increments:<br />
  ///         <code>&#x3C;input type="date" min="2019-12-25" step="7"></code>
  ///       </td>
  ///     </tr>
  ///     <tr>
  ///       <td>`month`</td>
  ///       <td><code>1</code> (month)</td>
  ///       <td>
  /// 12 month (one year) increments:<br />
  ///         <code>&#x3C;input type="month" min="2019-12" step="12"></code>
  ///       </td>
  ///     </tr>
  ///     <tr>
  ///       <td>`week`</td>
  ///       <td><code>1</code> (week)</td>
  ///       <td>
  /// Two week increments:<br />
  ///         <code>&#x3C;input type="week" min="2019-W23" step="2"></code>
  ///       </td>
  ///     </tr>
  ///     <tr>
  ///       <td>`time`</td>
  ///       <td><code>60</code> (seconds)</td>
  ///       <td>
  /// 900 second (15 minute) increments:<br />
  ///         <code>&#x3C;input type="time" min="09:00" step="900"></code>
  ///       </td>
  ///     </tr>
  ///     <tr>
  ///       <td>
  ///       </td>
  ///       <td><code>1</code> (day)</td>
  ///       <td>
  /// Same day of the week:<br />
  ///         <code>&#x3C;input type="datetime-local" min="019-12-25T19:30"
  /// step="7"></code>
  ///       </td>
  ///     </tr>
  ///     <tr>
  ///       <td>`number`</td>
  ///       <td><code>1</code></td>
  ///       <td>
  /// 0.1 increments<br />
  ///         <code>&#x3C;input type="number" min="0" step="0.1" max="10"></code>
  ///       </td>
  ///     </tr>
  ///     <tr>
  ///       <td>`range`</td>
  ///       <td><code>1</code></td>
  ///       <td>
  /// Increments by 2:<br />
  ///         <code>&#x3C;input type="range" min="0" step="2" max="10"></code>
  ///       </td>
  ///     </tr>
  ///   </thead>
  /// </table>
  ///
  /// The method, when invoked, changes the form control's value by the value
  /// given in the
  /// `step` attribute, multiplied by the parameter, within the constraints set
  /// on
  /// the form control. The default value for the parameter, if no value is
  /// passed, is
  /// `1`. The method will not cause the value to exceed the
  /// set
  /// [`max`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/max)
  /// value, or defy
  /// the constraints set by the
  /// [`step`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/step)
  /// attribute.
  ///
  /// If the value before invoking the `stepUp()` method is invalid—for example,
  /// if it doesn't match the constraints set by the step attribute—invoking the
  /// `stepUp()` method will return a value that does match the form controls
  /// constraints.
  ///
  /// If the form control is non time, date, or numeric in nature, and therefore
  /// does not
  /// support the `step` attribute (see the list of supported input types in the
  /// table above), or if the step value is set to `any`, an
  /// `InvalidStateError` exception is thrown.
  external void stepUp([int n]);

  /// The
  /// **`HTMLInputElement.stepDown([n])`** method decrements the
  /// value of a numeric type of `input` element by the value of the
  /// [`step`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/step)
  /// attribute or up
  /// to `n` multiples of the step attribute if a number is passed as the
  /// parameter.
  ///
  /// The method, when invoked, decrements the
  /// [`value`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#value)
  /// by
  /// ([`step`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#step)
  /// \* n), where n
  /// defaults to 1 if not specified, and
  /// [`step`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/step)
  /// defaults to the
  /// default value for `step` if not specified.
  ///
  /// Valid on all numeric, date, and time input types that support the step
  /// attribute,
  /// including `date`, `month`,
  /// `week`, `time`,
  /// ,
  /// `number`, and `range`.
  ///
  /// Given `<input id="myTime" type="time" max="17:00" step="900"
  /// value="17:00">`,
  /// invoking `myTime.stepDown(3)` will change the value to 16:15, decrementing
  /// the
  /// time by `3 * 900`, or 45 minutes. `myTime.stepDown()`, with no
  /// parameter, would have resulted in `16:45`, as `n` defaults to
  /// `1`.
  ///
  /// ```html
  /// <!-- decrements by intervals of 900 seconds (15 minute) -->
  /// <input type="time" max="17:00" step="900" />
  ///
  /// <!-- decrements by intervals of 7 days (one week) -->
  /// <input type="date" max="2019-12-25" step="7" />
  ///
  /// <!-- decrements by intervals of 12 months (one year) -->
  /// <input type="month" max="2019-12" step="12" />
  /// ```
  ///
  /// However, calling `stepDown` on `<input type="time" max="17:00"
  /// step="900">` would not set the value to `17:00`, as one would expect — and
  /// as it does for `stepUp` when the input is `<input type="time" min="17:00"
  /// step="900">`. Instead, the first call to `stepDown` will set the initial
  /// value to `23:45` even though the `max` attribute is set. The second call
  /// will set the value to `17:00`. And the third call to will set the value to
  /// `16:45`.
  ///
  /// ```js
  /// let input1 = document.createElement("input");
  /// input1.setAttribute("type", "time");
  /// input1.setAttribute("min", "17:00");
  /// input1.setAttribute("step", 900);
  /// console.log(input1.value); // ""
  /// input1.stepUp();
  /// console.log(input1.value); // "17:00"
  /// // However
  /// let input2 = document.createElement("input");
  /// input2.setAttribute("type", "time");
  /// input2.setAttribute("max", "17:00");
  /// input2.setAttribute("step", 900);
  /// console.log(input2.value); // ""
  /// input2.stepDown();
  /// console.log(input2.value); // "23:45"
  /// input2.stepDown();
  /// console.log(input2.value); // "17:00"
  /// input2.stepDown();
  /// console.log(input2.value); // "16:45"
  /// ```
  ///
  /// The method, when invoked, changes the form control's value by the value
  /// given in the
  /// `step` attribute, multiplied by the parameter, within the constraints set
  /// within the form control. The default value for the parameter, if not is
  /// passed, is 1.
  /// The method will not cause the value to go below the
  /// [`min`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/min)
  /// value set or defy the
  /// constraints set by the
  /// [`step`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/step)
  /// attribute. A
  /// negative value for `n` will increment the value, but will not increment
  /// beyond the
  /// [`max`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/max)
  /// value.
  ///
  /// If the value before invoking the `stepDown()` method is invalid, for
  /// example, if it doesn't match the constraints set by the `step` attribute,
  /// invoking the `stepDown()` method will return a value that does match the
  /// form
  /// controls constraints.
  ///
  /// If the form control is non time, date, or numeric in nature, and therefore
  /// does not
  /// support the `step` attribute (see the list of supported input types
  /// above), or if the `step` value is set to `any`, an
  /// `InvalidStateError` exception is thrown.
  ///
  /// - [HTMLInputElement.stepDown]
  ///
  ///   - : Decrements the [`value`](/en-US/docs/Web/HTML/Element/input#value) by
  /// ([`step`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#step)
  /// \* n), where n defaults to 1 if not specified. Throws
  /// an `InvalidStateError` exception:
  ///
  ///     - if the method is not applicable to for the current
  /// [`type`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#type)
  /// value,
  ///     - if the element has no [`step`](/en-US/docs/Web/HTML/Element/input#step) value,
  ///     - if the [`value`](/en-US/docs/Web/HTML/Element/input#value) cannot be converted to a number,
  ///     - if the resulting value is above the [`max`](/en-US/docs/Web/HTML/Element/input#max) or below the
  /// [`min`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#min).
  external void stepDown([int n]);

  /// The **`HTMLInputElement.checkValidity()`** method returns a boolean value
  /// which indicates validity of the value of the element. If the value is
  /// invalid, this method also fires the [HTMLInputElement.invalid_event] event
  /// on the element.
  external bool checkValidity();

  /// The **`reportValidity()`** method of the [HTMLInputElement] interface
  /// performs the same validity checking steps as the
  /// [HTMLInputElement.checkValidity] method. If the value is invalid, this
  /// method also fires the [HTMLInputElement.invalid_event] event on the
  /// element, and (if the event isn't canceled) reports the problem to the
  /// user.
  external bool reportValidity();

  /// The **`HTMLInputElement.setCustomValidity()`** method sets a custom
  /// validity message for the element.
  external void setCustomValidity(String error);

  /// The **`HTMLInputElement.select()`** method selects all the text
  /// in a `textarea` element or in an `input` element
  /// that includes a text field.
  external void select();

  /// The **`HTMLInputElement.setRangeText()`** method replaces a
  /// range of text in an `input` or `textarea` element with
  /// a new string.
  external void setRangeText(
    String replacement, [
    int start,
    int end,
    SelectionMode selectionMode,
  ]);

  /// The **`HTMLInputElement.setSelectionRange()`** method sets the start and
  /// end positions of the current text selection in an `input` or `textarea`
  /// element.
  ///
  /// The element must be focused for the call to have any effect.
  ///
  /// Optionally, you can specify the direction in which selection should be
  /// considered to have occurred. This lets you indicate, for example, that the
  /// selection was set by the user clicking and dragging from the end of the
  /// selected text toward the beginning.
  ///
  /// This method updates the [HTMLInputElement.selectionStart],
  /// [HTMLInputElement.selectionEnd], and [HTMLInputElement.selectionDirection]
  /// properties in one call.
  ///
  /// The element must be of one of the following input types:
  /// [`password`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/password),
  /// [`search`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/search),
  /// [`tel`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/tel),
  /// [`text`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/text),
  /// or
  /// [`url`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/url).
  /// Otherwise the browser throws an `InvalidStateError` exception.
  ///
  /// If you wish to select **all** text of an input element, you can use the
  /// [HTMLInputElement.select()](https://developer.mozilla.org/en-US/docs/Web/API/HTMLInputElement/select)
  /// method instead.
  external void setSelectionRange(
    int start,
    int end, [
    String direction,
  ]);

  /// The **`HTMLInputElement.showPicker()`** method displays the browser picker
  /// for an `input` element.
  ///
  /// This is the same picker that would normally be displayed when the element
  /// is selected, but can be triggered from a button press or other user
  /// interaction.
  ///
  /// Commonly browsers implement it for inputs of these types: `"date"`,
  /// `"month"`, `"week"`, `"time"`, `"datetime-local"`, `"color"`, or `"file"`.
  /// It can also be prepopulated with items from a `datalist` element or
  /// [`autocomplete`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/autocomplete)
  /// attribute.
  ///
  /// More generally, this method should ideally display the picker for any
  /// input element on the platform that has a picker.
  external void showPicker();
  external String get accept;
  external set accept(String value);
  external String get alt;
  external set alt(String value);
  external String get autocomplete;
  external set autocomplete(String value);
  external bool get defaultChecked;
  external set defaultChecked(bool value);
  external bool get checked;
  external set checked(bool value);
  external String get dirName;
  external set dirName(String value);

  /// The **`HTMLInputElement.disabled`** property is a boolean value that
  /// reflects the
  /// [`disabled`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#disabled)
  /// HTML attribute, which indicates whether the control is disabled. If it is
  /// disabled, it does not accept clicks. A disabled element is unusable and
  /// un-clickable.
  external bool get disabled;
  external set disabled(bool value);
  external HTMLFormElement? get form;

  /// The **`HTMLInputElement.files`** property allows you to access the
  /// [FileList] selected with the [`<input
  /// type="file">`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/file)
  /// element.
  external FileList? get files;
  external set files(FileList? value);
  external String get formAction;
  external set formAction(String value);
  external String get formEnctype;
  external set formEnctype(String value);
  external String get formMethod;
  external set formMethod(String value);
  external bool get formNoValidate;
  external set formNoValidate(bool value);
  external String get formTarget;
  external set formTarget(String value);
  external int get height;
  external set height(int value);
  external bool get indeterminate;
  external set indeterminate(bool value);
  external HTMLDataListElement? get list;
  external String get max;
  external set max(String value);
  external int get maxLength;
  external set maxLength(int value);
  external String get min;
  external set min(String value);
  external int get minLength;
  external set minLength(int value);

  /// The **`HTMLInputElement.multiple`** property indicates if an input can
  /// have more than one value. Firefox currently only supports `multiple` for
  /// `<input type="file">`.
  external bool get multiple;
  external set multiple(bool value);
  external String get name;
  external set name(String value);
  external String get pattern;
  external set pattern(String value);
  external String get placeholder;
  external set placeholder(String value);
  external bool get readOnly;
  external set readOnly(bool value);
  external bool get required;
  external set required(bool value);
  external int get size;
  external set size(int value);
  external String get src;
  external set src(String value);
  external String get step;
  external set step(String value);

  /// The **`type`** property of the [HTMLInputElement] interface indicates the
  /// kind of data allowed in the `input` element, for example a number, a date,
  /// or an email. Browsers will select the appropriate widget and behavior to
  /// help users to enter a valid value.
  ///
  /// It reflects the
  /// [`type`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#type)
  /// attribute of the `input` element.
  external String get type;
  external set type(String value);
  external String get defaultValue;
  external set defaultValue(String value);
  external String get value;
  external set value(String value);
  external JSObject? get valueAsDate;
  external set valueAsDate(JSObject? value);
  external double get valueAsNumber;
  external set valueAsNumber(num value);
  external int get width;
  external set width(int value);
  external bool get willValidate;
  external ValidityState get validity;
  external String get validationMessage;

  /// The **`HTMLInputElement.labels`** read-only property returns a
  /// [NodeList] of the `label` elements associated with the
  /// `input` element, if the element is not hidden. If the element has the
  /// type `hidden`, the property returns `null`.
  external NodeList? get labels;

  /// The **`selectionStart`** property of the [HTMLInputElement] interface is a
  /// number that represents the beginning index of the selected text. When
  /// nothing is selected, then returns the position of the text input cursor
  /// (caret) inside of the `<input>` element.
  ///
  /// > **Note:** According to the
  /// > [WHATWG forms spec](https://html.spec.whatwg.org/multipage/forms.html#concept-input-apply)
  /// > `selectionStart` property applies only to inputs of types text, search,
  /// > URL, tel, and password. In modern browsers, throws an exception while
  /// > setting `selectionStart` property on the rest of input types.
  /// > Additionally, this property returns `null` while accessing
  /// > `selectionStart` property on non-text input elements.
  ///
  /// If `selectionStart` is greater than `selectionEnd`, then both are
  /// treated as the value of `selectionEnd`.
  external int? get selectionStart;
  external set selectionStart(int? value);

  /// The **`selectionEnd`** property of the [HTMLInputElement] interface is a
  /// number that represents the end index of the selected text. When there is
  /// no selection, this returns the offset of the character immediately
  /// following the current text input cursor position.
  ///
  /// > **Note:** According to the
  /// > [WHATWG forms spec](https://html.spec.whatwg.org/multipage/forms.html#concept-input-apply)
  /// > `selectionEnd` property applies only to inputs of types text, search,
  /// > URL, tel, and password. In modern browsers, throws an exception while
  /// > setting `selectionEnd` property on the rest of input types.
  /// > Additionally, this property returns `null` while accessing
  /// > `selectionEnd` property on non-text input elements.
  ///
  /// If `selectionEnd` is less than `selectionStart`, then both are
  /// treated as the value of `selectionEnd`.
  external int? get selectionEnd;
  external set selectionEnd(int? value);

  /// The **`selectionDirection`** property of the [HTMLInputElement] interface
  /// is a string that indicates the direction in which the user is selecting
  /// the text.
  external String? get selectionDirection;
  external set selectionDirection(String? value);

  /// The **`HTMLInputElement.webkitdirectory`** is a property
  /// that reflects the
  /// [`webkitdirectory`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/file#webkitdirectory)
  /// HTML attribute
  /// and indicates that the `input` element should let the user select
  /// directories instead of files.
  /// When a directory is selected, the directory and its entire hierarchy of
  /// contents are included in the set of selected items.
  /// The selected file system entries can be obtained using the
  /// [HTMLInputElement.webkitEntries] property.
  ///
  /// > **Note:** This property is called `webkitEntries` in the specification
  /// > due to its
  /// > origins as a Google Chrome-specific API. It's likely to be renamed
  /// > someday.
  external bool get webkitdirectory;
  external set webkitdirectory(bool value);

  /// The read-only **`webkitEntries`**
  /// property of the [HTMLInputElement] interface contains an array of file
  /// system entries (as objects based on [FileSystemEntry]) representing files
  /// and/or directories selected by the user using an `input` element of
  /// type `file`, but only if that selection was made using drag-and-drop:
  /// selecting a file in the dialog will leave the property empty.
  ///
  /// The array can only contain directories if the
  /// [HTMLInputElement.webkitdirectory] property is
  /// `true`. This means the `<input>` element was configured to
  /// let the user choose directories.
  ///
  /// > **Note:** This property is called `webkitEntries` in the specification
  /// > due to its
  /// > origins as a Google Chrome-specific API. It's likely to be renamed
  /// > someday.
  external JSArray<FileSystemEntry> get webkitEntries;
  external String get capture;
  external set capture(String value);
  external String get align;
  external set align(String value);
  external String get useMap;
  external set useMap(String value);

  /// The **`popoverTargetElement`** property of the [HTMLInputElement]
  /// interface gets and sets the popover element to control via an `input`
  /// element of `type="button"`.
  ///
  /// It is the JavaScript equivalent of the
  /// [`popovertarget`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/button#popovertarget)
  /// HTML attribute.
  external Element? get popoverTargetElement;
  external set popoverTargetElement(Element? value);

  /// The **`popoverTargetAction`** property of the [HTMLInputElement] interface
  /// gets and sets the action to be performed (`"hide"`, `"show"`, or
  /// `"toggle"`) on a popover element being controlled by an `input` element of
  /// `type="button"`.
  ///
  /// It reflects the value of the
  /// [`popovertargetaction`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/button#popovertargetaction)
  /// HTML attribute.
  external String get popoverTargetAction;
  external set popoverTargetAction(String value);
}

/// The **`HTMLButtonElement`** interface provides properties and methods
/// (beyond the regular [HTMLElement] interface it also has available to it by
/// inheritance) for manipulating `button` elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLButtonElement).
extension type HTMLButtonElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLButtonElement] using the tag 'button'.
  HTMLButtonElement() : _ = document.createElement('button');

  external bool checkValidity();
  external bool reportValidity();
  external void setCustomValidity(String error);

  /// The **`HTMLButtonElement.disabled`** property indicates whether the
  /// control is disabled, meaning that it does not accept any clicks.
  external bool get disabled;
  external set disabled(bool value);
  external HTMLFormElement? get form;
  external String get formAction;
  external set formAction(String value);
  external String get formEnctype;
  external set formEnctype(String value);
  external String get formMethod;
  external set formMethod(String value);
  external bool get formNoValidate;
  external set formNoValidate(bool value);
  external String get formTarget;
  external set formTarget(String value);
  external String get name;
  external set name(String value);

  /// The **`type`** property of the [HTMLButtonElement] interface is a string
  /// that indicates the behavior type of the `button` element.
  ///
  /// It reflects the
  /// [`type`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/button#type)
  /// attribute of the `button` element.
  external String get type;
  external set type(String value);
  external String get value;
  external set value(String value);
  external bool get willValidate;
  external ValidityState get validity;
  external String get validationMessage;

  /// The **`HTMLButtonElement.labels`** read-only property returns a
  /// [NodeList] of the `label` elements associated with the
  /// `button` element.
  external NodeList get labels;

  /// The **`popoverTargetElement`** property of the [HTMLButtonElement]
  /// interface gets and sets the popover element to control via a button.
  ///
  /// It is the JavaScript equivalent of the
  /// [`popovertarget`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/button#popovertarget)
  /// HTML attribute.
  external Element? get popoverTargetElement;
  external set popoverTargetElement(Element? value);

  /// The **`popoverTargetAction`** property of the [HTMLButtonElement]
  /// interface gets and sets the action to be performed (`"hide"`, `"show"`, or
  /// `"toggle"`) on a popover element being controlled by a button.
  ///
  /// It reflects the value of the
  /// [`popovertargetaction`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/button#popovertargetaction)
  /// HTML attribute.
  external String get popoverTargetAction;
  external set popoverTargetAction(String value);
}

/// The **`HTMLSelectElement`** interface represents a `select` HTML Element.
/// These elements also share all of the properties and methods of other HTML
/// elements via the [HTMLElement] interface.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLSelectElement).
extension type HTMLSelectElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLSelectElement] using the tag 'select'.
  HTMLSelectElement() : _ = document.createElement('select');

  /// The **`HTMLSelectElement.item()`** method returns the
  /// [Element] corresponding to the [HTMLOptionElement] whose
  /// position in the options list corresponds to the index given in the
  /// parameter, or
  /// `null` if there are none.
  ///
  /// In JavaScript, using the array bracket syntax with an `unsigned long`,
  /// like
  /// `selectElt[index]` is equivalent to
  /// `selectElt.namedItem(index)`.
  external HTMLOptionElement? item(int index);

  /// The **`HTMLSelectElement.namedItem()`** method returns the
  /// [HTMLOptionElement] corresponding to the [HTMLOptionElement]
  /// whose `name` or `id` match the specified name, or
  /// `null` if no option matches.
  ///
  /// In JavaScript, using `selectElt.namedItem('value')` is equivalent to
  /// `selectElt.options.namedItem('value')`.
  external HTMLOptionElement? namedItem(String name);

  /// The **`HTMLSelectElement.add()`** method adds an element to the
  /// collection of `option` elements for this `select` element.
  external void add(
    JSObject element, [
    JSAny? before,
  ]);

  /// The **`HTMLSelectElement.remove()`** method removes the element
  /// at the specified index from the options collection for this select
  /// element.
  external void remove([int index]);
  external void operator []=(
    int index,
    HTMLOptionElement? option,
  );

  /// The **`HTMLSelectElement.checkValidity()`** method checks
  /// whether the element has any constraints and whether it satisfies them. If
  /// the element
  /// fails its constraints, the browser fires a cancelable
  /// [HTMLSelectElement.invalid_event] event at the
  /// element, and then returns `false`.
  external bool checkValidity();
  external bool reportValidity();

  /// The **`HTMLSelectElement.setCustomValidity()`** method sets the
  /// custom validity message for the selection element to the specified
  /// message. Use the
  /// empty string to indicate that the element does _not_ have a custom
  /// validity
  /// error.
  external void setCustomValidity(String error);

  /// The **`HTMLSelectElement.showPicker()`** method displays the browser
  /// picker for a `select` element.
  ///
  /// This is the same picker that would normally be displayed when the element
  /// is selected, but can be triggered from a button press or other user
  /// interaction.
  external void showPicker();
  external String get autocomplete;
  external set autocomplete(String value);

  /// The **`HTMLSelectElement.disabled`** property is a boolean value that
  /// reflects the
  /// [`disabled`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/select#disabled)
  /// HTML attribute, which indicates whether the control is disabled. If it is
  /// disabled, it
  /// does not accept clicks. A disabled element is unusable and un-clickable.
  external bool get disabled;
  external set disabled(bool value);

  /// The **`HTMLSelectElement.form`** read-only property returns a
  /// [HTMLFormElement] representing the form that this element is associated
  /// with. If the element is not associated with a `form` element, then
  /// it returns `null`.
  external HTMLFormElement? get form;
  external bool get multiple;
  external set multiple(bool value);
  external String get name;
  external set name(String value);
  external bool get required;
  external set required(bool value);
  external int get size;
  external set size(int value);

  /// The **`HTMLSelectElement.type`**
  /// read-only property returns the form control's `type`.
  external String get type;

  /// The **`HTMLSelectElement.options`** read-only property returns
  /// a [HTMLOptionsCollection] of the `option` elements
  /// contained by the `select` element.
  external HTMLOptionsCollection get options;
  external int get length;
  external set length(int value);

  /// The **read-only** [HTMLSelectElement] property
  /// **`selectedOptions`** contains a list of the
  /// `option` elements contained within the `select`
  /// element that are currently selected. The list of selected options is an
  /// [HTMLCollection] object with one entry per currently selected option.
  ///
  /// An option is considered selected if it has an [HTMLOptionElement.selected]
  /// attribute.
  external HTMLCollection get selectedOptions;

  /// The **`HTMLSelectElement.selectedIndex`** property is a
  /// `long` that reflects the index of the first or last selected
  /// `option` element, depending on the value of `multiple`. The
  /// value `-1` indicates that no element is selected.
  external int get selectedIndex;
  external set selectedIndex(int value);

  /// The **`HTMLSelectElement.value`** property contains the value of the first
  /// selected `option` element associated with this `select` element.
  ///
  /// This property can also be set directly, for example to set a default value
  /// based on some condition.
  external String get value;
  external set value(String value);
  external bool get willValidate;
  external ValidityState get validity;
  external String get validationMessage;

  /// The **`HTMLSelectElement.labels`** read-only property returns a
  /// [NodeList] of the `label` elements associated with the
  /// `select` element.
  external NodeList get labels;
}

/// The **`HTMLDataListElement`** interface provides special properties (beyond
/// the [HTMLElement] object interface it also has available to it by
/// inheritance) to manipulate `datalist` elements and their content.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLDataListElement).
extension type HTMLDataListElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLDataListElement] using the tag 'datalist'.
  HTMLDataListElement() : _ = document.createElement('datalist');

  external HTMLCollection get options;
}

/// The **`HTMLOptGroupElement`** interface provides special properties and
/// methods (beyond the regular [HTMLElement] object interface they also have
/// available to them by inheritance) for manipulating the layout and
/// presentation of `optgroup` elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLOptGroupElement).
extension type HTMLOptGroupElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLOptGroupElement] using the tag 'optgroup'.
  HTMLOptGroupElement() : _ = document.createElement('optgroup');

  external bool get disabled;
  external set disabled(bool value);
  external String get label;
  external set label(String value);
}

/// The **`HTMLOptionElement`** interface represents `option` elements and
/// inherits all properties and methods of the [HTMLElement] interface.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLOptionElement).
extension type HTMLOptionElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLOptionElement] using the tag 'option'.
  HTMLOptionElement() : _ = document.createElement('option');

  external bool get disabled;
  external set disabled(bool value);
  external HTMLFormElement? get form;
  external String get label;
  external set label(String value);
  external bool get defaultSelected;
  external set defaultSelected(bool value);
  external bool get selected;
  external set selected(bool value);
  external String get value;
  external set value(String value);
  external String get text;
  external set text(String value);
  external int get index;
}

/// The **`HTMLTextAreaElement`** interface provides special properties and
/// methods for manipulating the layout and presentation of `textarea` elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLTextAreaElement).
extension type HTMLTextAreaElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLTextAreaElement] using the tag 'textarea'.
  HTMLTextAreaElement() : _ = document.createElement('textarea');

  external bool checkValidity();
  external bool reportValidity();
  external void setCustomValidity(String error);
  external void select();
  external void setRangeText(
    String replacement, [
    int start,
    int end,
    SelectionMode selectionMode,
  ]);
  external void setSelectionRange(
    int start,
    int end, [
    String direction,
  ]);
  external String get autocomplete;
  external set autocomplete(String value);
  external int get cols;
  external set cols(int value);
  external String get dirName;
  external set dirName(String value);
  external bool get disabled;
  external set disabled(bool value);
  external HTMLFormElement? get form;
  external int get maxLength;
  external set maxLength(int value);
  external int get minLength;
  external set minLength(int value);
  external String get name;
  external set name(String value);
  external String get placeholder;
  external set placeholder(String value);
  external bool get readOnly;
  external set readOnly(bool value);
  external bool get required;
  external set required(bool value);
  external int get rows;
  external set rows(int value);
  external String get wrap;
  external set wrap(String value);

  /// The read-only **`type`** property of the [HTMLTextAreaElement] always
  /// returns `textarea`.
  external String get type;
  external String get defaultValue;
  external set defaultValue(String value);
  external String get value;
  external set value(String value);
  external int get textLength;
  external bool get willValidate;
  external ValidityState get validity;
  external String get validationMessage;

  /// The **`HTMLTextAreaElement.labels`** read-only property returns
  /// a [NodeList] of the `label` elements associated with the
  /// `textArea` element.
  external NodeList get labels;
  external int get selectionStart;
  external set selectionStart(int value);
  external int get selectionEnd;
  external set selectionEnd(int value);
  external String get selectionDirection;
  external set selectionDirection(String value);
}

/// The **`HTMLOutputElement`** interface provides properties and methods
/// (beyond those inherited from [HTMLElement]) for manipulating the layout and
/// presentation of `output` elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLOutputElement).
extension type HTMLOutputElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLOutputElement] using the tag 'output'.
  HTMLOutputElement() : _ = document.createElement('output');

  external bool checkValidity();
  external bool reportValidity();
  external void setCustomValidity(String error);
  external DOMTokenList get htmlFor;
  external HTMLFormElement? get form;
  external String get name;
  external set name(String value);
  external String get type;
  external String get defaultValue;
  external set defaultValue(String value);
  external String get value;
  external set value(String value);
  external bool get willValidate;
  external ValidityState get validity;
  external String get validationMessage;

  /// The **`HTMLOutputElement.labels`** read-only property returns a
  /// [NodeList] of the `label` elements associated with the
  /// `output` element.
  external NodeList get labels;
}

/// The **`HTMLProgressElement`** interface provides special properties and
/// methods (beyond the regular [HTMLElement] interface it also has available to
/// it by inheritance) for manipulating the layout and presentation of
/// `progress` elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLProgressElement).
extension type HTMLProgressElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLProgressElement] using the tag 'progress'.
  HTMLProgressElement() : _ = document.createElement('progress');

  /// The **`value`** property of the [HTMLProgressElement] interface represents
  /// the current progress of the `progress` element.
  external double get value;
  external set value(num value);

  /// The **`max`** property of the [HTMLProgressElement] interface represents
  /// the upper bound of the `progress` element's range.
  external double get max;
  external set max(num value);

  /// The **`position`** read-only property of the [HTMLProgressElement]
  /// interface returns current progress of the `progress` element.
  external double get position;

  /// The **`HTMLProgressElement.labels`** read-only property returns
  /// a [NodeList] of the `label` elements associated with the
  /// `progress` element.
  external NodeList get labels;
}

/// The HTML `meter` elements expose the **`HTMLMeterElement`** interface, which
/// provides special properties and methods (beyond the [HTMLElement] object
/// interface they also have available to them by inheritance) for manipulating
/// the layout and presentation of `meter` elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLMeterElement).
extension type HTMLMeterElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLMeterElement] using the tag 'meter'.
  HTMLMeterElement() : _ = document.createElement('meter');

  external double get value;
  external set value(num value);
  external double get min;
  external set min(num value);
  external double get max;
  external set max(num value);
  external double get low;
  external set low(num value);
  external double get high;
  external set high(num value);
  external double get optimum;
  external set optimum(num value);

  /// The **`HTMLMeterElement.labels`** read-only property returns a
  /// [NodeList] of the `label` elements associated with the
  /// `meter` element.
  external NodeList get labels;
}

/// The **`HTMLFieldSetElement`** interface provides special properties and
/// methods (beyond the regular [HTMLElement] interface it also has available to
/// it by inheritance) for manipulating the layout and presentation of
/// `fieldset` elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLFieldSetElement).
extension type HTMLFieldSetElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLFieldSetElement] using the tag 'fieldset'.
  HTMLFieldSetElement() : _ = document.createElement('fieldset');

  external bool checkValidity();
  external bool reportValidity();
  external void setCustomValidity(String error);
  external bool get disabled;
  external set disabled(bool value);
  external HTMLFormElement? get form;
  external String get name;
  external set name(String value);
  external String get type;
  external HTMLCollection get elements;
  external bool get willValidate;
  external ValidityState get validity;
  external String get validationMessage;
}

/// The **`HTMLLegendElement`** is an interface allowing to access properties of
/// the `legend` elements. It inherits properties and methods from the
/// [HTMLElement] interface.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLLegendElement).
extension type HTMLLegendElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLLegendElement] using the tag 'legend'.
  HTMLLegendElement() : _ = document.createElement('legend');

  external HTMLFormElement? get form;
  external String get align;
  external set align(String value);
}

/// The **`ValidityState`** interface represents the _validity states_ that an
/// element can be in, with respect to constraint validation. Together, they
/// help explain why an element's value fails to validate, if it's not valid.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/ValidityState).
extension type ValidityState._(JSObject _) implements JSObject {
  /// The read-only **`valueMissing`** property of a
  /// **[`ValidityState`](https://developer.mozilla.org/en-US/docs/Web/API/ValidityState)**
  /// object indicates if a
  /// [`required`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/required)
  /// control, such as an `input`, `select`, or `textarea`, has an empty value.
  ///
  /// If the `required` attribute is set, and no `option` is selected or a
  /// `<textarea>` or user-editable `<input>` is empty, the `valueMissing`
  /// property will be `true`. The property is only `true` if the field is
  /// required and has no value; if the field is not required, or if the field
  /// is required and has a value, the value is `false`.
  external bool get valueMissing;

  /// The read-only **`typeMismatch`** property of a
  /// **[`ValidityState`](https://developer.mozilla.org/en-US/docs/Web/API/ValidityState)**
  /// object indicates if the value of an `input`, after having been edited by
  /// the user, does not conform to the constraints set by the element's
  /// [`type`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#input_types)
  /// attribute.
  ///
  /// If the `type` attribute expects specific strings, such as the `email` and
  /// `url` types and the value doesn't conform to the constraints set by the
  /// type, the `typeMismatch` property will be true.
  ///
  /// The `email` input type expects one or more valid email addresses,
  /// depending on whether the
  /// [`multiple`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/multiple)
  /// attribute is present. A valid email address includes an email prefix and a
  /// domain, with or without a top level domain. If the value of the email
  /// input is not an empty string, a single valid email address, or one or more
  /// comma separated email address if the
  /// [`multiple`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/multiple)
  /// attribute is present, there is a `typeMismatch`.
  ///
  /// The `url` input type expects one or more valid URLs, depending on whether
  /// the
  /// [`multiple`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/multiple)
  /// attribute is present. A valid URL includes a protocol, optionally with an
  /// IP address, or an optional subdomain, domain, and top level domain
  /// combination. If the value of the URL input is not an empty string, a
  /// single valid URL, or one or more comma separated URLS if the
  /// [`multiple`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/multiple)
  /// attribute is present, there is a `typeMismatch`.
  ///
  /// | Input type                              | Value             | Expected value                                                 |
  /// | --------------------------------------- | ----------------- | -------------------------------------------------------------- |
  /// | `email` | `x@y` or `x@y.z`  | email address, with or without [TLD](https://developer.mozilla.org/en-US/docs/Glossary/TLD) |
  /// | `url`     | `x:` or `x://y.z` | protocol or full URL with protocol                             |
  external bool get typeMismatch;

  /// The read-only **`patternMismatch`** property of a
  /// **[`ValidityState`](https://developer.mozilla.org/en-US/docs/Web/API/ValidityState)**
  /// object indicates if the value of an `input`, after having been edited by
  /// the user, does not conform to the constraints set by the element's
  /// [`pattern`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/pattern)
  /// attribute.
  ///
  /// The `patternMismatch` property will be true if and only if the following
  /// conditions are all true:
  ///
  /// - the field supports the
  ///   [`pattern`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/pattern)
  ///   attribute — which means the `input` is of `type` `text`, `tel`, `email`,
  ///   `url`, `password`, or `search`
  /// - the
  ///   [`pattern`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/pattern)
  ///   attribute contains a valid regular expression
  /// - the `input` value doesn't conform to the constraints set by the
  ///   [`pattern`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/pattern)
  ///   value.
  external bool get patternMismatch;

  /// The read-only **`tooLong`** property of a
  /// **[`ValidityState`](https://developer.mozilla.org/en-US/docs/Web/API/ValidityState)**
  /// object indicates if the value of an `input` or `textarea`, after having
  /// been edited by the user, exceeds the maximum code-unit length established
  /// by the element's
  /// [`maxlength`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/maxlength)
  /// attribute.
  external bool get tooLong;

  /// The read-only **`tooShort`** property of a
  /// **[`ValidityState`](https://developer.mozilla.org/en-US/docs/Web/API/ValidityState)**
  /// object indicates if the value of an `input`, `button`, `select`, `output`,
  /// `fieldset` or `textarea`, after having been edited by the user, is less
  /// than the minimum code-unit length established by the element's `minlength`
  /// attribute.
  external bool get tooShort;

  /// The read-only **`rangeUnderflow`** property of a
  /// **[`ValidityState`](https://developer.mozilla.org/en-US/docs/Web/API/ValidityState)**
  /// object indicates if the value of an `input`, after having been edited by
  /// the user, does not conform to the constraints set by the element's
  /// [`min`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/min)
  /// attribute.
  ///
  /// If the field is numeric in nature, including the `date`, `month`, `week`,
  /// `time`, , `number` and `range` types and a `min` value is set, if the
  /// value doesn't conform to the constraints set by the
  /// [`min`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/step)
  /// value, the `rangeUnderflow` property will be true.
  ///
  /// Given the following:
  ///
  /// ```html
  /// <input type="number" min="20" max="40" step="2" />
  /// ```
  ///
  /// if `value < 20`, `rangeUnderflow` will be true. When `true`, the element
  /// matches the  and  CSS pseudo-classes.
  external bool get rangeUnderflow;

  /// The read-only **`rangeOverflow`** property of a
  /// **[`ValidityState`](https://developer.mozilla.org/en-US/docs/Web/API/ValidityState)**
  /// object indicates if the value of an `input`, after having been edited by
  /// the user, does not conform to the constraints set by the element's
  /// [`max`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/max)
  /// attribute.
  ///
  /// If the field is numeric in nature, including the `date`, `month`, `week`,
  /// `time`, , `number` and `range` types and a `max` value is set, if the
  /// value doesn't conform to the constraints set by the
  /// [`max`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/step)
  /// value, the `rangeOverflow` property will be true.
  ///
  /// Given the following:
  ///
  /// ```html
  /// <input type="number" min="20" max="40" step="2" />
  /// ```
  ///
  /// if `value > 40`, `rangeOverflow` will be true. When `true`, the element
  /// matches the  and  CSS pseudo-classes.
  external bool get rangeOverflow;

  /// The read-only **`stepMismatch`** property of a
  /// **[`ValidityState`](https://developer.mozilla.org/en-US/docs/Web/API/ValidityState)**
  /// object indicates if the value of an `input`, after having been edited by
  /// the user, does not conform to the constraints set by the element's `step`
  /// attribute.
  ///
  /// If the field is numeric in nature, including the `date`, `month`, `week`,
  /// `time`, , `number` and `range` types and the step value is not `any`, if
  /// the value don't doesn't conform to the constraints set by the
  /// [`step`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/step)
  /// and
  /// [`min`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/min)
  /// values, then `stepMismatch` will be true. If the remainder of the form
  /// control's value less the
  /// [`min`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/min)
  /// value, divided by the
  /// [`step`](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/step)
  /// value (which defaults to 1 if omitted) is not zero, there is a mismatch.
  ///
  /// Given the following:
  ///
  /// ```html
  /// <input type="number" min="20" max="40" step="2" />
  /// ```
  ///
  /// if `(value - min) % 2 !== 0`, `stepMismatch` will be true.
  ///
  /// If true, the element matches the  and  CSS pseudo-classes.
  external bool get stepMismatch;

  /// The read-only **`badInput`** property of a
  /// [ValidityState](https://developer.mozilla.org/en-US/docs/Web/API/ValidityState)
  /// object indicates if the user has provided input that the browser is unable
  /// to convert. For example, if you have a number input element whose content
  /// is a string.
  external bool get badInput;
  external bool get customError;
  external bool get valid;
}

/// The **`SubmitEvent`** interface defines the object used to represent an
/// form's [HTMLFormElement.submit_event] event. This event is fired at the
/// `form` when the form's submit action is invoked.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/SubmitEvent).
extension type SubmitEvent._(JSObject _) implements Event, JSObject {
  external factory SubmitEvent(
    String type, [
    SubmitEventInit eventInitDict,
  ]);

  /// The read-only **`submitter`** property found on
  /// the [SubmitEvent] interface specifies the submit button or other element
  /// that was invoked to cause the form to be submitted.
  external HTMLElement? get submitter;
}
extension type SubmitEventInit._(JSObject _) implements EventInit, JSObject {
  external factory SubmitEventInit({
    bool bubbles,
    bool cancelable,
    bool composed,
    HTMLElement? submitter,
  });

  external HTMLElement? get submitter;
  external set submitter(HTMLElement? value);
}

/// The **`FormDataEvent`** interface represents a
/// [`formdata` event](https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement/formdata_event)
/// — such an event is fired on an [HTMLFormElement] object after the entry list
/// representing the form's data is constructed. This happens when the form is
/// submitted, but can also be triggered by the invocation of a
/// [FormData.FormData] constructor.
///
/// This allows a [FormData] object to be quickly obtained in response to a
/// `formdata` event firing, rather than needing to put it together yourself
/// when you wish to submit form data via a method like [fetch] (see
/// [Using FormData objects](https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest_API/Using_FormData_Objects)).
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/FormDataEvent).
extension type FormDataEvent._(JSObject _) implements Event, JSObject {
  external factory FormDataEvent(
    String type,
    FormDataEventInit eventInitDict,
  );

  /// The `formData` read-only property of the [FormDataEvent]
  /// interface contains the [FormData] object representing the data contained
  /// in
  /// the form when the event was fired.
  external FormData get formData;
}
extension type FormDataEventInit._(JSObject _) implements EventInit, JSObject {
  external factory FormDataEventInit({
    bool bubbles,
    bool cancelable,
    bool composed,
    required FormData formData,
  });

  external FormData get formData;
  external set formData(FormData value);
}

/// The **`HTMLDetailsElement`** interface provides special properties (beyond
/// the regular [HTMLElement] interface it also has available to it by
/// inheritance) for manipulating `details` elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLDetailsElement).
extension type HTMLDetailsElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLDetailsElement] using the tag 'details'.
  HTMLDetailsElement() : _ = document.createElement('details');

  external String get name;
  external set name(String value);

  /// The **`open`** property of the
  /// [HTMLDetailsElement] interface is a boolean value reflecting the
  /// [`open`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/details#open)
  /// HTML attribute, indicating whether the `details`'s contents (not counting
  /// the `summary`) is to be shown to the user.
  external bool get open;
  external set open(bool value);
}

/// The **`HTMLDialogElement`** interface provides methods to manipulate
/// `dialog` elements. It inherits properties and methods from the [HTMLElement]
/// interface.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLDialogElement).
extension type HTMLDialogElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLDialogElement] using the tag 'dialog'.
  HTMLDialogElement() : _ = document.createElement('dialog');

  /// The **`show()`** method of the [HTMLDialogElement]
  /// interface displays the dialog modelessly, i.e. still allowing interaction
  /// with content
  /// outside of the dialog.
  external void show();

  /// The **`showModal()`** method of the
  /// [HTMLDialogElement] interface displays the dialog as a modal, over the top
  /// of any other dialogs that might be present. It displays in the , along
  /// with a
  /// pseudo-element. Interaction outside the dialog is blocked and
  /// the content outside it is rendered inert.
  external void showModal();

  /// The **`close()`** method of the [HTMLDialogElement] interface closes the
  /// `dialog`.
  /// An optional string may be passed as an argument, updating the
  /// `returnValue` of the dialog.
  external void close([String returnValue]);

  /// The **`open`** property of the
  /// [HTMLDialogElement] interface is a boolean value reflecting the
  /// [`open`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/dialog#open)
  /// HTML attribute, indicating whether the `dialog` is
  /// available for interaction.
  external bool get open;
  external set open(bool value);

  /// The **`returnValue`** property of the [HTMLDialogElement] interface gets
  /// or sets the return value for the `dialog`, usually to indicate which
  /// button the user pressed to close it.
  external String get returnValue;
  external set returnValue(String value);
}

/// HTML `script` elements expose the **`HTMLScriptElement`** interface, which
/// provides special properties and methods for manipulating the behavior and
/// execution of `<script>` elements (beyond the inherited [HTMLElement]
/// interface).
///
/// JavaScript files should be served with the `text/javascript`
/// [MIME type](https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types),
/// but browsers are lenient and block them only if the script is served with an
/// image type (`image/*`), video type (`video/*`), audio type (`audio/*`), or
/// `text/csv`. If the script is blocked, its element receives an
/// [HTMLElement.error_event] event; otherwise, it receives a
/// [Window.load_event] event.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLScriptElement).
extension type HTMLScriptElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLScriptElement] using the tag 'script'.
  HTMLScriptElement() : _ = document.createElement('script');

  /// The **`supports()`** static method of the [HTMLScriptElement] interface
  /// provides a simple and consistent method to feature-detect what types of
  /// scripts are supported by the user agent.
  ///
  /// The method is expected to return `true` for classic and module scripts,
  /// which are supported by most modern browsers.
  external static bool supports(String type);

  /// The **`src`** property of the [HTMLScriptElement] interface is a string
  /// representing the URL of an external script; this can be used as an
  /// alternative to embedding a script directly within a document.
  ///
  /// It reflects the `src` attribute of the `script` element.
  external String get src;
  external set src(String value);

  /// The **`type`** property of the [HTMLScriptElement] interface is a string
  /// that reflects the type of the script.
  ///
  /// It reflects the `type` attribute of the `script` element.
  external String get type;
  external set type(String value);

  /// The **`noModule`** property of the [HTMLScriptElement] interface is a
  /// boolean value that indicates whether the script should be executed in
  /// browsers that support
  /// [ES modules](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules).
  /// Practically, this can be used to serve fallback scripts to older browsers
  /// that do not support JavaScript modules.
  ///
  /// It reflects the `nomodule` attribute of the `script` element.
  external bool get noModule;
  external set noModule(bool value);

  /// The **`async`** property of the [HTMLScriptElement] interface is a boolean
  /// value that controls how the script should be executed. For classic
  /// scripts, if the `async` property is set to `true`, the external script
  /// will be fetched in parallel to parsing and evaluated as soon as it is
  /// available. For
  /// [module scripts](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules),
  /// if the `async` property is set to `true`, the script and all their
  /// dependencies will be fetched in parallel to parsing and evaluated as soon
  /// as they are available.
  ///
  /// It reflects the `async` attribute of the `script` element.
  external bool get async;
  external set async(bool value);

  /// The **`defer`** property of the [HTMLScriptElement] interface is a boolean
  /// value that controls how the script should be executed. For classic
  /// scripts, if the `defer` property is set to `true`, the external script
  /// will be executed after the document has been parsed, but before firing
  /// [Document.DOMContentLoaded_event] event. For
  /// [module scripts](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules),
  /// the `defer` property has no effect.
  ///
  /// It reflects the `defer` attribute of the `script` element.
  external bool get defer;
  external set defer(bool value);

  /// The **`crossOrigin`** property of the [HTMLScriptElement] interface
  /// reflects the  settings for the script element. For classic scripts from
  /// other [origins](https://developer.mozilla.org/en-US/docs/Glossary/Origin),
  /// this controls if full error information will be exposed. For module
  /// scripts, it controls the script itself and any script it imports. See
  /// [CORS settings attributes](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/crossorigin)
  /// for details.
  external String? get crossOrigin;
  external set crossOrigin(String? value);

  /// The **`text`** property of the [HTMLScriptElement] interface is a string
  /// that reflects the text content inside the `script` element. It acts the
  /// same way as the [Node.textContent] property.
  ///
  /// It reflects the `text` attribute of the `script` element.
  external String get text;
  external set text(String value);

  /// The **`integrity`** property of the [HTMLScriptElement] interface is a
  /// string that contains inline metadata that a browser can use to verify that
  /// a fetched resource has been delivered without unexpected manipulation.
  ///
  /// It reflects the `integrity` attribute of the `script` element.
  external String get integrity;
  external set integrity(String value);

  /// The **`referrerPolicy`** property of the
  /// [HTMLScriptElement] interface reflects the HTML
  /// [`referrerpolicy`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script#referrerpolicy)
  /// of the `script` element, which defines how the referrer is set when
  /// fetching the script and any scripts it imports.
  external String get referrerPolicy;
  external set referrerPolicy(String value);

  /// The **`fetchPriority`** property of the [HTMLScriptElement] interface
  /// represents a hint given to the browser on how it should prioritize
  /// fetching of an external script relative to other external scripts.
  ///
  /// It reflects the `fetchpriority` attribute of the `script` element.
  external String get fetchPriority;
  external set fetchPriority(String value);
  external String get charset;
  external set charset(String value);
  external String get event;
  external set event(String value);
  external String get htmlFor;
  external set htmlFor(String value);
}

/// The **`HTMLTemplateElement`** interface enables access to the contents of an
/// HTML `template` element.
///
/// > **Note:** An HTML parser can create either an `HTMLTemplateElement` or a
/// > [ShadowRoot] when it parses a `template` element, depending on the
/// > `<template>` attributes.
/// > If an `HTMLTemplateElement` is created the "shadow" attributes are
/// > reflected from the template.
/// > However these are not useful, because an `HTMLTemplateElement` is not a
/// > shadow root and cannot subsequently be changed to a shadow root.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLTemplateElement).
extension type HTMLTemplateElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLTemplateElement] using the tag 'template'.
  HTMLTemplateElement() : _ = document.createElement('template');

  /// The **`HTMLTemplateElement.content`** property returns a
  /// `<template>` element's template contents (a
  /// [DocumentFragment]).
  external DocumentFragment get content;

  /// The **`shadowRootMode`** property of the [HTMLTemplateElement] interface
  /// reflects the value of the
  /// [`shadowrootmode`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/template#shadowrootmode)
  /// attribute of the associated
  /// [`<template>`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/template)
  /// element.
  ///
  /// Note that this property is not useful for developers.
  /// If a `<template>` element is used to declaratively create a
  /// [`ShadowRoot`](https://developer.mozilla.org/en-US/docs/Web/API/ShadowRoot),
  /// then this object and property do not exist.
  /// Otherwise, if an `HTMLTemplateElement` is created, the value of this
  /// property is irrelevant because the object is not a shadow root and cannot
  /// subsequently be changed to a shadow root.
  external String get shadowRootMode;
  external set shadowRootMode(String value);

  /// The **`shadowRootDelegatesFocus`** property of the [HTMLTemplateElement]
  /// interface reflects the value of the
  /// [`shadowrootdelegatesfocus`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/template#shadowrootdelegatesfocus)
  /// attribute of the associated
  /// [`<template>`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/template)
  /// element.
  ///
  /// Note that this property is not useful for developers.
  /// If a `<template>` element is used to declaratively create a
  /// [`ShadowRoot`](https://developer.mozilla.org/en-US/docs/Web/API/ShadowRoot),
  /// then this object and property do not exist.
  /// Otherwise, if an `HTMLTemplateElement` is created, the value of this
  /// property is irrelevant because the object is not a shadow root and cannot
  /// subsequently be changed to a shadow root.
  external bool get shadowRootDelegatesFocus;
  external set shadowRootDelegatesFocus(bool value);

  /// The **`shadowRootClonable`** property reflects the value of the
  /// [`shadowrootclonable`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/template#shadowrootclonable)
  /// attribute of the associated
  /// [`<template>`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/template)
  /// element.
  ///
  /// Note that this property is not useful for developers.
  /// If a `<template>` element is used to declaratively create a
  /// [`ShadowRoot`](https://developer.mozilla.org/en-US/docs/Web/API/ShadowRoot),
  /// then this object and property do not exist.
  /// Otherwise, if an `HTMLTemplateElement` is created, the value of this
  /// property is irrelevant because the object is not a shadow root and cannot
  /// subsequently be changed to a shadow root.
  external bool get shadowRootClonable;
  external set shadowRootClonable(bool value);

  /// The **`shadowRootSerializable`** property reflects the value of the
  /// [`shadowrootserializable`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/template#shadowrootserializable)
  /// attribute of the associated
  /// [`<template>`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/template)
  /// element.
  ///
  /// Note that this property is not useful for developers.
  /// If a `<template>` element is used to declaratively create a
  /// [`ShadowRoot`](https://developer.mozilla.org/en-US/docs/Web/API/ShadowRoot),
  /// then this object and property do not exist.
  /// Otherwise, if an `HTMLTemplateElement` is created, the value of this
  /// property is irrelevant because the object is not a shadow root and cannot
  /// subsequently be changed to a shadow root.
  external bool get shadowRootSerializable;
  external set shadowRootSerializable(bool value);
}

/// The **`HTMLSlotElement`** interface of the
/// [Shadow DOM API](https://developer.mozilla.org/en-US/docs/Web/API/Web_components/Using_shadow_DOM)
/// enables access to the name and assigned nodes of an HTML `slot` element.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLSlotElement).
extension type HTMLSlotElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLSlotElement] using the tag 'slot'.
  HTMLSlotElement() : _ = document.createElement('slot');

  /// The **`assignedNodes()`** method of the [HTMLSlotElement] interface
  /// returns a sequence of the nodes assigned to this slot.
  ///
  /// If the `flatten` option is set to `true`, it returns a sequence of both
  /// the nodes assigned to this slot, as well as the nodes assigned to any
  /// other slots that are descendants of this slot. If no assigned nodes are
  /// found, it returns the slot's fallback content.
  external JSArray<Node> assignedNodes([AssignedNodesOptions options]);

  /// The **`assignedElements()`** method of the [HTMLSlotElement]
  /// interface returns a sequence of the elements assigned to this slot (and no
  /// other nodes).
  ///
  /// If the `flatten` option is set to `true`, it returns a sequence of both
  /// the elements assigned to this slot, as well as the elements assigned to
  /// any other slots that are descendants of this slot. If no assigned elements
  /// are found, it returns the slot's fallback content.
  external JSArray<Element> assignedElements([AssignedNodesOptions options]);

  /// The **`assign()`** method of the [HTMLSlotElement] interface sets the
  /// slot's _manually assigned nodes_ to an ordered set of slottables. The
  /// manually assigned nodes set is initially empty until nodes are assigned
  /// using `assign()`.
  ///
  /// > **Note:** you cannot mix manually (imperative) and named (declarative,
  /// > automatic) slot assignments. Therefore, for this method to work, the
  /// > shadow tree needs to have been
  /// > [created](https://developer.mozilla.org/en-US/docs/Web/API/Element/attachShadow)
  /// > with the `slotAssignment: "manual"` option.
  external void assign(JSObject nodes);

  /// The **`name`** property of the [HTMLSlotElement]
  /// interface returns or sets the slot name. A slot is a placeholder inside a
  /// web component
  /// that users can fill with their own markup.
  external String get name;
  external set name(String value);
}
extension type AssignedNodesOptions._(JSObject _) implements JSObject {
  external factory AssignedNodesOptions({bool flatten});

  external bool get flatten;
  external set flatten(bool value);
}

/// The **`HTMLCanvasElement`** interface provides properties and methods for
/// manipulating the layout and presentation of `canvas` elements. The
/// `HTMLCanvasElement` interface also inherits the properties and methods of
/// the [HTMLElement] interface.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement).
extension type HTMLCanvasElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLCanvasElement] using the tag 'canvas'.
  HTMLCanvasElement() : _ = document.createElement('canvas');

  /// The
  /// **`HTMLCanvasElement.getContext()`** method returns a drawing
  /// context on the canvas, or
  /// [`null`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/null)
  /// if the context identifier is not
  /// supported, or the canvas has already been set to a different context mode.
  ///
  /// Later calls to this method on the same canvas element, with the same
  /// `contextType` argument, will always return the same drawing context
  /// instance
  /// as was returned the first time the method was invoked. It is not possible
  /// to get a
  /// different drawing context object on a given canvas element.
  external RenderingContext? getContext(
    String contextId, [
    JSAny? options,
  ]);

  /// The **`HTMLCanvasElement.toDataURL()`** method returns a
  /// [data URL](https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URLs)
  /// containing a representation of the image in the format specified by the
  /// `type` parameter.
  ///
  /// The desired file format and image quality may be specified.
  /// If the file format is not specified, or if the given format is not
  /// supported, then the data will be exported as `image/png`.
  /// In other words, if the returned value starts with `data:image/png` for any
  /// other requested `type`, then that format is not supported.
  ///
  /// Browsers are required to support `image/png`; many will support additional
  /// formats including `image/jpeg` and `image/webp`.
  ///
  /// The created image data will have a resolution of 96dpi for file formats
  /// that support encoding resolution metadata.
  external String toDataURL([
    String type,
    JSAny? quality,
  ]);

  /// The **`HTMLCanvasElement.toBlob()`** method creates a [Blob] object
  /// representing the image contained in the canvas.
  /// This file may be cached on the disk or stored in memory at the discretion
  /// of the user agent.
  ///
  /// The desired file format and image quality may be specified.
  /// If the file format is not specified, or if the given format is not
  /// supported, then the data will be exported as `image/png`.
  /// Browsers are required to support `image/png`; many will support additional
  /// formats including `image/jpeg` and `image/webp`.
  ///
  /// The created image will have a resolution of 96dpi for file formats that
  /// support encoding resolution metadata.
  external void toBlob(
    BlobCallback callback, [
    String type,
    JSAny? quality,
  ]);

  /// The **`HTMLCanvasElement.transferControlToOffscreen()`** method transfers
  /// control to an [OffscreenCanvas] object, either on the main thread or on a
  /// worker.
  external OffscreenCanvas transferControlToOffscreen();

  /// The **`captureStream()`** method of the [HTMLCanvasElement] interface
  /// returns a [MediaStream]
  /// which includes a [CanvasCaptureMediaStreamTrack] containing a real-time
  /// video capture of the canvas's contents.
  external MediaStream captureStream([num frameRequestRate]);

  /// The **`HTMLCanvasElement.width`** property is a
  /// positive `integer` reflecting the
  /// [`width`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/canvas#width)
  /// HTML
  /// attribute of the `canvas` element interpreted in CSS pixels. When the
  /// attribute is not specified, or if it is set to an invalid value, like a
  /// negative, the
  /// default value of `300` is used.
  ///
  /// When the `width` property is set the drawing buffer is always reset to
  /// blank — this is true for all context types, and even when the width is set
  /// to the same value. If you need to restore the previous content, you can
  /// save it via [CanvasRenderingContext2D.getImageData] and restore it via
  /// [CanvasRenderingContext2D.putImageData].
  ///
  /// This is one of the two properties, the other being
  /// [HTMLCanvasElement.height], that controls the size of the canvas.
  external int get width;
  external set width(int value);

  /// The **`HTMLCanvasElement.height`** property is a
  /// positive `integer` reflecting the
  /// [`height`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/canvas#height)
  /// HTML
  /// attribute of the `canvas` element interpreted in CSS pixels. When the
  /// attribute is not specified, or if it is set to an invalid value, like a
  /// negative, the
  /// default value of `150` is used.
  ///
  /// When the `height` property is set the drawing buffer is always reset to
  /// blank — this is true for all context types, and even when the height is
  /// set to the same value. If you need to restore the previous content, you
  /// can save it via [CanvasRenderingContext2D.getImageData] and restore it via
  /// [CanvasRenderingContext2D.putImageData].
  ///
  /// This is one of the two properties, the other being
  /// [HTMLCanvasElement.width], that controls the size of the canvas.
  external int get height;
  external set height(int value);
}
extension type CanvasRenderingContext2DSettings._(JSObject _)
    implements JSObject {
  external factory CanvasRenderingContext2DSettings({
    bool alpha,
    bool desynchronized,
    PredefinedColorSpace colorSpace,
    bool willReadFrequently,
  });

  external bool get alpha;
  external set alpha(bool value);
  external bool get desynchronized;
  external set desynchronized(bool value);
  external PredefinedColorSpace get colorSpace;
  external set colorSpace(PredefinedColorSpace value);
  external bool get willReadFrequently;
  external set willReadFrequently(bool value);
}

/// The **`CanvasRenderingContext2D`** interface, part of the
/// [Canvas API](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API),
/// provides the 2D rendering context for the drawing surface of a `canvas`
/// element.
/// It is used for drawing shapes, text, images, and other objects.
///
/// The interface's properties and methods are described in the reference
/// section of this page.
/// The
/// [Canvas tutorial](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial)
/// has more explanation, examples, and resources, as well.
///
/// For
/// [`OffscreenCanvas`](https://developer.mozilla.org/en-US/docs/Web/API/OffscreenCanvas),
/// there is an equivalent interface that provides the rendering context.
/// The offscreen rendering context inherits most of the same properties and
/// methods as the `CanvasRenderingContext2D` and is described in more detail in
/// the [OffscreenCanvasRenderingContext2D] reference page.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D).
extension type CanvasRenderingContext2D._(JSObject _) implements JSObject {
  /// The **`CanvasRenderingContext2D.getContextAttributes()`** method returns
  /// an object that contains attributes used by the context.
  ///
  /// Note that context attributes may be requested when creating the context
  /// with
  /// [`HTMLCanvasElement.getContext()`](https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/getContext),
  /// but the attributes that are actually supported and used may differ.
  external CanvasRenderingContext2DSettings getContextAttributes();

  /// The
  /// **`CanvasRenderingContext2D.save()`**
  /// method of the Canvas 2D API saves the entire state of the canvas by
  /// pushing the current
  /// state onto a stack.
  ///
  /// ### The drawing state
  ///
  /// The drawing state that gets saved onto a stack consists of:
  ///
  /// - The current transformation matrix.
  /// - The current clipping region.
  /// - The current dash list.
  /// - The current values of the following attributes:
  /// [CanvasRenderingContext2D.strokeStyle],
  /// [CanvasRenderingContext2D.fillStyle],
  /// [CanvasRenderingContext2D.globalAlpha],
  /// [CanvasRenderingContext2D.lineWidth],
  /// [CanvasRenderingContext2D.lineCap],
  /// [CanvasRenderingContext2D.lineJoin],
  /// [CanvasRenderingContext2D.miterLimit],
  /// [CanvasRenderingContext2D.lineDashOffset],
  /// [CanvasRenderingContext2D.shadowOffsetX],
  /// [CanvasRenderingContext2D.shadowOffsetY],
  /// [CanvasRenderingContext2D.shadowBlur],
  /// [CanvasRenderingContext2D.shadowColor],
  /// [CanvasRenderingContext2D.globalCompositeOperation],
  /// [CanvasRenderingContext2D.font],
  /// [CanvasRenderingContext2D.textAlign],
  /// [CanvasRenderingContext2D.textBaseline],
  /// [CanvasRenderingContext2D.direction],
  /// [CanvasRenderingContext2D.imageSmoothingEnabled].
  external void save();

  /// The
  /// **`CanvasRenderingContext2D.restore()`**
  /// method of the Canvas 2D API restores the most recently saved canvas state
  /// by popping the
  /// top entry in the drawing state stack. If there is no saved state, this
  /// method does
  /// nothing.
  ///
  /// For more information about the
  /// [drawing state](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/save#drawing_state),
  /// see [CanvasRenderingContext2D.save].
  external void restore();

  /// The **`CanvasRenderingContext2D.reset()`** method of the Canvas 2D API
  /// resets the rendering context to its default state, allowing it to be
  /// reused for drawing something else without having to explicitly reset all
  /// the properties.
  ///
  /// Resetting clears the backing buffer, drawing state stack, any defined
  /// paths, and styles.
  /// This includes the current
  /// [transformation](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D#transformations)
  /// matrix,
  /// [compositing](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D#compositing)
  /// properties, clipping region, dash list,
  /// [line styles](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D#line_styles),
  /// [text styles](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D#text_styles),
  /// [shadows](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D#shadows),
  /// [image smoothing](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D#image_smoothing),
  /// [filters](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D#filters),
  /// and so on.
  external void reset();

  /// The **`CanvasRenderingContext2D.isContextLost()`** method of the Canvas 2D
  /// API returns `true` if the rendering context is lost (and has not yet been
  /// reset).
  /// This might occur due to driver crashes, running out of memory, and so on.
  ///
  /// If the user agent detects that the canvas backing storage is lost it will
  /// fire the
  /// [`contextlost` event](https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/contextlost_event)
  /// at the associated
  /// [`HTMLCanvasElement`](https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement).
  /// If this event is not cancelled it will attempt to reset the backing
  /// storage to the default state (this is equivalent to calling
  /// [CanvasRenderingContext2D.reset]).
  /// On success it will fire the
  /// [`contextrestored` event](https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/contextrestored_event),
  /// indicating that the context is ready to reinitialize and redraw.
  external bool isContextLost();

  /// The
  /// **`CanvasRenderingContext2D.scale()`**
  /// method of the Canvas 2D API adds a scaling transformation to the canvas
  /// units
  /// horizontally and/or vertically.
  ///
  /// By default, one unit on the canvas is exactly one pixel. A scaling
  /// transformation
  /// modifies this behavior. For instance, a scaling factor of 0.5 results in a
  /// unit size of
  /// 0.5 pixels; shapes are thus drawn at half the normal size. Similarly, a
  /// scaling factor
  /// of 2.0 increases the unit size so that one unit becomes two pixels; shapes
  /// are thus
  /// drawn at twice the normal size.
  external void scale(
    num x,
    num y,
  );

  /// The
  /// **`CanvasRenderingContext2D.rotate()`**
  /// method of the Canvas 2D API adds a rotation to the transformation matrix.
  external void rotate(num angle);

  /// The
  /// **`CanvasRenderingContext2D.translate()`**
  /// method of the Canvas 2D API adds a translation transformation to the
  /// current matrix.
  external void translate(
    num x,
    num y,
  );

  /// The
  /// **`CanvasRenderingContext2D.transform()`**
  /// method of the Canvas 2D API multiplies the current transformation with the
  /// matrix
  /// described by the arguments of this method. This lets you scale, rotate,
  /// translate
  /// (move), and skew the context.
  ///
  /// > **Note:** See also the
  /// > [CanvasRenderingContext2D.setTransform] method, which
  /// > resets the current transform to the identity matrix and then invokes
  /// > `transform()`.
  external void transform(
    num a,
    num b,
    num c,
    num d,
    num e,
    num f,
  );

  /// The **`CanvasRenderingContext2D.getTransform()`** method of the Canvas 2D
  /// API retrieves the current transformation matrix being applied to the
  /// context.
  external DOMMatrix getTransform();

  /// The
  /// **`CanvasRenderingContext2D.setTransform()`**
  /// method of the Canvas 2D API resets (overrides) the current transformation
  /// to the
  /// identity matrix, and then invokes a transformation described by the
  /// arguments of this
  /// method. This lets you scale, rotate, translate (move), and skew the
  /// context.
  ///
  /// > **Note:** See also the [CanvasRenderingContext2D.transform] method;
  /// > instead of overriding the current transform matrix, it
  /// > multiplies it with a given one.
  external void setTransform([
    JSAny aOrTransform,
    num b,
    num c,
    num d,
    num e,
    num f,
  ]);

  /// The
  /// **`CanvasRenderingContext2D.resetTransform()`**
  /// method of the Canvas 2D API resets the current transform to the identity
  /// matrix.
  external void resetTransform();

  /// The
  /// **`CanvasRenderingContext2D.createLinearGradient()`**
  /// method of the Canvas 2D API creates a gradient along the line connecting
  /// two given
  /// coordinates.
  ///
  /// ![The gradient transitions colors along the gradient line, starting at
  /// point x0, y0 and going to x1, y1, even if those points extend the gradient
  /// line beyond the edges of the element on which the gradient is
  /// drawn.](mdn-canvas-lineargradient.png)
  ///
  /// This method returns a linear [CanvasGradient]. To be applied to a shape,
  /// the gradient must first be assigned to the
  /// [CanvasRenderingContext2D.fillStyle] or
  /// [CanvasRenderingContext2D.strokeStyle] properties.
  ///
  /// > **Note:** Gradient coordinates are global, i.e., relative to the current
  /// > coordinate space. When applied to a shape, the coordinates are NOT
  /// > relative to the
  /// > shape's coordinates.
  external CanvasGradient createLinearGradient(
    num x0,
    num y0,
    num x1,
    num y1,
  );

  /// The
  /// **`CanvasRenderingContext2D.createRadialGradient()`**
  /// method of the Canvas 2D API creates a radial gradient using the size and
  /// coordinates of
  /// two circles.
  ///
  /// This method returns a [CanvasGradient]. To be applied to a shape, the
  /// gradient must first be assigned to the
  /// [CanvasRenderingContext2D.fillStyle] or
  /// [CanvasRenderingContext2D.strokeStyle] properties.
  ///
  /// > **Note:** Gradient coordinates are global, i.e., relative to the current
  /// > coordinate space. When applied to a shape, the coordinates are NOT
  /// > relative to the
  /// > shape's coordinates.
  external CanvasGradient createRadialGradient(
    num x0,
    num y0,
    num r0,
    num x1,
    num y1,
    num r1,
  );

  /// The **`CanvasRenderingContext2D.createConicGradient()`** method of the
  /// Canvas 2D API creates a gradient around a point with given coordinates.
  ///
  /// This method returns a conic [CanvasGradient]. To be applied to a shape,
  /// the gradient must first be assigned to the
  /// [CanvasRenderingContext2D.fillStyle] or
  /// [CanvasRenderingContext2D.strokeStyle] properties.
  ///
  /// > **Note:** Gradient coordinates are global, i.e., relative to the current
  /// > coordinate space. When applied to a shape, the coordinates are NOT
  /// > relative to the shape's coordinates.
  external CanvasGradient createConicGradient(
    num startAngle,
    num x,
    num y,
  );

  /// The **`CanvasRenderingContext2D.createPattern()`** method of the Canvas 2D
  /// API creates a pattern using the specified image and repetition.
  /// This method returns a [CanvasPattern].
  ///
  /// This method doesn't draw anything to the canvas directly.
  /// The pattern it creates must be assigned to the
  /// [CanvasRenderingContext2D.fillStyle] or
  /// [CanvasRenderingContext2D.strokeStyle] properties, after which it is
  /// applied to any subsequent drawing.
  external CanvasPattern? createPattern(
    CanvasImageSource image,
    String repetition,
  );

  /// The
  /// **`CanvasRenderingContext2D.clearRect()`**
  /// method of the Canvas 2D API erases the pixels in a rectangular area by
  /// setting them to
  /// transparent black.
  ///
  /// > **Note:** Be aware that `clearRect()` may cause unintended
  /// > side effects if you're not
  /// > [using paths properly](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial/Drawing_shapes#drawing_paths).
  /// > Make sure to call
  /// > [CanvasRenderingContext2D.beginPath] before starting to
  /// > draw new items after calling `clearRect()`.
  external void clearRect(
    num x,
    num y,
    num w,
    num h,
  );

  /// The
  /// **`CanvasRenderingContext2D.fillRect()`**
  /// method of the Canvas 2D API draws a rectangle that is filled according to
  /// the current
  /// [CanvasRenderingContext2D.fillStyle].
  ///
  /// This method draws directly to the canvas without modifying the current
  /// path, so any
  /// subsequent [CanvasRenderingContext2D.fill] or
  /// [CanvasRenderingContext2D.stroke] calls will have no effect
  /// on it.
  external void fillRect(
    num x,
    num y,
    num w,
    num h,
  );

  /// The
  /// **`CanvasRenderingContext2D.strokeRect()`**
  /// method of the Canvas 2D API draws a rectangle that is stroked (outlined)
  /// according to
  /// the current [CanvasRenderingContext2D.strokeStyle] and other
  /// context settings.
  ///
  /// This method draws directly to the canvas without modifying the current
  /// path, so any
  /// subsequent [CanvasRenderingContext2D.fill] or
  /// [CanvasRenderingContext2D.stroke] calls will have no effect
  /// on it.
  external void strokeRect(
    num x,
    num y,
    num w,
    num h,
  );

  /// The
  /// **`CanvasRenderingContext2D.beginPath()`**
  /// method of the Canvas 2D API starts a new path by emptying the list of
  /// sub-paths. Call
  /// this method when you want to create a new path.
  ///
  /// > **Note:** To create a new sub-path, i.e., one matching the current
  /// > canvas state, you can use [CanvasRenderingContext2D.moveTo].
  external void beginPath();

  /// The
  /// **`CanvasRenderingContext2D.fill()`**
  /// method of the Canvas 2D API fills the current or given path with the
  /// current
  /// [CanvasRenderingContext2D.fillStyle].
  external void fill([
    JSAny fillRuleOrPath,
    CanvasFillRule fillRule,
  ]);

  /// The
  /// **`CanvasRenderingContext2D.stroke()`**
  /// method of the Canvas 2D API strokes (outlines) the current or given path
  /// with the
  /// current stroke style.
  ///
  /// Strokes are aligned to the center of a path; in other words, half of the
  /// stroke is
  /// drawn on the inner side, and half on the outer side.
  ///
  /// The stroke is drawn using the
  /// [non-zero winding rule](https://en.wikipedia.org/wiki/Nonzero-rule), which
  /// means that path intersections will still get filled.
  external void stroke([Path2D path]);

  /// The
  /// **`CanvasRenderingContext2D.clip()`**
  /// method of the Canvas 2D API turns the current or given path into the
  /// current clipping
  /// region. The previous clipping region, if any, is intersected with the
  /// current or given
  /// path to create the new clipping region.
  ///
  /// In the image below, the red outline represents a clipping region shaped
  /// like a star.
  /// Only those parts of the checkerboard pattern that are within the clipping
  /// region get
  /// drawn.
  ///
  /// ![Star-shaped clipping region](canvas_clipping_path.png)
  ///
  /// > **Note:** Be aware that the clipping region is only constructed from
  /// > shapes added to the path. It doesn't work with shape primitives drawn
  /// > directly to the
  /// > canvas, such as [CanvasRenderingContext2D.fillRect].
  /// > Instead, you'd have to use [CanvasRenderingContext2D.rect] to
  /// > add a rectangular shape to the path before calling `clip()`.
  ///
  /// > **Note:** Clip paths cannot be reverted directly. You must save your
  /// > canvas state using [CanvasRenderingContext2D.save] before calling
  /// > `clip()`, and restore it once you have finished drawing in the clipped
  /// > area using [CanvasRenderingContext2D.restore].
  external void clip([
    JSAny fillRuleOrPath,
    CanvasFillRule fillRule,
  ]);

  /// The
  /// **`CanvasRenderingContext2D.isPointInPath()`**
  /// method of the Canvas 2D API reports whether or not the specified point is
  /// contained in
  /// the current path.
  external bool isPointInPath(
    JSAny pathOrX,
    num xOrY, [
    JSAny fillRuleOrY,
    CanvasFillRule fillRule,
  ]);

  /// The
  /// **`CanvasRenderingContext2D.isPointInStroke()`**
  /// method of the Canvas 2D API reports whether or not the specified point is
  /// inside the
  /// area contained by the stroking of a path.
  external bool isPointInStroke(
    JSAny pathOrX,
    num xOrY, [
    num y,
  ]);

  /// The
  /// **`CanvasRenderingContext2D.drawFocusIfNeeded()`**
  /// method of the Canvas 2D API draws a focus ring around the current or given
  /// path, if the
  /// specified element is focused.
  external void drawFocusIfNeeded(
    JSObject elementOrPath, [
    Element element,
  ]);

  /// The [CanvasRenderingContext2D] method
  /// **`fillText()`**, part of the Canvas 2D API, draws a text string
  /// at the specified coordinates, filling the string's characters with the
  /// current
  /// [CanvasRenderingContext2D.fillStyle]. An optional parameter
  /// allows specifying a maximum width for the rendered text, which the  will
  /// achieve by condensing the text or by using a lower font size.
  ///
  /// This method draws directly to the canvas without modifying the current
  /// path, so any
  /// subsequent [CanvasRenderingContext2D.fill] or
  /// [CanvasRenderingContext2D.stroke] calls will have no effect
  /// on it.
  ///
  /// The text is rendered using the font and text layout configuration as
  /// defined by the
  /// [CanvasRenderingContext2D.font],
  /// [CanvasRenderingContext2D.textAlign],
  /// [CanvasRenderingContext2D.textBaseline], and
  /// [CanvasRenderingContext2D.direction] properties.
  ///
  /// > **Note:** To draw the outlines of the characters in a string, call the
  /// > context's
  /// > [CanvasRenderingContext2D.strokeText] method.
  external void fillText(
    String text,
    num x,
    num y, [
    num maxWidth,
  ]);

  /// The [CanvasRenderingContext2D] method
  /// **`strokeText()`**, part of the Canvas 2D API, strokes — that
  /// is, draws the outlines of — the characters of a text string at the
  /// specified
  /// coordinates. An optional parameter allows specifying a maximum width for
  /// the rendered
  /// text, which the  will achieve by condensing the text or by
  /// using a lower font size.
  ///
  /// This method draws directly to the canvas without modifying the current
  /// path, so any
  /// subsequent [CanvasRenderingContext2D.fill] or
  /// [CanvasRenderingContext2D.stroke] calls will have no effect
  /// on it.
  ///
  /// > **Note:** Use the [CanvasRenderingContext2D.fillText] method to
  /// > fill the text characters rather than having just their outlines drawn.
  external void strokeText(
    String text,
    num x,
    num y, [
    num maxWidth,
  ]);

  /// The
  /// `CanvasRenderingContext2D.measureText()`
  /// method returns a [TextMetrics] object that contains information about the
  /// measured text (such as its width, for example).
  external TextMetrics measureText(String text);

  /// The **`CanvasRenderingContext2D.drawImage()`** method of the
  /// Canvas 2D API provides different ways to draw an image onto the canvas.
  external void drawImage(
    CanvasImageSource image,
    num dxOrSx,
    num dyOrSy, [
    num dwOrSw,
    num dhOrSh,
    num dx,
    num dy,
    num dw,
    num dh,
  ]);

  /// The **`CanvasRenderingContext2D.createImageData()`** method of
  /// the Canvas 2D API creates a new, blank [ImageData] object with the
  /// specified dimensions. All of the pixels in the new object are transparent
  /// black.
  external ImageData createImageData(
    JSAny imagedataOrSw, [
    int sh,
    ImageDataSettings settings,
  ]);

  /// The [CanvasRenderingContext2D] method
  /// **`getImageData()`** of the Canvas 2D API returns an
  /// [ImageData] object representing the underlying pixel data for a specified
  /// portion of the canvas.
  ///
  /// This method is not affected by the canvas's transformation matrix. If the
  /// specified
  /// rectangle extends outside the bounds of the canvas, the pixels outside the
  /// canvas are
  /// transparent black in the returned `ImageData` object.
  ///
  /// > **Note:** Image data can be painted onto a canvas using the
  /// > [CanvasRenderingContext2D.putImageData] method.
  ///
  /// You can find more information about `getImageData()` and general
  /// manipulation of canvas contents in
  /// [Pixel manipulation with canvas](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial/Pixel_manipulation_with_canvas).
  external ImageData getImageData(
    int sx,
    int sy,
    int sw,
    int sh, [
    ImageDataSettings settings,
  ]);

  /// The **`CanvasRenderingContext2D.putImageData()`**
  /// method of the Canvas 2D API paints data from the given [ImageData] object
  /// onto the canvas. If a dirty rectangle is provided, only the pixels from
  /// that rectangle
  /// are painted. This method is not affected by the canvas transformation
  /// matrix.
  ///
  /// > **Note:** Image data can be retrieved from a canvas using the
  /// > [CanvasRenderingContext2D.getImageData] method.
  ///
  /// You can find more information about `putImageData()` and general
  /// manipulation of canvas contents in the article
  /// [Pixel manipulation with canvas](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial/Pixel_manipulation_with_canvas).
  external void putImageData(
    ImageData imagedata,
    int dx,
    int dy, [
    int dirtyX,
    int dirtyY,
    int dirtyWidth,
    int dirtyHeight,
  ]);

  /// The **`setLineDash()`** method of the Canvas 2D API's
  /// [CanvasRenderingContext2D] interface sets the line dash pattern used when
  /// stroking lines. It uses an array of values that specify alternating
  /// lengths of lines
  /// and gaps which describe the pattern.
  ///
  /// > **Note:** To return to using solid lines, set the line dash list to an
  /// > empty array.
  external void setLineDash(JSArray<JSNumber> segments);

  /// The **`getLineDash()`** method of the Canvas 2D API's
  /// [CanvasRenderingContext2D] interface gets the current line dash pattern.
  external JSArray<JSNumber> getLineDash();

  /// The
  /// **`CanvasRenderingContext2D.closePath()`**
  /// method of the Canvas 2D API attempts to add a straight line from the
  /// current point to
  /// the start of the current sub-path. If the shape has already been closed or
  /// has only one
  /// point, this function does nothing.
  ///
  /// This method doesn't draw anything to the canvas directly. You can render
  /// the path using
  /// the [CanvasRenderingContext2D.stroke] or
  /// [CanvasRenderingContext2D.fill] methods.
  external void closePath();

  /// The
  /// **`CanvasRenderingContext2D.moveTo()`**
  /// method of the Canvas 2D API begins a new sub-path at the point specified
  /// by the given
  /// `(x, y)` coordinates.
  external void moveTo(
    num x,
    num y,
  );

  /// The [CanvasRenderingContext2D] method
  /// **`lineTo()`**, part of the Canvas 2D API, adds a straight line
  /// to the current sub-path by connecting the sub-path's last point to the
  /// specified
  /// `(x, y)` coordinates.
  ///
  /// Like other methods that modify the current path, this method does not
  /// directly render
  /// anything. To draw the path onto a canvas, you can use the
  /// [CanvasRenderingContext2D.fill] or
  /// [CanvasRenderingContext2D.stroke] methods.
  external void lineTo(
    num x,
    num y,
  );

  /// The
  /// **`CanvasRenderingContext2D.quadraticCurveTo()`**
  /// method of the Canvas 2D API adds a quadratic [Bézier
  /// curve](https://developer.mozilla.org/en-US/docs/Glossary/Bezier_curve) to
  /// the current
  /// sub-path. It requires two points: the first one is a control point and the
  /// second one is
  /// the end point. The starting point is the latest point in the current path,
  /// which can be
  /// changed using [CanvasRenderingContext2D.moveTo] before creating
  /// the quadratic Bézier curve.
  external void quadraticCurveTo(
    num cpx,
    num cpy,
    num x,
    num y,
  );

  /// The
  /// **`CanvasRenderingContext2D.bezierCurveTo()`**
  /// method of the Canvas 2D API adds a cubic [Bézier
  /// curve](https://developer.mozilla.org/en-US/docs/Glossary/Bezier_curve) to
  /// the current
  /// sub-path. It requires three points: the first two are control points and
  /// the third one
  /// is the end point. The starting point is the latest point in the current
  /// path, which can
  /// be changed using [CanvasRenderingContext2D.moveTo] before
  /// creating the Bézier curve.
  external void bezierCurveTo(
    num cp1x,
    num cp1y,
    num cp2x,
    num cp2y,
    num x,
    num y,
  );

  /// The **`CanvasRenderingContext2D.arcTo()`** method of the Canvas 2D API
  /// adds a circular arc to the current sub-path, using the given control
  /// points and radius.
  /// The arc is automatically connected to the path's latest point with a
  /// straight line if necessary, for example if the starting point and control
  /// points are in a line.
  ///
  /// This method is commonly used for making rounded corners.
  ///
  /// > **Note:** You may get unexpected results when using a
  /// > relatively large radius: the arc's connecting line will go in whatever
  /// > direction it
  /// > must to meet the specified radius.
  external void arcTo(
    num x1,
    num y1,
    num x2,
    num y2,
    num radius,
  );

  /// The
  /// **`CanvasRenderingContext2D.rect()`**
  /// method of the Canvas 2D API adds a rectangle to the current path.
  ///
  /// Like other methods that modify the current path, this method does not
  /// directly render
  /// anything. To draw the rectangle onto a canvas, you can use the
  /// [CanvasRenderingContext2D.fill] or
  /// [CanvasRenderingContext2D.stroke] methods.
  ///
  /// > **Note:** To both create and render a rectangle in one step, use the
  /// > [CanvasRenderingContext2D.fillRect] or
  /// > [CanvasRenderingContext2D.strokeRect] methods.
  external void rect(
    num x,
    num y,
    num w,
    num h,
  );

  /// The **`CanvasRenderingContext2D.roundRect()`** method of the Canvas 2D API
  /// adds a rounded rectangle to the current path.
  ///
  /// The radii of the corners can be specified in much the same way as the CSS
  /// [`border-radius`](https://developer.mozilla.org/en-US/docs/Web/CSS/border-radius)
  /// property.
  ///
  /// Like other methods that modify the current path, this method does not
  /// directly render anything.
  /// To draw the rounded rectangle onto a canvas, you can use the
  /// [CanvasRenderingContext2D.fill] or [CanvasRenderingContext2D.stroke]
  /// methods.
  external void roundRect(
    num x,
    num y,
    num w,
    num h, [
    JSAny radii,
  ]);

  /// The
  /// **`CanvasRenderingContext2D.arc()`**
  /// method of the
  /// [Canvas 2D API](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D)
  /// adds a circular arc to the current sub-path.
  external void arc(
    num x,
    num y,
    num radius,
    num startAngle,
    num endAngle, [
    bool counterclockwise,
  ]);

  /// The
  /// **`CanvasRenderingContext2D.ellipse()`**
  /// method of the Canvas 2D API adds an elliptical arc to the current
  /// sub-path.
  external void ellipse(
    num x,
    num y,
    num radiusX,
    num radiusY,
    num rotation,
    num startAngle,
    num endAngle, [
    bool counterclockwise,
  ]);

  /// The **`CanvasRenderingContext2D.canvas`** property, part of the
  /// [Canvas API](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API),
  /// is a read-only reference to the
  /// [HTMLCanvasElement] object that is associated with a given context. It
  /// might be
  /// [`null`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/null)
  /// if there is no associated `canvas` element.
  external HTMLCanvasElement get canvas;

  /// The
  /// **`CanvasRenderingContext2D.globalAlpha`**
  /// property of the Canvas 2D API specifies the alpha (transparency) value
  /// that is applied
  /// to shapes and images before they are drawn onto the canvas.
  ///
  /// > **Note:** See also the chapter
  /// > [Applying styles and color](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial/Applying_styles_and_colors)
  /// > in the
  /// > [Canvas Tutorial](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial).
  external double get globalAlpha;
  external set globalAlpha(num value);

  /// The
  /// **`CanvasRenderingContext2D.globalCompositeOperation`**
  /// property of the Canvas 2D API sets the type of compositing operation to
  /// apply when
  /// drawing new shapes.
  ///
  /// See also
  /// [Compositing and clipping](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial/Compositing)
  /// in the
  /// [Canvas Tutorial](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial).
  external String get globalCompositeOperation;
  external set globalCompositeOperation(String value);

  /// The **`imageSmoothingEnabled`** property of the
  /// [CanvasRenderingContext2D] interface, part of the
  /// [Canvas API](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API),
  /// determines whether scaled images
  /// are smoothed (`true`, default) or not (`false`). On getting the
  /// `imageSmoothingEnabled` property, the last value it was set to is
  /// returned.
  ///
  /// This property is useful for games and other apps that use pixel art. When
  /// enlarging
  /// images, the default resizing algorithm will blur the pixels. Set this
  /// property to
  /// `false` to retain the pixels' sharpness.
  ///
  /// > **Note:** You can adjust the smoothing quality with the
  /// > [CanvasRenderingContext2D.imageSmoothingQuality]
  /// > property.
  external bool get imageSmoothingEnabled;
  external set imageSmoothingEnabled(bool value);

  /// The **`imageSmoothingQuality`** property of the
  /// [CanvasRenderingContext2D] interface, part of the
  /// [Canvas API](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API),
  /// lets you set the quality of
  /// image smoothing.
  ///
  /// > **Note:** For this property to have an effect,
  /// > [CanvasRenderingContext2D.imageSmoothingEnabled]
  /// > must be `true`.
  external ImageSmoothingQuality get imageSmoothingQuality;
  external set imageSmoothingQuality(ImageSmoothingQuality value);

  /// The **`CanvasRenderingContext2D.strokeStyle`** property of the
  /// Canvas 2D API specifies the color, gradient, or pattern to use for the
  /// strokes
  /// (outlines) around shapes. The default is `#000` (black).
  ///
  /// > **Note:** For more examples of stroke and fill styles, see
  /// > [Applying styles and color](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial/Applying_styles_and_colors)
  /// > in the
  /// > [Canvas tutorial](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial).
  external JSAny get strokeStyle;
  external set strokeStyle(JSAny value);

  /// The
  /// **`CanvasRenderingContext2D.fillStyle`**
  /// property of the
  /// [Canvas 2D API](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API)
  /// specifies the
  /// color, gradient, or pattern to use inside shapes. The default style is
  /// `#000`
  /// (black).
  ///
  /// > **Note:** For more examples of fill and stroke styles, see
  /// > [Applying styles and color](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial/Applying_styles_and_colors)
  /// > in the
  /// > [Canvas tutorial](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial).
  external JSAny get fillStyle;
  external set fillStyle(JSAny value);

  /// The
  /// **`CanvasRenderingContext2D.shadowOffsetX`**
  /// property of the Canvas 2D API specifies the distance that shadows will be
  /// offset
  /// horizontally.
  ///
  /// > **Note:** Shadows are only drawn if the
  /// > [CanvasRenderingContext2D.shadowColor] property is set to
  /// > a non-transparent value. One of the
  /// > [CanvasRenderingContext2D.shadowBlur], `shadowOffsetX`, or
  /// > [CanvasRenderingContext2D.shadowOffsetY] properties must
  /// > be non-zero, as well.
  external double get shadowOffsetX;
  external set shadowOffsetX(num value);

  /// The
  /// **`CanvasRenderingContext2D.shadowOffsetY`**
  /// property of the Canvas 2D API specifies the distance that shadows will be
  /// offset
  /// vertically.
  ///
  /// > **Note:** Shadows are only drawn if the
  /// > [CanvasRenderingContext2D.shadowColor] property is set to
  /// > a non-transparent value. One of the
  /// > [CanvasRenderingContext2D.shadowBlur],
  /// > [CanvasRenderingContext2D.shadowOffsetX], or `shadowOffsetY` properties
  /// > must be non-zero, as
  /// > well.
  external double get shadowOffsetY;
  external set shadowOffsetY(num value);

  /// The
  /// **`CanvasRenderingContext2D.shadowBlur`**
  /// property of the Canvas 2D API specifies the amount of blur applied to
  /// shadows. The
  /// default is `0` (no blur).
  ///
  /// > **Note:** Shadows are only drawn if the
  /// > [CanvasRenderingContext2D.shadowColor] property is set to
  /// > a non-transparent value. One of the `shadowBlur`,
  /// > [CanvasRenderingContext2D.shadowOffsetX], or
  /// > [CanvasRenderingContext2D.shadowOffsetY] properties must
  /// > be non-zero, as well.
  external double get shadowBlur;
  external set shadowBlur(num value);

  /// The
  /// **`CanvasRenderingContext2D.shadowColor`**
  /// property of the Canvas 2D API specifies the color of shadows.
  ///
  /// Be aware that the shadow's rendered opacity will be affected by the
  /// opacity of the
  /// [CanvasRenderingContext2D.fillStyle] color when filling, and
  /// of the [CanvasRenderingContext2D.strokeStyle] color when
  /// stroking.
  ///
  /// > **Note:** Shadows are only drawn if the `shadowColor`
  /// > property is set to a non-transparent value. One of the
  /// > [CanvasRenderingContext2D.shadowBlur],
  /// > [CanvasRenderingContext2D.shadowOffsetX], or
  /// > [CanvasRenderingContext2D.shadowOffsetY] properties must
  /// > be non-zero, as well.
  external String get shadowColor;
  external set shadowColor(String value);

  /// The
  /// **`CanvasRenderingContext2D.filter`**
  /// property of the Canvas 2D API provides filter effects such as blurring and
  /// grayscaling.
  /// It is similar to the CSS `filter` property and accepts the same values.
  external String get filter;
  external set filter(String value);

  /// The
  /// **`CanvasRenderingContext2D.lineWidth`**
  /// property of the Canvas 2D API sets the thickness of lines.
  ///
  /// > **Note:** Lines can be drawn with the
  /// > [CanvasRenderingContext2D.stroke],
  /// > [CanvasRenderingContext2D.strokeRect],
  /// > and [CanvasRenderingContext2D.strokeText] methods.
  external double get lineWidth;
  external set lineWidth(num value);

  /// The
  /// **`CanvasRenderingContext2D.lineCap`**
  /// property of the Canvas 2D API determines the shape used to draw the end
  /// points of lines.
  ///
  /// > **Note:** Lines can be drawn with the
  /// > [CanvasRenderingContext2D.stroke],
  /// > [CanvasRenderingContext2D.strokeRect],
  /// > and [CanvasRenderingContext2D.strokeText] methods.
  external CanvasLineCap get lineCap;
  external set lineCap(CanvasLineCap value);

  /// The
  /// **`CanvasRenderingContext2D.lineJoin`**
  /// property of the Canvas 2D API determines the shape used to join two line
  /// segments where
  /// they meet.
  ///
  /// This property has no effect wherever two connected segments have the same
  /// direction,
  /// because no joining area will be added in this case. Degenerate segments
  /// with a length of
  /// zero (i.e., with all endpoints and control points at the exact same
  /// position) are also
  /// ignored.
  ///
  /// > **Note:** Lines can be drawn with the
  /// > [CanvasRenderingContext2D.stroke],
  /// > [CanvasRenderingContext2D.strokeRect],
  /// > and [CanvasRenderingContext2D.strokeText] methods.
  external CanvasLineJoin get lineJoin;
  external set lineJoin(CanvasLineJoin value);

  /// The **`CanvasRenderingContext2D.miterLimit`** property of the
  /// Canvas 2D API sets the miter limit ratio.
  ///
  /// > **Note:** For more info about miters, see
  /// > [Applying styles and color](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial/Applying_styles_and_colors)
  /// > in the
  /// > [Canvas tutorial](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial).
  external double get miterLimit;
  external set miterLimit(num value);

  /// The
  /// **`CanvasRenderingContext2D.lineDashOffset`**
  /// property of the Canvas 2D API sets the line dash offset, or "phase."
  ///
  /// > **Note:** Lines are drawn by calling the
  /// > [CanvasRenderingContext2D.stroke] method.
  external double get lineDashOffset;
  external set lineDashOffset(num value);

  /// The **`CanvasRenderingContext2D.font`** property of the Canvas 2D API
  /// specifies the current text style to use when drawing text.
  /// This string uses the same syntax as the
  /// [CSS font](https://developer.mozilla.org/en-US/docs/Web/CSS/font)
  /// specifier.
  external String get font;
  external set font(String value);

  /// The
  /// **`CanvasRenderingContext2D.textAlign`**
  /// property of the Canvas 2D API specifies the current text alignment used
  /// when drawing
  /// text.
  ///
  /// The alignment is relative to the `x` value of the
  /// [CanvasRenderingContext2D.fillText] method. For example, if
  /// `textAlign` is `"center"`, then the text's left edge will be at
  /// `x - (textWidth / 2)`.
  external CanvasTextAlign get textAlign;
  external set textAlign(CanvasTextAlign value);

  /// The
  /// **`CanvasRenderingContext2D.textBaseline`**
  /// property of the Canvas 2D API specifies the current text baseline used
  /// when drawing
  /// text.
  external CanvasTextBaseline get textBaseline;
  external set textBaseline(CanvasTextBaseline value);

  /// The
  /// **`CanvasRenderingContext2D.direction`**
  /// property of the Canvas 2D API specifies the current text direction used to
  /// draw text.
  external CanvasDirection get direction;
  external set direction(CanvasDirection value);

  /// The **`CanvasRenderingContext2D.letterSpacing`** property of the
  /// [Canvas API](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API)
  /// specifies the spacing between letters when drawing text.
  ///
  /// This corresponds to the CSS
  /// [`letter-spacing`](https://developer.mozilla.org/en-US/docs/Web/CSS/letter-spacing)
  /// property.
  external String get letterSpacing;
  external set letterSpacing(String value);

  /// The **`CanvasRenderingContext2D.fontKerning`** property of the
  /// [Canvas API](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API)
  /// specifies how font kerning information is used.
  ///
  /// Kerning adjusts how adjacent letters are spaced in a proportional font,
  /// allowing them to edge into each other's visual area if there is space
  /// available.
  /// For example, in well-kerned fonts, the characters `AV`, `Ta` and `We` nest
  /// together and make character spacing more uniform and pleasant to read than
  /// the equivalent text without kerning.
  ///
  /// The property corresponds to the
  /// [`font-kerning`](https://developer.mozilla.org/en-US/docs/Web/CSS/font-kerning)
  /// CSS property.
  external CanvasFontKerning get fontKerning;
  external set fontKerning(CanvasFontKerning value);

  /// The **`CanvasRenderingContext2D.fontStretch`** property of the
  /// [Canvas API](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API)
  /// specifies how the font may be expanded or condensed when drawing text.
  ///
  /// The property corresponds to the
  /// [`font-stretch`](https://developer.mozilla.org/en-US/docs/Web/CSS/font-stretch)
  /// CSS property when used with keywords (percentage values are not
  /// supported).
  external CanvasFontStretch get fontStretch;
  external set fontStretch(CanvasFontStretch value);

  /// The **`CanvasRenderingContext2D.fontVariantCaps`** property of the
  /// [Canvas API](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API)
  /// specifies an alternative capitalization of the rendered text.
  ///
  /// This corresponds to the CSS
  /// [`font-variant-caps`](https://developer.mozilla.org/en-US/docs/Web/CSS/font-variant-caps)
  /// property.
  external CanvasFontVariantCaps get fontVariantCaps;
  external set fontVariantCaps(CanvasFontVariantCaps value);

  /// The **`CanvasRenderingContext2D.textRendering`** property of the
  /// [Canvas API](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API)
  /// provides information to the rendering engine about what to optimize for
  /// when rendering text.
  ///
  /// The values correspond to the SVG
  /// [`text-rendering`](https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/text-rendering)
  /// attribute (and CSS
  /// [`text-rendering`](https://developer.mozilla.org/en-US/docs/Web/CSS/text-rendering)
  /// property).
  external CanvasTextRendering get textRendering;
  external set textRendering(CanvasTextRendering value);

  /// The **`CanvasRenderingContext2D.wordSpacing`** property of the
  /// [Canvas API](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API)
  /// specifies the spacing between words when drawing text.
  ///
  /// This corresponds to the CSS
  /// [`word-spacing`](https://developer.mozilla.org/en-US/docs/Web/CSS/word-spacing)
  /// property.
  external String get wordSpacing;
  external set wordSpacing(String value);
}

/// The **`CanvasGradient`** interface represents an
/// [opaque object](https://en.wikipedia.org/wiki/Opaque_data_type) describing a
/// gradient. It is returned by the methods
/// [CanvasRenderingContext2D.createLinearGradient],
/// [CanvasRenderingContext2D.createConicGradient] or
/// [CanvasRenderingContext2D.createRadialGradient].
///
/// It can be used as a [CanvasRenderingContext2D.fillStyle] or
/// [CanvasRenderingContext2D.strokeStyle].
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/CanvasGradient).
extension type CanvasGradient._(JSObject _) implements JSObject {
  /// The **`CanvasGradient.addColorStop()`** method adds a new color stop,
  /// defined by an `offset` and a `color`, to a given canvas gradient.
  external void addColorStop(
    num offset,
    String color,
  );
}

/// The **`CanvasPattern`** interface represents an
/// [opaque object](https://en.wikipedia.org/wiki/Opaque_data_type) describing a
/// pattern, based on an image, a canvas, or a video, created by the
/// [CanvasRenderingContext2D.createPattern] method.
///
/// It can be used as a [CanvasRenderingContext2D.fillStyle] or
/// [CanvasRenderingContext2D.strokeStyle].
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/CanvasPattern).
extension type CanvasPattern._(JSObject _) implements JSObject {
  /// The **`CanvasPattern.setTransform()`** method uses a [DOMMatrix] object as
  /// the pattern's transformation matrix and invokes it on the pattern.
  external void setTransform([DOMMatrix2DInit transform]);
}

/// The **`TextMetrics`** interface represents the dimensions of a piece of text
/// in the canvas; a `TextMetrics` instance can be retrieved using the
/// [CanvasRenderingContext2D.measureText] method.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/TextMetrics).
extension type TextMetrics._(JSObject _) implements JSObject {
  /// The read-only **`width`** property of the [TextMetrics] interface contains
  /// the text's advance width (the width of that inline box) in CSS pixels.
  external double get width;

  /// The read-only `actualBoundingBoxLeft` property of the [TextMetrics]
  /// interface is a `double` giving the distance parallel to the baseline from
  /// the alignment point given by the [CanvasRenderingContext2D.textAlign]
  /// property to the left side of the bounding rectangle of the given text, in
  /// CSS pixels; positive numbers indicating a distance going left from the
  /// given alignment point.
  external double get actualBoundingBoxLeft;

  /// The read-only `actualBoundingBoxRight` property of the [TextMetrics]
  /// interface is a `double` giving the distance parallel to the baseline from
  /// the alignment point given by the [CanvasRenderingContext2D.textAlign]
  /// property to the right side of the bounding rectangle of the given text, in
  /// CSS pixels.
  external double get actualBoundingBoxRight;

  /// The read-only `fontBoundingBoxAscent` property of the [TextMetrics]
  /// interface returns the distance from the horizontal line indicated by the
  /// [CanvasRenderingContext2D.textBaseline] attribute, to the top of the
  /// highest bounding rectangle of all the fonts used to render the text, in
  /// CSS pixels.
  external double get fontBoundingBoxAscent;

  /// The read-only `fontBoundingBoxDescent` property of the [TextMetrics]
  /// interface returns the distance from the horizontal line indicated by the
  /// [CanvasRenderingContext2D.textBaseline] attribute to the bottom of the
  /// bounding rectangle of all the fonts used to render the text, in CSS
  /// pixels.
  external double get fontBoundingBoxDescent;

  /// The read-only **`actualBoundingBoxAscent`** property of the [TextMetrics]
  /// interface is a `double` giving the distance from the horizontal line
  /// indicated by the [CanvasRenderingContext2D.textBaseline] attribute to the
  /// top of the bounding rectangle used to render the text, in CSS pixels.
  external double get actualBoundingBoxAscent;

  /// The read-only `actualBoundingBoxDescent` property of the [TextMetrics]
  /// interface is a `double` giving the distance from the horizontal line
  /// indicated by the [CanvasRenderingContext2D.textBaseline] attribute to the
  /// bottom of the bounding rectangle used to render the text, in CSS pixels.
  external double get actualBoundingBoxDescent;

  /// The read-only `emHeightAscent` property of the [TextMetrics] interface
  /// returns the distance from the horizontal line indicated by the
  /// [CanvasRenderingContext2D.textBaseline] property to the top of the _em_
  /// square in the line box, in CSS pixels.
  external double get emHeightAscent;

  /// The read-only `emHeightDescent` property of the [TextMetrics] interface
  /// returns the distance from the horizontal line indicated by the
  /// [CanvasRenderingContext2D.textBaseline] property to the bottom of the _em_
  /// square in the line box, in CSS pixels.
  external double get emHeightDescent;

  /// The read-only `hangingBaseline` property of the [TextMetrics] interface is
  /// a `double` giving the distance from the horizontal line indicated by the
  /// [CanvasRenderingContext2D.textBaseline] property to the hanging baseline
  /// of the line box, in CSS pixels.
  external double get hangingBaseline;

  /// The read-only `alphabeticBaseline` property of the [TextMetrics] interface
  /// is a `double` giving the distance from the horizontal line indicated by
  /// the [CanvasRenderingContext2D.textBaseline] property to the alphabetic
  /// baseline of the line box, in CSS pixels.
  external double get alphabeticBaseline;

  /// The read-only `ideographicBaseline` property of the [TextMetrics]
  /// interface is a `double` giving the distance from the horizontal line
  /// indicated by the [CanvasRenderingContext2D.textBaseline] property to the
  /// ideographic baseline of the line box, in CSS pixels.
  external double get ideographicBaseline;
}
extension type ImageDataSettings._(JSObject _) implements JSObject {
  external factory ImageDataSettings({PredefinedColorSpace colorSpace});

  external PredefinedColorSpace get colorSpace;
  external set colorSpace(PredefinedColorSpace value);
}

/// The **`ImageData`** interface represents the underlying pixel data of an
/// area of a `canvas` element.
///
/// It is created using the [ImageData.ImageData] constructor or creator methods
/// on the [CanvasRenderingContext2D] object associated with a canvas:
/// [CanvasRenderingContext2D.createImageData] and
/// [CanvasRenderingContext2D.getImageData]. It can also be used to set a part
/// of the canvas by using [CanvasRenderingContext2D.putImageData].
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/ImageData).
extension type ImageData._(JSObject _) implements JSObject {
  external factory ImageData(
    JSAny dataOrSw,
    int shOrSw, [
    JSAny settingsOrSh,
    ImageDataSettings settings,
  ]);

  /// The readonly **`ImageData.width`** property returns the number
  /// of pixels per row in the [ImageData] object.
  external int get width;

  /// The readonly **`ImageData.height`** property returns the number
  /// of rows in the [ImageData] object.
  external int get height;

  /// The readonly **`ImageData.data`** property returns a
  /// `Uint8ClampedArray` that contains the [ImageData] object's
  /// pixel data. Data is stored as a one-dimensional array in the RGBA order,
  /// with integer
  /// values between `0` and `255` (inclusive).
  external JSUint8ClampedArray get data;

  /// The read-only **`ImageData.colorSpace`** property is a string indicating
  /// the color space of the image data.
  ///
  /// The color space can be set during `ImageData` initialization using either
  /// the
  /// [`ImageData()`](https://developer.mozilla.org/en-US/docs/Web/API/ImageData/ImageData)
  /// constructor or the
  /// [`createImageData()`](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/createImageData)
  /// method.
  external PredefinedColorSpace get colorSpace;
}

/// The **`Path2D`** interface of the Canvas 2D API is used to declare a path
/// that can then be used on a [CanvasRenderingContext2D] object. The
/// [path methods](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D#paths)
/// of the `CanvasRenderingContext2D` interface are also present on this
/// interface, which gives you the convenience of being able to retain and
/// replay your path whenever desired.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/Path2D).
extension type Path2D._(JSObject _) implements JSObject {
  external factory Path2D([JSAny path]);

  /// The **`Path2D.addPath()`** method
  /// of the Canvas 2D API adds one [Path2D] object to another
  /// `Path2D` object.
  external void addPath(
    Path2D path, [
    DOMMatrix2DInit transform,
  ]);
  external void closePath();
  external void moveTo(
    num x,
    num y,
  );
  external void lineTo(
    num x,
    num y,
  );
  external void quadraticCurveTo(
    num cpx,
    num cpy,
    num x,
    num y,
  );
  external void bezierCurveTo(
    num cp1x,
    num cp1y,
    num cp2x,
    num cp2y,
    num x,
    num y,
  );
  external void arcTo(
    num x1,
    num y1,
    num x2,
    num y2,
    num radius,
  );
  external void rect(
    num x,
    num y,
    num w,
    num h,
  );
  external void roundRect(
    num x,
    num y,
    num w,
    num h, [
    JSAny radii,
  ]);
  external void arc(
    num x,
    num y,
    num radius,
    num startAngle,
    num endAngle, [
    bool counterclockwise,
  ]);
  external void ellipse(
    num x,
    num y,
    num radiusX,
    num radiusY,
    num rotation,
    num startAngle,
    num endAngle, [
    bool counterclockwise,
  ]);
}

/// The **`ImageBitmapRenderingContext`** interface is a canvas rendering
/// context that provides the functionality to replace the canvas's contents
/// with the given [ImageBitmap]. Its context id (the first argument to
/// [HTMLCanvasElement.getContext] or [OffscreenCanvas.getContext]) is
/// `"bitmaprenderer"`.
///
/// This interface is available in both the window and the
/// [worker](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API)
/// context.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/ImageBitmapRenderingContext).
extension type ImageBitmapRenderingContext._(JSObject _) implements JSObject {
  /// The **`ImageBitmapRenderingContext.transferFromImageBitmap()`**
  /// method displays the given [ImageBitmap] in the canvas associated with this
  /// rendering context. The ownership of the `ImageBitmap` is transferred to
  /// the
  /// canvas as well.
  ///
  /// This method was previously named `transferImageBitmap()`, but was renamed
  /// in
  /// a spec change. The old name is being kept as an alias to avoid code
  /// breakage.
  external void transferFromImageBitmap(ImageBitmap? bitmap);
  external JSObject get canvas;
}
extension type ImageEncodeOptions._(JSObject _) implements JSObject {
  external factory ImageEncodeOptions({
    String type,
    num quality,
  });

  external String get type;
  external set type(String value);
  external double get quality;
  external set quality(num value);
}

/// When using the `canvas` element or the
/// [Canvas API](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API),
/// rendering, animation, and user interaction usually happen on the main
/// execution thread of a web application.
/// The computation relating to canvas animations and rendering can have a
/// significant impact on application performance.
///
/// The **`OffscreenCanvas`** interface provides a canvas that can be rendered
/// off screen, decoupling the DOM and the Canvas API so that the `canvas`
/// element is no longer entirely dependent on the DOM.
/// Rendering operations can also be run inside a
/// [worker](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API)
/// context, allowing you to run some tasks in a separate thread and avoid heavy
/// work on the main thread.
///
/// `OffscreenCanvas` is a
/// [transferable object](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Transferable_objects).
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/OffscreenCanvas).
extension type OffscreenCanvas._(JSObject _) implements EventTarget, JSObject {
  external factory OffscreenCanvas(
    int width,
    int height,
  );

  /// The **`OffscreenCanvas.getContext()`** method returns a drawing context
  /// for an offscreen canvas, or
  /// [`null`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/null)
  /// if the context identifier is not supported.
  external OffscreenRenderingContext? getContext(
    OffscreenRenderingContextId contextId, [
    JSAny? options,
  ]);

  /// The **`OffscreenCanvas.transferToImageBitmap()`** method creates an
  /// [ImageBitmap] object from the most recently rendered image of the
  /// `OffscreenCanvas`. The `OffscreenCanvas` allocates a new image for its
  /// subsequent rendering.
  external ImageBitmap transferToImageBitmap();

  /// The **`OffscreenCanvas.convertToBlob()`** method creates a [Blob] object
  /// representing the image contained in the canvas.
  ///
  /// The desired file format and image quality may be specified.
  /// If the file format is not specified, or if the given format is not
  /// supported, then the data will be exported as `image/png`.
  /// Browsers are required to support `image/png`; many will support additional
  /// formats including `image/jpeg` and `image/webp`.
  ///
  /// The created image will have a resolution of 96dpi for file formats that
  /// support encoding resolution metadata.
  external JSPromise<Blob> convertToBlob([ImageEncodeOptions options]);

  /// The **`width`** property returns and sets the width of an
  /// [OffscreenCanvas] object.
  external int get width;
  external set width(int value);

  /// The **`height`** property returns and sets the height of an
  /// [OffscreenCanvas] object.
  external int get height;
  external set height(int value);
  external EventHandler get oncontextlost;
  external set oncontextlost(EventHandler value);
  external EventHandler get oncontextrestored;
  external set oncontextrestored(EventHandler value);
}

/// The **`OffscreenCanvasRenderingContext2D`** interface is a
/// [CanvasRenderingContext2D] rendering context for drawing to the bitmap of an
/// `OffscreenCanvas` object.
/// It is similar to the `CanvasRenderingContext2D` object, with the following
/// differences:
///
/// - there is no support for user-interface features (`drawFocusIfNeeded`, and
///   `scrollPathIntoView`)
/// - its `canvas` attribute refers to an `OffscreenCanvas` object rather than a
///   `canvas` element
/// - the bitmap for the placeholder `canvas` element belonging to the
///   `OffscreenCanvas` object is updated during the rendering update of the
///   `Window` or `Worker` that owns the `OffscreenCanvas`
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/OffscreenCanvasRenderingContext2D).
extension type OffscreenCanvasRenderingContext2D._(JSObject _)
    implements JSObject {
  external void save();
  external void restore();
  external void reset();
  external bool isContextLost();
  external void scale(
    num x,
    num y,
  );
  external void rotate(num angle);
  external void translate(
    num x,
    num y,
  );
  external void transform(
    num a,
    num b,
    num c,
    num d,
    num e,
    num f,
  );
  external DOMMatrix getTransform();
  external void setTransform([
    JSAny aOrTransform,
    num b,
    num c,
    num d,
    num e,
    num f,
  ]);
  external void resetTransform();
  external CanvasGradient createLinearGradient(
    num x0,
    num y0,
    num x1,
    num y1,
  );
  external CanvasGradient createRadialGradient(
    num x0,
    num y0,
    num r0,
    num x1,
    num y1,
    num r1,
  );
  external CanvasGradient createConicGradient(
    num startAngle,
    num x,
    num y,
  );
  external CanvasPattern? createPattern(
    CanvasImageSource image,
    String repetition,
  );
  external void clearRect(
    num x,
    num y,
    num w,
    num h,
  );
  external void fillRect(
    num x,
    num y,
    num w,
    num h,
  );
  external void strokeRect(
    num x,
    num y,
    num w,
    num h,
  );
  external void beginPath();
  external void fill([
    JSAny fillRuleOrPath,
    CanvasFillRule fillRule,
  ]);
  external void stroke([Path2D path]);
  external void clip([
    JSAny fillRuleOrPath,
    CanvasFillRule fillRule,
  ]);
  external bool isPointInPath(
    JSAny pathOrX,
    num xOrY, [
    JSAny fillRuleOrY,
    CanvasFillRule fillRule,
  ]);
  external bool isPointInStroke(
    JSAny pathOrX,
    num xOrY, [
    num y,
  ]);
  external void fillText(
    String text,
    num x,
    num y, [
    num maxWidth,
  ]);
  external void strokeText(
    String text,
    num x,
    num y, [
    num maxWidth,
  ]);
  external TextMetrics measureText(String text);
  external void drawImage(
    CanvasImageSource image,
    num dxOrSx,
    num dyOrSy, [
    num dwOrSw,
    num dhOrSh,
    num dx,
    num dy,
    num dw,
    num dh,
  ]);
  external ImageData createImageData(
    JSAny imagedataOrSw, [
    int sh,
    ImageDataSettings settings,
  ]);
  external ImageData getImageData(
    int sx,
    int sy,
    int sw,
    int sh, [
    ImageDataSettings settings,
  ]);
  external void putImageData(
    ImageData imagedata,
    int dx,
    int dy, [
    int dirtyX,
    int dirtyY,
    int dirtyWidth,
    int dirtyHeight,
  ]);
  external void setLineDash(JSArray<JSNumber> segments);
  external JSArray<JSNumber> getLineDash();
  external void closePath();
  external void moveTo(
    num x,
    num y,
  );
  external void lineTo(
    num x,
    num y,
  );
  external void quadraticCurveTo(
    num cpx,
    num cpy,
    num x,
    num y,
  );
  external void bezierCurveTo(
    num cp1x,
    num cp1y,
    num cp2x,
    num cp2y,
    num x,
    num y,
  );
  external void arcTo(
    num x1,
    num y1,
    num x2,
    num y2,
    num radius,
  );
  external void rect(
    num x,
    num y,
    num w,
    num h,
  );
  external void roundRect(
    num x,
    num y,
    num w,
    num h, [
    JSAny radii,
  ]);
  external void arc(
    num x,
    num y,
    num radius,
    num startAngle,
    num endAngle, [
    bool counterclockwise,
  ]);
  external void ellipse(
    num x,
    num y,
    num radiusX,
    num radiusY,
    num rotation,
    num startAngle,
    num endAngle, [
    bool counterclockwise,
  ]);
  external OffscreenCanvas get canvas;
  external double get globalAlpha;
  external set globalAlpha(num value);
  external String get globalCompositeOperation;
  external set globalCompositeOperation(String value);
  external bool get imageSmoothingEnabled;
  external set imageSmoothingEnabled(bool value);
  external ImageSmoothingQuality get imageSmoothingQuality;
  external set imageSmoothingQuality(ImageSmoothingQuality value);
  external JSAny get strokeStyle;
  external set strokeStyle(JSAny value);
  external JSAny get fillStyle;
  external set fillStyle(JSAny value);
  external double get shadowOffsetX;
  external set shadowOffsetX(num value);
  external double get shadowOffsetY;
  external set shadowOffsetY(num value);
  external double get shadowBlur;
  external set shadowBlur(num value);
  external String get shadowColor;
  external set shadowColor(String value);
  external String get filter;
  external set filter(String value);
  external double get lineWidth;
  external set lineWidth(num value);
  external CanvasLineCap get lineCap;
  external set lineCap(CanvasLineCap value);
  external CanvasLineJoin get lineJoin;
  external set lineJoin(CanvasLineJoin value);
  external double get miterLimit;
  external set miterLimit(num value);
  external double get lineDashOffset;
  external set lineDashOffset(num value);
  external String get font;
  external set font(String value);
  external CanvasTextAlign get textAlign;
  external set textAlign(CanvasTextAlign value);
  external CanvasTextBaseline get textBaseline;
  external set textBaseline(CanvasTextBaseline value);
  external CanvasDirection get direction;
  external set direction(CanvasDirection value);
  external String get letterSpacing;
  external set letterSpacing(String value);
  external CanvasFontKerning get fontKerning;
  external set fontKerning(CanvasFontKerning value);
  external CanvasFontStretch get fontStretch;
  external set fontStretch(CanvasFontStretch value);
  external CanvasFontVariantCaps get fontVariantCaps;
  external set fontVariantCaps(CanvasFontVariantCaps value);
  external CanvasTextRendering get textRendering;
  external set textRendering(CanvasTextRendering value);
  external String get wordSpacing;
  external set wordSpacing(String value);
}

/// The **`CustomElementRegistry`** interface provides methods for registering
/// custom elements and querying registered elements. To get an instance of it,
/// use the [window.customElements] property.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/CustomElementRegistry).
extension type CustomElementRegistry._(JSObject _) implements JSObject {
  /// The **`define()`** method of the [CustomElementRegistry] interface adds a
  /// definition for a custom element to the custom element registry, mapping
  /// its name to the constructor which will be used to create it.
  external void define(
    String name,
    CustomElementConstructor constructor, [
    ElementDefinitionOptions options,
  ]);

  /// The **`get()`** method of the
  /// [CustomElementRegistry] interface returns the constructor for a
  /// previously-defined custom element.
  external CustomElementConstructor? get(String name);

  /// The **`getName()`** method of the
  /// [CustomElementRegistry] interface returns the name for a
  /// previously-defined custom element.
  external String? getName(CustomElementConstructor constructor);

  /// The **`whenDefined()`** method of the
  /// [CustomElementRegistry] interface returns a `Promise` that
  /// resolves when the named element is defined.
  external JSPromise<CustomElementConstructor> whenDefined(String name);

  /// The **`upgrade()`** method of the
  /// [CustomElementRegistry] interface upgrades all shadow-containing custom
  /// elements in a [Node] subtree, even before they are connected to the main
  /// document.
  external void upgrade(Node root);
}
extension type ElementDefinitionOptions._(JSObject _) implements JSObject {
  external factory ElementDefinitionOptions({String extends_});

  @JS('extends')
  external String get extends_;
  @JS('extends')
  external set extends_(String value);
}

/// The **`ElementInternals`** interface of the
/// [Document Object Model](https://developer.mozilla.org/en-US/docs/Web/API/Document_Object_Model)
/// gives web developers a way to allow custom elements to fully participate in
/// HTML forms. It provides utilities for working with these elements in the
/// same way you would work with any standard HTML form element, and also
/// exposes the
/// [Accessibility Object Model](https://wicg.github.io/aom/explainer.html) to
/// the element.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/ElementInternals).
extension type ElementInternals._(JSObject _) implements JSObject {
  /// The **`setFormValue()`** method of the [ElementInternals] interface sets
  /// the element's submission value and state, communicating these to the user
  /// agent.
  external void setFormValue(
    JSAny? value, [
    JSAny? state,
  ]);

  /// The **`setValidity()`** method of the [ElementInternals] interface sets
  /// the validity of the element.
  external void setValidity([
    ValidityStateFlags flags,
    String message,
    HTMLElement anchor,
  ]);

  /// The **`checkValidity()`** method of the [ElementInternals] interface
  /// checks if the element meets any
  /// [constraint validation](https://developer.mozilla.org/en-US/docs/Web/HTML/Constraint_validation)
  /// rules applied to it.
  ///
  /// If `checkValidity` returns `false` then a cancelable
  /// [invalid event](https://developer.mozilla.org/en-US/docs/Web/API/HTMLInputElement/invalid_event)
  /// is fired on the element.
  external bool checkValidity();

  /// The **`reportValidity()`** method of the [ElementInternals] interface
  /// checks if the element meets any
  /// [constraint validation](https://developer.mozilla.org/en-US/docs/Web/HTML/Constraint_validation)
  /// rules applied to it.
  ///
  /// If `reportValidity` returns `false` then a cancelable
  /// [invalid event](https://developer.mozilla.org/en-US/docs/Web/API/HTMLInputElement/invalid_event)
  /// is fired on the element.
  ///
  /// This method behaves in a similar way to [ElementInternals.checkValidity],
  /// however it additionally sends the value of
  /// [ElementInternals.validationMessage] to the user agent for display.
  external bool reportValidity();

  /// The **`shadowRoot`** read-only property of the [ElementInternals]
  /// interface returns the [ShadowRoot] for this element.
  external ShadowRoot? get shadowRoot;

  /// The **`form`** read-only property of the [ElementInternals] interface
  /// returns the [HTMLFormElement] associated with this element.
  external HTMLFormElement? get form;

  /// The **`willValidate`** read-only property of the [ElementInternals]
  /// interface returns `true` if the element is a submittable element that is a
  /// candidate for
  /// [constraint validation](https://developer.mozilla.org/en-US/docs/Web/HTML/Constraint_validation).
  ///
  /// Elements that are barred from being candidates for constraint validation
  /// include those that have the attributes: `disabled`, `hidden` or
  /// `readonly`, input elements of `type=button` or `type=reset`, or any
  /// element that is a `datalist` element or has a `<datalist>` element
  /// ancestor.
  external bool get willValidate;

  /// The **`validity`** read-only property of the [ElementInternals] interface
  /// returns a [ValidityState] object which represents the different validity
  /// states the element can be in, with respect to constraint validation.
  external ValidityState get validity;

  /// The **`validationMessage`** read-only property of the [ElementInternals]
  /// interface returns the validation message for the element.
  external String get validationMessage;

  /// The **`labels`** read-only property of the [ElementInternals] interface
  /// returns the labels associated with the element.
  external NodeList get labels;

  /// The **`states`** read-only property of the [ElementInternals] interface
  /// returns a [CustomStateSet] representing the possible states of the custom
  /// element.
  external CustomStateSet get states;

  /// The **`role`** read-only property of the [ElementInternals] interface
  /// returns the
  /// [WAI-ARIA role](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Roles)
  /// for the element. For example, a checkbox might have
  /// [`role="checkbox"`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Roles/checkbox_role).
  external String? get role;
  external set role(String? value);

  /// The **`ariaAtomic`** property of the [ElementInternals] interface reflects
  /// the value of the
  /// [`aria-atomic`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-atomic)
  /// attribute, which indicates whether assistive technologies will present
  /// all, or only parts of, the changed region based on the change
  /// notifications defined by the `aria-relevant` attribute.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaAtomic;
  external set ariaAtomic(String? value);

  /// The **`ariaAutoComplete`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-autocomplete`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-autocomplete)
  /// attribute, which indicates whether inputting text could trigger display of
  /// one or more predictions of the user's intended value for a combobox,
  /// searchbox, or textbox and specifies how predictions would be presented if
  /// they were made.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaAutoComplete;
  external set ariaAutoComplete(String? value);
  external String? get ariaBrailleLabel;
  external set ariaBrailleLabel(String? value);
  external String? get ariaBrailleRoleDescription;
  external set ariaBrailleRoleDescription(String? value);

  /// The **`ariaBusy`** property of the [ElementInternals] interface reflects
  /// the value of the
  /// [`aria-busy`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-busy)
  /// attribute, which indicates whether an element is being modified, as
  /// assistive technologies may want to wait until the modifications are
  /// complete before exposing them to the user.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaBusy;
  external set ariaBusy(String? value);

  /// The **`ariaChecked`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-checked`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-checked)
  /// attribute, which indicates the current "checked" state of checkboxes,
  /// radio buttons, and other widgets that have a checked state.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaChecked;
  external set ariaChecked(String? value);

  /// The **`ariaColCount`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-colcount`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-colcount)
  /// attribute, which defines the number of columns in a table, grid, or
  /// treegrid.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaColCount;
  external set ariaColCount(String? value);

  /// The **`ariaColIndex`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-colindex`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-colindex)
  /// attribute, which defines an element's column index or position with
  /// respect to the total number of columns within a table, grid, or treegrid.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaColIndex;
  external set ariaColIndex(String? value);

  /// The **`ariaColSpan`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-colspan`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-colspan)
  /// attribute, which defines the number of columns spanned by a cell or
  /// gridcell within a table, grid, or treegrid.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaColSpan;
  external set ariaColSpan(String? value);

  /// The **`ariaCurrent`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-current`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-current)
  /// attribute, which indicates the element that represents the current item
  /// within a container or set of related elements.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaCurrent;
  external set ariaCurrent(String? value);

  /// The **`ariaDescription`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-description`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-description)
  /// attribute, which defines a string value that describes or annotates the
  /// current element.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaDescription;
  external set ariaDescription(String? value);

  /// The **`ariaDisabled`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-disabled`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-disabled)
  /// attribute, which indicates that the element is perceivable but disabled,
  /// so it is not editable or otherwise operable.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaDisabled;
  external set ariaDisabled(String? value);

  /// The **`ariaExpanded`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-expanded`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-expanded)
  /// attribute, which indicates whether a grouping element owned or controlled
  /// by this element is expanded or collapsed.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaExpanded;
  external set ariaExpanded(String? value);

  /// The **`ariaHasPopup`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-haspopup`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-haspopup)
  /// attribute, which indicates the availability and type of interactive popup
  /// element, such as menu or dialog, that can be triggered by an element.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaHasPopup;
  external set ariaHasPopup(String? value);

  /// The **`ariaHidden`** property of the [ElementInternals] interface reflects
  /// the value of the
  /// [`aria-hidden`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-hidden)
  /// attribute, which indicates whether the element is exposed to an
  /// accessibility API.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaHidden;
  external set ariaHidden(String? value);
  external String? get ariaInvalid;
  external set ariaInvalid(String? value);

  /// The **`ariaKeyShortcuts`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-keyshortcuts`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-keyshortcuts)
  /// attribute, which indicates keyboard shortcuts that an author has
  /// implemented to activate or give focus to an element.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaKeyShortcuts;
  external set ariaKeyShortcuts(String? value);

  /// }
  ///
  /// The **`ariaLabel`** property of the [ElementInternals] interface reflects
  /// the value of the
  /// [`aria-label`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-label)
  /// attribute, which defines a string value that labels the current Element.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaLabel;
  external set ariaLabel(String? value);

  /// The **`ariaLevel`** property of the [ElementInternals] interface reflects
  /// the value of the
  /// [`aria-level`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-level)
  /// attribute, which defines the hierarchical level of an element within a
  /// structure.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaLevel;
  external set ariaLevel(String? value);

  /// The **`ariaLive`** property of the [ElementInternals] interface reflects
  /// the value of the
  /// [`aria-live`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/ARIA_Live_Regions)
  /// attribute, which indicates that an element will be updated, and describes
  /// the types of updates the user agents, assistive technologies, and user can
  /// expect from the live region.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaLive;
  external set ariaLive(String? value);

  /// The **`ariaModal`** property of the [ElementInternals] interface reflects
  /// the value of the
  /// [`aria-modal`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-modal)
  /// attribute, which indicates whether an element is modal when displayed.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaModal;
  external set ariaModal(String? value);

  /// The **`ariaMultiLine`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-multiline`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-multiline)
  /// attribute, which indicates whether a text box accepts multiple lines of
  /// input or only a single line.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaMultiLine;
  external set ariaMultiLine(String? value);

  /// The **`ariaMultiSelectable`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-multiselectable`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-multiselectable)
  /// attribute, which indicates that the user may select more than one item
  /// from the current selectable descendants.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaMultiSelectable;
  external set ariaMultiSelectable(String? value);

  /// The **`ariaOrientation`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-orientation`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-orientation)
  /// attribute, which indicates whether the element's orientation is
  /// horizontal, vertical, or unknown/ambiguous.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaOrientation;
  external set ariaOrientation(String? value);

  /// The **`ariaPlaceholder`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-placeholder`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-placeholder)
  /// attribute, which defines a short hint intended to aid the user with data
  /// entry when the control has no value.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaPlaceholder;
  external set ariaPlaceholder(String? value);

  /// The **`ariaPosInSet`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-posinset`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-posinset)
  /// attribute, which defines an element's number or position in the current
  /// set of listitems or treeitems.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaPosInSet;
  external set ariaPosInSet(String? value);

  /// The **`ariaPressed`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-pressed`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-pressed)
  /// attribute, which indicates the current "pressed" state of toggle buttons.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaPressed;
  external set ariaPressed(String? value);

  /// The **`ariaReadOnly`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-readonly`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-readonly)
  /// attribute, which indicates that the element is not editable, but is
  /// otherwise operable.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaReadOnly;
  external set ariaReadOnly(String? value);

  /// The **`ariaRequired`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-required`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-required)
  /// attribute, which indicates that user input is required on the element
  /// before a form may be submitted.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaRequired;
  external set ariaRequired(String? value);

  /// The **`ariaRoleDescription`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-roledescription`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-roledescription)
  /// attribute, which defines a human-readable, author-localized description
  /// for the role of an element.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaRoleDescription;
  external set ariaRoleDescription(String? value);

  /// The **`ariaRowCount`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-rowcount`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-rowcount)
  /// attribute, which defines the total number of rows in a table, grid, or
  /// treegrid.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaRowCount;
  external set ariaRowCount(String? value);

  /// The **`ariaRowIndex`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-rowindex`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-rowindex)
  /// attribute, which defines an element's row index or position with respect
  /// to the total number of rows within a table, grid, or treegrid.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaRowIndex;
  external set ariaRowIndex(String? value);

  /// The **`ariaRowSpan`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-rowspan`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-rowspan)
  /// attribute, which defines the number of rows spanned by a cell or gridcell
  /// within a table, grid, or treegrid.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaRowSpan;
  external set ariaRowSpan(String? value);

  /// The **`ariaSelected`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-selected`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-selected)
  /// attribute, which indicates the current "selected" state of elements that
  /// have a selected state.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaSelected;
  external set ariaSelected(String? value);

  /// The **`ariaSetSize`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-setsize`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-setsize)
  /// attribute, which defines the number of items in the current set of
  /// listitems or treeitems.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaSetSize;
  external set ariaSetSize(String? value);

  /// The **`ariaSort`** property of the [ElementInternals] interface reflects
  /// the value of the
  /// [`aria-sort`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-sort)
  /// attribute, which indicates if items in a table or grid are sorted in
  /// ascending or descending order.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaSort;
  external set ariaSort(String? value);

  /// The **`ariaValueMax`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-valuemax`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-valuemax)
  /// attribute, which defines the maximum allowed value for a range widget.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaValueMax;
  external set ariaValueMax(String? value);

  /// The **`ariaValueMin`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-valuemin`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-valuemin)
  /// attribute, which defines the minimum allowed value for a range widget.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaValueMin;
  external set ariaValueMin(String? value);

  /// The **`ariaValueNow`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-valuenow`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-valuenow)
  /// attribute, which defines the current value for a range widget.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaValueNow;
  external set ariaValueNow(String? value);

  /// The **`ariaValueText`** property of the [ElementInternals] interface
  /// reflects the value of the
  /// [`aria-valuetext`](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-valuetext)
  /// attribute, which defines the human-readable text alternative of
  /// aria-valuenow for a range widget.
  ///
  /// > **Note:** Setting aria attributes on `ElementInternals` allows default
  /// > semantics to be defined on a custom element. These may be overwritten by
  /// > author-defined attributes, but ensure that default semantics are
  /// > retained should the author delete those attributes, or fail to add them
  /// > at all. For more information see the
  /// > [Accessibility Object Model explainer](https://wicg.github.io/aom/explainer.html#default-semantics-for-custom-elements-via-the-elementinternals-object).
  external String? get ariaValueText;
  external set ariaValueText(String? value);
}
extension type ValidityStateFlags._(JSObject _) implements JSObject {
  external factory ValidityStateFlags({
    bool valueMissing,
    bool typeMismatch,
    bool patternMismatch,
    bool tooLong,
    bool tooShort,
    bool rangeUnderflow,
    bool rangeOverflow,
    bool stepMismatch,
    bool badInput,
    bool customError,
  });

  external bool get valueMissing;
  external set valueMissing(bool value);
  external bool get typeMismatch;
  external set typeMismatch(bool value);
  external bool get patternMismatch;
  external set patternMismatch(bool value);
  external bool get tooLong;
  external set tooLong(bool value);
  external bool get tooShort;
  external set tooShort(bool value);
  external bool get rangeUnderflow;
  external set rangeUnderflow(bool value);
  external bool get rangeOverflow;
  external set rangeOverflow(bool value);
  external bool get stepMismatch;
  external set stepMismatch(bool value);
  external bool get badInput;
  external set badInput(bool value);
  external bool get customError;
  external set customError(bool value);
}

/// The **`CustomStateSet`** interface of the
/// [Document Object Model](https://developer.mozilla.org/en-US/docs/Web/API/Document_Object_Model)
/// stores a list of states for an
/// [autonomous custom element](https://developer.mozilla.org/en-US/docs/Web/API/Web_components/Using_custom_elements#types_of_custom_element),
/// and allows states to be added and removed from the set.
///
/// The interface can be used to expose the internal states of a custom element,
/// allowing them to be used in CSS selectors by code that uses the element.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/CustomStateSet).
extension type CustomStateSet._(JSObject _) implements JSObject {}

/// The **`UserActivation`** interface provides information about whether a user
/// is currently interacting with the page, or has completed an interaction
/// since page load.
///
/// This API is only available in the window context and not exposed to workers.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/UserActivation).
extension type UserActivation._(JSObject _) implements JSObject {
  /// The read-only **`hasBeenActive`** property of the [UserActivation]
  /// interface indicates whether the current window has .
  external bool get hasBeenActive;

  /// The read-only **`isActive`** property of the [UserActivation] interface
  /// indicates whether the current window has .
  external bool get isActive;
}

/// The **`ToggleEvent`** interface represents an event notifying the user when
/// a
/// [popover element](https://developer.mozilla.org/en-US/docs/Web/API/Popover_API)'s
/// state toggles between showing and hidden.
///
/// It is the event object for the `HTMLElement`
/// [HTMLElement.beforetoggle_event] and [HTMLElement.toggle_event] events,
/// which fire on popovers when they transition between showing and hidden
/// (before and after, respectively).
///
/// > **Note:** `ToggleEvent` is unrelated to the `HTMLDetailsElement`
/// > [HTMLDetailsElement.toggle_event] event, which fires on a `details`
/// > element when its `open`/`closed` state is toggled. Its event object is a
/// > generic [Event].
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/ToggleEvent).
extension type ToggleEvent._(JSObject _) implements Event, JSObject {
  external factory ToggleEvent(
    String type, [
    ToggleEventInit eventInitDict,
  ]);

  /// The **`oldState`** read-only property of the [ToggleEvent] interface is a
  /// string representing the state the element is transitioning from.
  external String get oldState;

  /// The **`newState`** read-only property of the [ToggleEvent] interface is a
  /// string representing the state the element is transitioning to.
  external String get newState;
}
extension type ToggleEventInit._(JSObject _) implements EventInit, JSObject {
  external factory ToggleEventInit({
    bool bubbles,
    bool cancelable,
    bool composed,
    String oldState,
    String newState,
  });

  external String get oldState;
  external set oldState(String value);
  external String get newState;
  external set newState(String value);
}
extension type FocusOptions._(JSObject _) implements JSObject {
  external factory FocusOptions({
    bool preventScroll,
    bool focusVisible,
  });

  external bool get preventScroll;
  external set preventScroll(bool value);
  external bool get focusVisible;
  external set focusVisible(bool value);
}

/// The **`DataTransfer`** object is used to hold the data that is being dragged
/// during a drag and drop operation. It may hold one or more data items, each
/// of one or more data types. For more information about drag and drop, see
/// [HTML Drag and Drop API](https://developer.mozilla.org/en-US/docs/Web/API/HTML_Drag_and_Drop_API).
///
/// This object is available from the [DragEvent.dataTransfer] property of all
/// [DragEvent].
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/DataTransfer).
extension type DataTransfer._(JSObject _) implements JSObject {
  external factory DataTransfer();

  /// When a drag occurs, a translucent image is generated from the drag target
  /// (the element
  /// the [HTMLElement.dragstart_event] event is fired at), and follows the
  /// mouse pointer during the
  /// drag. This image is created automatically, so you do not need to create it
  /// yourself.
  /// However, if a custom image is desired, the
  /// **`DataTransfer.setDragImage()`** method can be used to set the
  /// custom image to be used. The image will typically be an `img` element
  /// but it can also be a `canvas` or any other visible element.
  ///
  /// The method's `x` and `y` coordinates define how the image should
  /// appear relative to the mouse pointer. These coordinates define the offset
  /// into the image
  /// where the mouse cursor should be. For instance, to display the image so
  /// that the pointer
  /// is at its center, use values that are half the width and height of the
  /// image.
  ///
  /// This method must be called in the [HTMLElement.dragstart_event] event
  /// handler.
  external void setDragImage(
    Element image,
    int x,
    int y,
  );

  /// The **`DataTransfer.getData()`**
  /// method retrieves drag data (as a string) for the specified type.
  /// If the drag operation does not include data, this method returns an empty
  /// string.
  ///
  /// Example data types are `text/plain` and `text/uri-list`.
  external String getData(String format);

  /// The **`DataTransfer.setData()`** method sets the drag
  /// operation's [DataTransfer] to the specified data and type. If
  /// data for the given type does not exist, it is added at the end of the drag
  /// data store,
  /// such that the last item in the [DataTransfer.types] list will be
  /// the new type. If data for the given type already exists, the existing data
  /// is replaced
  /// in the same position. That is, the order of the
  /// [DataTransfer.types] list is not changed when replacing data of the
  /// same type.
  ///
  /// Example data types are `text/plain` and `text/uri-list`.
  external void setData(
    String format,
    String data,
  );

  /// The **`DataTransfer.clearData()`** method removes the drag
  /// operation's [DataTransfer] for the given type. If data for the
  /// given type does not exist, this method does nothing.
  ///
  /// If this method is called with no arguments or the format is an empty
  /// string, the data of all types will be removed.
  ///
  /// This method does _not_ remove files from the drag operation, so it's
  /// possible
  /// for there still to be an entry with the type `"Files"` left in the
  /// object's
  /// [DataTransfer.types] list if there are any files included in the drag.
  ///
  /// > **Note:** This method can only be used in the handler for the
  /// > [HTMLElement.dragstart_event] event,
  /// > because that's the only time the drag operation's data store is
  /// > writable.
  external void clearData([String format]);

  /// The **`DataTransfer.dropEffect`** property controls the
  /// feedback (typically visual) the user is given during a drag and drop
  /// operation. It will
  /// affect which cursor is displayed while dragging. For example, when the
  /// user hovers over
  /// a target drop element, the browser's cursor may indicate which type of
  /// operation will
  /// occur.
  ///
  /// When the [DataTransfer] object is created, `dropEffect` is set
  /// to a string value. On getting, it returns its current value. On setting,
  /// if the new
  /// value is one of the values listed below, then the property's current value
  /// will be set
  /// to the new value and other values will be ignored.
  ///
  /// For the [HTMLElement.dragenter_event] and [HTMLElement.dragover_event]
  /// events,
  /// `dropEffect` will be initialized based on what action the user is
  /// requesting.
  /// How this is determined is platform specific, but typically the user can
  /// press modifier
  /// keys such as the alt key to adjust the desired action. Within event
  /// handlers for
  /// [HTMLElement.dragenter_event] and [HTMLElement.dragover_event] events,
  /// `dropEffect` should
  /// be modified if a different action is desired than the action that the user
  /// is
  /// requesting.
  ///
  /// For the [HTMLElement.drop_event] and [HTMLElement.dragend_event] events,
  /// `dropEffect` will
  /// be set to the action that was desired, which will be the value
  /// `dropEffect`
  /// had after the last [HTMLElement.dragenter_event] or
  /// [HTMLElement.dragover_event] event. In a
  /// [HTMLElement.dragend_event] event, for instance, if the desired dropEffect
  /// is "move", then the
  /// data being dragged should be removed from the source.
  external String get dropEffect;
  external set dropEffect(String value);

  /// The **`DataTransfer.effectAllowed`** property specifies the
  /// effect that is allowed for a drag operation. The _copy_ operation is used
  /// to
  /// indicate that the data being dragged will be copied from its present
  /// location to the
  /// drop location. The _move_ operation is used to indicate that the data
  /// being
  /// dragged will be moved, and the _link_ operation is used to indicate that
  /// some
  /// form of relationship or connection will be created between the source and
  /// drop
  /// locations.
  ///
  /// This property should be set in the [HTMLElement.dragstart_event] event to
  /// set the desired drag
  /// effect for the drag source. Within the [HTMLElement.dragenter_event] and
  /// [HTMLElement.dragover_event]
  /// event handlers, this property will be set to whatever value was assigned
  /// during the
  /// [HTMLElement.dragstart_event] event, thus `effectAllowed` may be used to
  /// determine
  /// which effect is permitted.
  ///
  /// Assigning a value to `effectAllowed` in events other than
  /// [HTMLElement.dragstart_event] has no effect.
  external String get effectAllowed;
  external set effectAllowed(String value);

  /// The read-only `items` property of the [DataTransfer] interface is a
  /// [DataTransferItemList] of the [DataTransferItem] in a drag operation. The
  /// list includes one item for each item in the operation and if the operation
  /// had no items, the list is empty.
  external DataTransferItemList get items;

  /// The **`DataTransfer.types`** read-only property returns the available
  /// types
  /// that exist in the [DataTransfer.items].
  external JSArray<JSString> get types;

  /// The **`files`** read-only property of
  /// [`DataTransfer`](https://developer.mozilla.org/en-US/docs/Web/API/DataTransfer)
  /// objects is a [FileList] in the drag operation. If the operation includes
  /// no files, the list is empty.
  ///
  /// This feature can be used to drag files from a user's desktop to the
  /// browser.
  ///
  /// > **Note:** The `files` property of
  /// > [`DataTransfer`](https://developer.mozilla.org/en-US/docs/Web/API/DataTransfer)
  /// > objects can only be accessed from within the `drop` event. For all other
  /// > events, the `files` property will be empty — because its underlying data
  /// > store will be in a
  /// > [protected mode](https://html.spec.whatwg.org/multipage/dnd.html#the-drag-data-store).
  external FileList get files;
}

/// The **`DataTransferItemList`** object is a list of [DataTransferItem]
/// objects representing items being dragged. During a _drag operation_, each
/// [DragEvent] has a [DragEvent.dataTransfer] property and that property is a
/// `DataTransferItemList`.
///
/// The individual items can be accessed using the
/// [bracket notation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Property_accessors#bracket_notation)
/// `[]`.
///
/// This interface has no constructor.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/DataTransferItemList).
extension type DataTransferItemList._(JSObject _) implements JSObject {
  external DataTransferItem operator [](int index);

  /// The **`DataTransferItemList.add()`** method creates a new
  /// [DataTransferItem] using the specified data and adds it to the drag data
  /// list. The item may be a [File] or a string of a
  /// given type. If the item is successfully added to the list, the
  /// newly-created
  /// [DataTransferItem] object is returned.
  external DataTransferItem? add(
    JSAny data, [
    String type,
  ]);

  /// The **`DataTransferItemList.remove()`** method removes the
  /// [DataTransferItem] at the specified index from the list. If the index is
  /// less than zero or greater than one less than the length of the list, the
  /// list will not
  /// be changed.
  external void remove(int index);

  /// The [DataTransferItemList] method
  /// **`clear()`** removes all [DataTransferItem]
  /// objects from the drag data items list, leaving the list empty.
  ///
  /// The drag data store in which this list is kept is only writable while
  /// handling the
  /// [HTMLElement.dragstart_event] event. While handling
  /// [HTMLElement.drop_event], the drag data store is
  /// in read-only mode, and this method silently does nothing. No exception is
  /// thrown.
  external void clear();

  /// The read-only **`length`** property of the
  /// [DataTransferItemList] interface returns the number of items currently in
  /// the drag item list.
  external int get length;
}

/// The **`DataTransferItem`** object represents one drag data item. During a
/// _drag operation_, each [DragEvent] has a [DragEvent.dataTransfer] property
/// which contains a [DataTransferItemList] of drag data items. Each item in the
/// list is a `DataTransferItem` object.
///
/// This interface has no constructor.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/DataTransferItem).
extension type DataTransferItem._(JSObject _) implements JSObject {
  /// The **`DataTransferItem.getAsString()`** method invokes the given callback
  /// with the drag data item's string data as the argument if the item's
  /// [DataTransferItem.kind] is a _Plain unicode string_ (i.e. `kind` is
  /// `string`).
  external void getAsString(FunctionStringCallback? callback);

  /// If the item is a file, the **`DataTransferItem.getAsFile()`** method
  /// returns the drag data item's [File] object.
  /// If the item is not a file, this method returns `null`.
  external File? getAsFile();

  /// If the item described by the [DataTransferItem] is a file,
  /// `webkitGetAsEntry()` returns a [FileSystemFileEntry] or
  /// [FileSystemDirectoryEntry] representing it. If the item isn't a file,
  /// `null` is returned.
  ///
  /// > **Note:** This function is implemented as `webkitGetAsEntry()` in
  /// > non-WebKit browsers including Firefox at this time; it may be renamed to
  /// > `getAsEntry()` in the future, so you should code defensively, looking
  /// > for both.
  external FileSystemEntry? webkitGetAsEntry();

  /// The read-only **`DataTransferItem.kind`** property returns the kind–a
  /// string or a file–of the [DataTransferItem] object representing the _drag
  /// data item_.
  external String get kind;

  /// The read-only **`DataTransferItem.type`** property returns the type
  /// (format) of the [DataTransferItem] object representing the drag data item.
  /// The `type` is a Unicode string generally given by a MIME type, although a
  /// MIME type is not required.
  ///
  /// Some example types are: `text/plain` and `text/html`.
  external String get type;
}

/// The **`DragEvent`** interface is a [Event] that represents a drag and drop
/// interaction. The user initiates a drag by placing a pointer device (such as
/// a mouse) on the touch surface and then dragging the pointer to a new
/// location (such as another DOM element). Applications are free to interpret a
/// drag and drop interaction in an application-specific way.
///
/// This interface inherits properties from [MouseEvent] and [Event].
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/DragEvent).
extension type DragEvent._(JSObject _) implements MouseEvent, JSObject {
  external factory DragEvent(
    String type, [
    DragEventInit eventInitDict,
  ]);

  /// The **`DragEvent.dataTransfer`** read-only property holds the drag
  /// operation's data (as a [DataTransfer] object).
  external DataTransfer? get dataTransfer;
}
extension type DragEventInit._(JSObject _) implements MouseEventInit, JSObject {
  external factory DragEventInit({
    bool bubbles,
    bool cancelable,
    bool composed,
    Window? view,
    int detail,
    JSObject? sourceCapabilities,
    int which,
    bool ctrlKey,
    bool shiftKey,
    bool altKey,
    bool metaKey,
    bool modifierAltGraph,
    bool modifierCapsLock,
    bool modifierFn,
    bool modifierFnLock,
    bool modifierHyper,
    bool modifierNumLock,
    bool modifierScrollLock,
    bool modifierSuper,
    bool modifierSymbol,
    bool modifierSymbolLock,
    int screenX,
    int screenY,
    int clientX,
    int clientY,
    int button,
    int buttons,
    EventTarget? relatedTarget,
    num movementX,
    num movementY,
    DataTransfer? dataTransfer,
  });

  external DataTransfer? get dataTransfer;
  external set dataTransfer(DataTransfer? value);
}
@JS()
external Window get window;

/// The **`Window`** interface represents a window containing a  document; the
/// `document` property points to the
/// [DOM document](https://developer.mozilla.org/en-US/docs/Web/API/Document)
/// loaded in that window.
///
/// A window for a given document can be obtained using the
/// [document.defaultView] property.
///
/// A global variable, `window`, representing the window in which the script is
/// running, is exposed to JavaScript code.
///
/// The `Window` interface is home to a variety of functions, namespaces,
/// objects, and constructors which are not necessarily directly associated with
/// the concept of a user interface window. However, the `Window` interface is a
/// suitable place to include these items that need to be globally available.
/// Many of these are documented in the
/// [JavaScript Reference](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference)
/// and the
/// [DOM Reference](https://developer.mozilla.org/en-US/docs/Web/API/Document_Object_Model).
///
/// In a tabbed browser, each tab is represented by its own `Window` object; the
/// global `window` seen by JavaScript code running within a given tab always
/// represents the tab in which the code is running. That said, even in a tabbed
/// browser, some properties and methods still apply to the overall window that
/// contains the tab, such as [Window.resizeTo] and [Window.innerHeight].
/// Generally, anything that can't reasonably pertain to a tab pertains to the
/// window instead.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/Window).
extension type Window._(JSObject _) implements EventTarget, JSObject {
  /// The **`Window.close()`** method closes the current window, or
  /// the window on which it was called.
  ///
  /// This method can only be called on windows that were opened by a script
  /// using the
  /// [Window.open] method, or on top-level windows that have a single history
  /// entry. If the window doesn't match these requirements, an error
  /// similar to this one appears in the console:
  /// `Scripts may not close windows that were not opened by script.`
  ///
  /// Note also that `close()` has no effect when called on [Window]
  /// objects returned by
  /// [`HTMLIFrameElement.contentWindow`](https://developer.mozilla.org/en-US/docs/Web/API/HTMLIFrameElement/contentWindow).
  external void close();

  /// The **`window.stop()`** stops further resource loading in the current
  /// browsing context, equivalent to the stop button in the browser.
  ///
  /// Because of how scripts are executed, this method cannot interrupt its
  /// parent
  /// document's loading, but it will stop its images, new windows, and other
  /// still-loading
  /// objects.
  external void stop();

  /// Makes a request to bring the window to the front. It may fail due to user
  /// settings and the window isn't guaranteed to be frontmost before this
  /// method returns.
  external void focus();

  /// The **`Window.blur()`** method does nothing.
  ///
  /// > **Note:** Historically, this method was the programmatic equivalent of
  /// > the user shifting focus away
  /// > from the current window. This behavior was removed due to hostile sites
  /// > abusing this functionality.
  /// > In Firefox, you can enable the old behavior with the
  /// > `dom.disable_window_flip` preference.
  external void blur();

  /// The **`open()`** method of the
  /// [`Window`](https://developer.mozilla.org/en-US/docs/Web/API/Window)
  /// interface loads a specified resource into a new or existing browsing
  /// context (that is, a tab, a window, or an
  /// [iframe](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/iframe))
  /// under a specified name.
  external Window? open([
    String url,
    String target,
    String features,
  ]);
  external JSObject operator [](String name);

  /// `window.alert()` instructs the browser to display a dialog with an
  /// optional message, and to wait until the user dismisses the dialog.
  ///
  /// Under some conditions — for example, when the user switches tabs — the
  /// browser may not actually display a dialog, or may not wait for the user to
  /// dismiss the dialog.
  external void alert([String message]);

  /// `window.confirm()` instructs the browser to display a dialog with an
  /// optional message, and to wait until the user either confirms or cancels
  /// the dialog.
  ///
  /// Under some conditions — for example, when the user switches tabs — the
  /// browser may not actually display a dialog, or may not wait for the user to
  /// confirm or cancel the dialog.
  external bool confirm([String message]);

  /// `window.prompt()` instructs the browser to display a dialog with an
  /// optional message prompting the user to input some text, and to wait until
  /// the user either submits the text or cancels the dialog.
  ///
  /// Under some conditions — for example, when the user switches tabs — the
  /// browser may not actually display a dialog, or may not wait for the user to
  /// submit text or to cancel the dialog.
  external String? prompt([
    String message,
    String default_,
  ]);

  /// Opens the print dialog to print the current document.
  ///
  /// If the document is still loading when this function is called, then the
  /// document will finish loading before opening the print dialog.
  ///
  /// This method will block while the print dialog is open.
  external void print();

  /// The **`window.postMessage()`** method safely enables cross-origin
  /// communication between [Window] objects; _e.g.,_ between a page and a
  /// pop-up that it spawned, or between a page and an iframe embedded within
  /// it.
  ///
  /// Normally, scripts on different pages are allowed to access each other if
  /// and only if the pages they originate from share the same
  /// [origin](https://developer.mozilla.org/en-US/docs/Web/API/Location/origin)
  /// (also known as the
  /// "[same-origin policy](https://developer.mozilla.org/en-US/docs/Web/Security/Same-origin_policy)").
  /// `window.postMessage()` provides a controlled mechanism to securely
  /// circumvent this restriction (if used properly).
  ///
  /// Furthermore, an accessing script must have obtained the window object of
  /// the accessed document beforehand. This can occur through methods such as
  /// [`window.open()`](https://developer.mozilla.org/en-US/docs/Web/API/Window/open)
  /// for popups or
  /// [`iframe.contentWindow`](https://developer.mozilla.org/en-US/docs/Web/API/HTMLIFrameElement/contentWindow)
  /// for iframes.
  ///
  /// Broadly, one window may obtain a reference to another (_e.g.,_ via
  /// `targetWindow = window.opener`), and then dispatch a [MessageEvent] on it
  /// with `targetWindow.postMessage()`. The receiving window is then free to
  /// [handle this event](https://developer.mozilla.org/en-US/docs/Web/Events/Event_handlers)
  /// as needed. The arguments passed to `window.postMessage()` (_i.e.,_ the
  /// "message") are
  /// [exposed to the receiving window through the event object](#the_dispatched_event).
  external void postMessage(
    JSAny? message, [
    JSAny optionsOrTargetOrigin,
    JSArray<JSObject> transfer,
  ]);

  /// The [Window] interface's **`matchMedia()`** method
  /// returns a new [MediaQueryList] object that can then be used to determine
  /// if
  /// the [document] matches the
  /// [media query](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_media_queries/Using_media_queries)
  /// string,
  /// as well as to monitor the document to detect when it matches (or stops
  /// matching) that
  /// media query.
  external MediaQueryList matchMedia(String query);

  /// The **`moveTo()`** method of the [Window]
  /// interface moves the current window to the specified coordinates.
  ///
  /// > **Note:** This function moves the window to an absolute location. In
  /// > contrast, [window.moveBy] moves the window relative to its current
  /// > location.
  external void moveTo(
    int x,
    int y,
  );

  /// The **`moveBy()`** method of the [Window]
  /// interface moves the current window by a specified amount.
  ///
  /// > **Note:** This function moves the window relative to its current
  /// > location. In contrast, [window.moveTo] moves the window to an absolute
  /// > location.
  external void moveBy(
    int x,
    int y,
  );

  /// The **`Window.resizeTo()`** method dynamically resizes the
  /// window.
  external void resizeTo(
    int width,
    int height,
  );

  /// The **`Window.resizeBy()`** method resizes the current window
  /// by a specified amount.
  external void resizeBy(
    int x,
    int y,
  );

  /// The **`Window.scroll()`** method scrolls the window to a
  /// particular place in the document.
  external void scroll([
    JSAny optionsOrX,
    num y,
  ]);

  /// **`Window.scrollTo()`** scrolls to a particular set of
  /// coordinates in the document.
  external void scrollTo([
    JSAny optionsOrX,
    num y,
  ]);

  /// The **`Window.scrollBy()`** method scrolls the document in the
  /// window by the given amount.
  external void scrollBy([
    JSAny optionsOrX,
    num y,
  ]);

  /// The
  /// **`Window.getComputedStyle()`** method returns an object
  /// containing the values of all CSS properties of an element, after applying
  /// active
  /// stylesheets and resolving any basic computation those values may contain.
  ///
  /// Individual CSS property values are accessed through APIs provided by the
  /// object, or by
  /// indexing with CSS property names.
  external CSSStyleDeclaration getComputedStyle(
    Element elt, [
    String? pseudoElt,
  ]);

  /// The **`Window.captureEvents()`** method does nothing.
  ///
  /// > **Note:** This is an method long removed from the specification. It is
  /// > kept in browsers to prevent code breakage but does nothing.
  external void captureEvents();

  /// Releases the window from trapping events of a specific type.
  external void releaseEvents();

  /// The **`window.requestIdleCallback()`** method queues a function
  /// to be called during a browser's idle periods. This enables developers to
  /// perform
  /// background and low priority work on the main event loop, without impacting
  /// latency-critical events such as animation and input response. Functions
  /// are generally
  /// called in first-in-first-out order; however, callbacks which have a
  /// `timeout`
  /// specified may be called out-of-order if necessary in order to run them
  /// before the
  /// timeout elapses.
  ///
  /// You can call `requestIdleCallback()` within an idle callback function to
  /// schedule another callback to take place no sooner than the next pass
  /// through the event
  /// loop.
  ///
  /// > **Note:** A `timeout` option is strongly recommended for required work,
  /// > as otherwise it's possible multiple seconds will elapse before the
  /// > callback is fired.
  external int requestIdleCallback(
    IdleRequestCallback callback, [
    IdleRequestOptions options,
  ]);

  /// The **`window.cancelIdleCallback()`** method cancels a callback
  /// previously scheduled with [window.requestIdleCallback].
  external void cancelIdleCallback(int handle);

  /// The **`Window.getSelection()`** method returns a
  /// [Selection] object representing the range of text selected by the user or
  /// the current position of the caret.
  external Selection? getSelection();
  external void reportError(JSAny? e);

  /// The **`btoa()`** method of the [Window] interface creates a
  /// -encoded  string from a _binary string_ (i.e., a
  /// string in which each character in the string is treated as a byte
  /// of binary data).
  ///
  /// You can use this method to encode data which may otherwise cause
  /// communication
  /// problems, transmit it, then use the [Window.atob] method to decode the
  /// data again.
  /// For example, you can encode control characters such as ASCII values 0
  /// through 31.
  external String btoa(String data);

  /// The **`atob()`** method of the [Window] interface decodes a
  /// string of data which has been encoded using  encoding. You can use
  /// the [Window.btoa] method to encode and transmit
  /// data which may otherwise cause communication problems, then transmit it
  /// and use the
  /// `atob()` method to decode the data again. For example, you can encode,
  /// transmit, and decode control characters such as  values 0 through 31.
  ///
  /// For use with arbitrary Unicode strings, see _The "Unicode Problem"_ in the
  /// glossary entry.
  external String atob(String data);
  external int setTimeout(
    TimerHandler handler,
    JSAny? arguments, [
    int timeout,
  ]);
  external void clearTimeout([int id]);
  external int setInterval(
    TimerHandler handler,
    JSAny? arguments, [
    int timeout,
  ]);
  external void clearInterval([int id]);
  external void queueMicrotask(VoidFunction callback);
  external JSPromise<ImageBitmap> createImageBitmap(
    ImageBitmapSource image, [
    JSAny optionsOrSx,
    int sy,
    int sw,
    int sh,
    ImageBitmapOptions options,
  ]);
  external JSAny? structuredClone(
    JSAny? value, [
    StructuredSerializeOptions options,
  ]);
  external JSPromise<Response> fetch(
    RequestInfo input, [
    RequestInit init,
  ]);

  /// The **`window.requestAnimationFrame()`** method tells the
  /// browser you wish to perform an animation. It requests the browser to call
  /// a
  /// user-supplied callback function before the next repaint.
  ///
  /// The frequency of calls to the callback function will generally match the
  /// display
  /// refresh rate. The most common refresh rate is 60hz,
  /// (60 cycles/frames per second), though 75hz, 120hz, and 144hz are also
  /// widely used.
  /// `requestAnimationFrame()` calls are paused in most browsers when running
  /// in
  /// background tabs or hidden `iframe`s, in order to improve
  /// performance and battery life.
  ///
  /// > **Note:** Your callback function must call `requestAnimationFrame()`
  /// > again if
  /// > you want to animate another frame. `requestAnimationFrame()` is
  /// > one-shot.
  ///
  /// > **Warning:** Be sure always to use the first argument (or some other
  /// > method for
  /// > getting the current time) to calculate how much the animation will
  /// > progress in
  /// > a frame — **otherwise, the animation will run faster on high
  /// > refresh-rate screens**.
  /// > For ways to do that, see the examples below.
  external int requestAnimationFrame(FrameRequestCallback callback);

  /// The **`window.cancelAnimationFrame()`** method cancels an
  /// animation frame request previously scheduled through a call to
  /// [window.requestAnimationFrame].
  external void cancelAnimationFrame(int handle);

  /// The **`window`** property of a [Window] object points to the window object
  /// itself.
  ///
  /// Thus, the following expressions all return the same window object:
  ///
  /// ```js
  /// window.window;
  /// window.window.window;
  /// window.window.window.window;
  /// // …
  /// ```
  ///
  /// In web pages, the window object is also a _global object_. This means:
  ///
  /// 1. Global variables of your script are, in fact, properties of `window`:
  ///
  /// ```js
  /// var global = { data: 0 };
  /// alert(global === window.global); // displays "true"
  /// ```
  ///
  /// 2. You can access the built-in properties of the window object without
  /// having to prefix them with `window.`:
  ///
  /// ```js
  /// setTimeout("alert('Hi!')", 50); // equivalent to using
  /// window.setTimeout().
  /// alert(window === window.window); // displays "true"
  /// ```
  ///
  /// The point of having the `window` property refer to the object itself, was
  /// likely to make it easy to refer to the global object. Otherwise, you'd
  /// have to do a manual `let window = this;` assignment at the top of your
  /// script.
  ///
  /// Another reason, is that without this property you wouldn't be able to
  /// write, for example, "". You'd have to use `open('https://google.com/')`
  /// instead.
  ///
  /// Yet another reason to use this property, is for libraries which wish to
  /// offer OOP-versions, and non-OOP versions (especially JavaScript modules).
  /// For example, if we refer to "this.window\.location.href", a
  /// [JavaScript module](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules)
  /// could define a property called "window" inside of a class it defined
  /// (since no global "window" variable exists for it by default) which could
  /// be created after passing in a window object to the module class'
  /// constructor. Thus, "this.window" inside of its functions would refer to
  /// that window object. In the non-namespaced version, "this.window" would
  /// refer back to "window", and also be able to readily get the document
  /// location. Another advantage, is that the objects of such a class (even if
  /// the class were defined outside of a module) could change their reference
  /// to the window at will, they would not be able to do this if they had
  /// hard-coded a reference to "window". The default in the class could still
  /// be set as the current window object.
  external Window get window;

  /// The **`Window.self`** read-only property returns the window itself, as a .
  /// It can be used with dot notation on a `window` object (that is,
  /// `window.self`) or standalone (`self`). The advantage of the standalone
  /// notation is that a similar notation exists for non-window contexts, such
  /// as in [Worker]. By using `self`, you can refer to the global scope in a
  /// way that will work not only in a window context (`self` will resolve to
  /// `window.self`) but also in a worker context (`self` will then resolve to
  /// [WorkerGlobalScope.self]).
  external Window get self;

  /// **`window.document`** returns a reference to the
  /// [document](https://developer.mozilla.org/en-US/docs/Web/API/Document)
  /// contained in the window.
  external Document get document;

  /// The `Window.name` property
  /// gets/sets the name of the window's browsing context.
  external String get name;
  external set name(String value);

  /// The **`Window.location`** read-only property returns a [Location] object
  /// with information about the current location of the document.
  ///
  /// Though `Window.location` is a _read-only_ `Location` object, you can also
  /// assign a string to it.
  /// This means that you can work with `location` as if it were a string in
  /// most cases:
  /// `location = 'http://www.example.com'` is a synonym of `location.href =
  /// 'http://www.example.com'`.
  ///
  /// See [Location] for all available properties.
  external Location get location;

  /// The `Window.history` read-only property returns a reference to the
  /// [History] object, which provides an interface for manipulating the browser
  /// _session history_ (pages visited in the tab or frame that the current page
  /// is loaded in).
  ///
  /// See
  /// [Manipulating the browser history](https://developer.mozilla.org/en-US/docs/Web/API/History_API)
  /// for examples and details. In particular, that article explains security
  /// features of the [History.pushState] and [History.replaceState] methods
  /// that you should be aware of before using them.
  external History get history;

  /// The **`customElements`** read-only property of the [Window] interface
  /// returns a reference to the [CustomElementRegistry] object, which can be
  /// used to register new
  /// [custom elements](https://developer.mozilla.org/en-US/docs/Web/API/Web_components/Using_custom_elements)
  /// and get information about previously registered custom elements.
  external CustomElementRegistry get customElements;

  /// Returns the `locationbar` object.
  ///
  /// This is one of a group of `Window` properties that contain a boolean
  /// `visible` property, that used to represent whether or not a particular
  /// part of a web browser's user interface was visible.
  ///
  /// For privacy and interoperability reasons, the value of the `visible`
  /// property is now `false` if this `Window` is a popup, and `true` otherwise.
  external BarProp get locationbar;

  /// Returns the `menubar` object.
  ///
  /// This is one of a group of `Window` properties that contain a boolean
  /// `visible` property, that used to represent whether or not a particular
  /// part of a web browser's user interface was visible.
  ///
  /// For privacy and interoperability reasons, the value of the `visible`
  /// property is now `false` if this `Window` is a popup, and `true` otherwise.
  external BarProp get menubar;

  /// Returns the `personalbar` object.
  ///
  /// This is one of a group of `Window` properties that contain a boolean
  /// `visible` property, that used to represent whether or not a particular
  /// part of a web browser's user interface was visible.
  ///
  /// For privacy and interoperability reasons, the value of the `visible`
  /// property is now `false` if this `Window` is a popup, and `true` otherwise.
  external BarProp get personalbar;

  /// Returns the `scrollbars` object.
  ///
  /// This is one of a group of `Window` properties that contain a boolean
  /// `visible` property, that used to represent whether or not a particular
  /// part of a web browser's user interface was visible.
  ///
  /// For privacy and interoperability reasons, the value of the `visible`
  /// property is now `false` if this `Window` is a popup, and `true` otherwise.
  external BarProp get scrollbars;

  /// Returns the `statusbar` object.
  ///
  /// This is one of a group of `Window` properties that contain a boolean
  /// `visible` property, that used to represent whether or not a particular
  /// part of a web browser's user interface was visible.
  ///
  /// For privacy and interoperability reasons, the value of the `visible`
  /// property is now `false` if this `Window` is a popup, and `true` otherwise.
  external BarProp get statusbar;

  /// Returns the `toolbar` object.
  ///
  /// This is one of a group of `Window` properties that contain a boolean
  /// `visible` property, that used to represent whether or not a particular
  /// part of a web browser's user interface was visible.
  ///
  /// For privacy and interoperability reasons, the value of the `visible`
  /// property is now `false` if this `Window` is a popup, and `true` otherwise.
  external BarProp get toolbar;

  /// The **`status`** property of the
  /// [Window] interface was originally intended to set the text in the status
  /// bar at the bottom of the browser window. However, the HTML standard now
  /// requires
  /// setting `window.status` to have no effect on the text displayed in the
  /// status bar.
  external String get status;
  external set status(String value);

  /// The **`Window.closed`** read-only property indicates whether
  /// the referenced window is closed or not.
  external bool get closed;

  /// Returns the window itself, which is an array-like object, listing the
  /// direct sub-frames
  /// of the current window.
  external Window get frames;

  /// Returns the number of frames (either `frame` or
  /// `iframe` elements) in the window.
  external int get length;

  /// Returns a reference to the topmost window in the window hierarchy.
  external Window? get top;

  /// The [Window] interface's
  /// **`opener`** property returns a reference to the window that
  /// opened the window, either with [Window.open], or by navigating
  /// a link with a
  /// [`target`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/a#target)
  /// attribute.
  ///
  /// In other words, if window `A` opens window `B`,
  /// `B.opener` returns `A`.
  external JSAny? get opener;
  external set opener(JSAny? value);

  /// The **`Window.parent`** property is a reference to the parent
  /// of the current window or subframe.
  ///
  /// If a window does not have a parent, its `parent` property is a reference
  /// to
  /// itself.
  ///
  /// When a window is loaded in an `iframe`, `object`, or
  /// `frame`, its parent is the window with the element embedding the
  /// window.
  external Window? get parent;

  /// The **`Window.frameElement`** property
  /// returns the element (such as `iframe` or `object`)
  /// in which the window is embedded.
  ///
  /// > **Note:** Despite this property's name, it works for documents embedded
  /// > within any embedding point, including `object`,
  /// > `iframe`, or `embed`.
  external Element? get frameElement;

  /// The **`Window.navigator`** read-only property returns a
  /// reference to the [Navigator] object, which has methods and properties
  /// about
  /// the application running the script.
  external Navigator get navigator;

  /// Returns the orientation in degrees (in 90-degree increments) of the
  /// viewport relative to the device's natural orientation.
  ///
  /// Its only possible values are `-90`, `0`, `90`, and `180`. Positive values
  /// are counterclockwise; negative values are clockwise.
  ///
  /// This property is deprecated. Use the [Screen.orientation] property
  /// instead, available on the [window.screen] property.
  external int get orientation;
  external EventHandler get onorientationchange;
  external set onorientationchange(EventHandler value);

  /// The [Window] property **`screen`** returns a
  /// reference to the screen object associated with the window. The `screen`
  /// object, implementing the [Screen] interface, is a special object for
  /// inspecting properties of the screen on which the current window is being
  /// rendered.
  external Screen get screen;

  /// The **`visualViewport`** read-only property of the [Window] interface
  /// returns a [VisualViewport] object representing the visual viewport for a
  /// given window, or `null` if current document is not fully active.
  external VisualViewport? get visualViewport;

  /// The read-only [Window] property **`innerWidth`** returns the interior
  /// width of the window in pixels (that is, the width of the window's ). That
  /// includes the width of the vertical scroll bar, if one is present.
  ///
  /// Similarly, the interior height of the window (that is, the height of the
  /// layout viewport) can be obtained using the [Window.innerHeight] property.
  /// That measurement also accounts for the height of the horizontal scroll
  /// bar, if it is visible.
  external int get innerWidth;

  /// The read-only **`innerHeight`** property of the
  /// [Window] interface returns the interior height of the window in pixels,
  /// including the height of the horizontal scroll bar, if present.
  ///
  /// The value of `innerHeight` is taken from the height of the window's
  /// . The width can be obtained using the
  /// [Window.innerWidth] property.
  external int get innerHeight;

  /// The read-only **`scrollX`** property of the [Window] interface returns the
  /// number of pixels by which the document is currently scrolled horizontally.
  /// This value is subpixel precise in modern browsers, meaning that it isn't
  /// necessarily a whole number. You can get the number of pixels the document
  /// is scrolled vertically from the [Window.scrollY] property.
  external double get scrollX;

  /// The read-only **`scrollY`** property of the [Window] interface returns the
  /// number of pixels by which the document is currently scrolled vertically.
  /// This value is subpixel precise in modern browsers, meaning that it isn't
  /// necessarily a whole number. You can get the number of pixels the document
  /// is scrolled horizontally from the [Window.scrollX] property.
  external double get scrollY;

  /// The **`Window.screenX`** read-only property returns the
  /// horizontal distance, in CSS pixels, of the left border of the user's
  /// browser viewport to
  /// the left side of the screen.
  ///
  /// > **Note:** An alias of `screenX` was implemented across modern
  /// > browsers in more recent times — [Window.screenLeft]. This was originally
  /// > supported only in IE but was introduced everywhere due to popularity.
  external int get screenX;

  /// The **`Window.screenLeft`** read-only property returns the
  /// horizontal distance, in CSS pixels, from the left border of the user's
  /// browser viewport
  /// to the left side of the screen.
  ///
  /// > **Note:** `screenLeft` is an alias of the older
  /// > [Window.screenX] property. `screenLeft` was originally
  /// > supported only in IE but was introduced everywhere due to popularity.
  external int get screenLeft;

  /// The **`Window.screenY`** read-only property returns the vertical distance,
  /// in CSS pixels, of the top border of the user's browser viewport to the top
  /// edge of the screen.
  ///
  /// > **Note:** An alias of `screenY` was implemented across modern browsers
  /// > in more recent times — [Window.screenTop]. This was originally supported
  /// > only in IE but was introduced everywhere due to popularity.
  external int get screenY;

  /// The **`Window.screenTop`** read-only property returns the
  /// vertical distance, in CSS pixels, from the top border of the user's
  /// browser viewport to
  /// the top side of the screen.
  ///
  /// > **Note:** `screenTop` is an alias of the older
  /// > [Window.screenY] property. `screenTop` was originally
  /// > supported only in IE but was introduced everywhere due to popularity.
  external int get screenTop;

  /// **`Window.outerWidth`** read-only property returns the width of the
  /// outside of the browser window. It represents the width of the whole
  /// browser window including sidebar (if expanded), window chrome and window
  /// resizing borders/handles.
  external int get outerWidth;

  /// The **`Window.outerHeight`** read-only property returns the height in
  /// pixels of the whole browser window, including any sidebar, window chrome,
  /// and window-resizing borders/handles.
  external int get outerHeight;

  /// The **`devicePixelRatio`** of
  /// [Window] interface returns the ratio of the resolution in _physical
  /// pixels_ to the resolution in _CSS pixels_ for the current display
  /// device.
  ///
  /// This value could also be interpreted as the ratio of pixel sizes: the
  /// size of one _CSS pixel_ to the size of one _physical pixel_. In simpler
  /// terms, this tells the browser how many of the screen's actual pixels
  /// should be used to
  /// draw a single CSS pixel.
  ///
  /// This is useful when dealing with the difference between rendering on a
  /// standard display
  /// versus a HiDPI or Retina display, which use more screen pixels to draw the
  /// same objects,
  /// resulting in a sharper image.
  ///
  /// You can use [Window.matchMedia] to check if the
  /// value of `devicePixelRatio` changes (which can happen, for example, if the
  /// user drags the window to a display with a different pixel density). See
  /// [the example below](#monitoring_screen_resolution_or_zoom_level_changes).
  external double get devicePixelRatio;

  /// The read-only [Window] property **`event`** returns the [Event] which is
  /// currently being handled by the site's code. Outside the context of an
  /// event handler, the value is always `undefined`.
  ///
  /// You _should_ avoid using this property in new code, and should instead use
  /// the [Event] passed into the event handler function. This property is not
  /// universally supported and even when supported introduces potential
  /// fragility to your code.
  ///
  /// > **Note:** This property can be fragile, in that there may be situations
  /// > in which the returned `Event` is not the expected value. In addition,
  /// > `Window.event` is not accurate for events dispatched within .
  external Event? get event;

  /// The `external` property of the [Window] API returns an instance of the
  /// `External` interface, which was intended to contain functions related to
  /// adding external search providers to the browser. However, this is now
  /// deprecated, and the contained methods are now dummy functions that do
  /// nothing as per spec.
  external External get external;
  external EventHandler get onappinstalled;
  external set onappinstalled(EventHandler value);
  external EventHandler get onbeforeinstallprompt;
  external set onbeforeinstallprompt(EventHandler value);
  external EventHandler get ondeviceorientation;
  external set ondeviceorientation(EventHandler value);
  external EventHandler get ondeviceorientationabsolute;
  external set ondeviceorientationabsolute(EventHandler value);
  external EventHandler get ondevicemotion;
  external set ondevicemotion(EventHandler value);

  /// The `speechSynthesis` read-only property of the Window object returns a
  /// [SpeechSynthesis] object, which is the entry point into using
  /// [Web Speech API](https://developer.mozilla.org/en-US/docs/Web/API/Web_Speech_API)
  /// speech synthesis functionality.
  external SpeechSynthesis get speechSynthesis;
  external EventHandler get onabort;
  external set onabort(EventHandler value);
  external EventHandler get onauxclick;
  external set onauxclick(EventHandler value);
  external EventHandler get onbeforeinput;
  external set onbeforeinput(EventHandler value);
  external EventHandler get onbeforetoggle;
  external set onbeforetoggle(EventHandler value);
  external EventHandler get onblur;
  external set onblur(EventHandler value);
  external EventHandler get oncancel;
  external set oncancel(EventHandler value);
  external EventHandler get oncanplay;
  external set oncanplay(EventHandler value);
  external EventHandler get oncanplaythrough;
  external set oncanplaythrough(EventHandler value);
  external EventHandler get onchange;
  external set onchange(EventHandler value);
  external EventHandler get onclick;
  external set onclick(EventHandler value);
  external EventHandler get onclose;
  external set onclose(EventHandler value);
  external EventHandler get oncontextlost;
  external set oncontextlost(EventHandler value);
  external EventHandler get oncontextmenu;
  external set oncontextmenu(EventHandler value);
  external EventHandler get oncontextrestored;
  external set oncontextrestored(EventHandler value);
  external EventHandler get oncopy;
  external set oncopy(EventHandler value);
  external EventHandler get oncuechange;
  external set oncuechange(EventHandler value);
  external EventHandler get oncut;
  external set oncut(EventHandler value);
  external EventHandler get ondblclick;
  external set ondblclick(EventHandler value);
  external EventHandler get ondrag;
  external set ondrag(EventHandler value);
  external EventHandler get ondragend;
  external set ondragend(EventHandler value);
  external EventHandler get ondragenter;
  external set ondragenter(EventHandler value);
  external EventHandler get ondragleave;
  external set ondragleave(EventHandler value);
  external EventHandler get ondragover;
  external set ondragover(EventHandler value);
  external EventHandler get ondragstart;
  external set ondragstart(EventHandler value);
  external EventHandler get ondrop;
  external set ondrop(EventHandler value);
  external EventHandler get ondurationchange;
  external set ondurationchange(EventHandler value);
  external EventHandler get onemptied;
  external set onemptied(EventHandler value);
  external EventHandler get onended;
  external set onended(EventHandler value);
  external OnErrorEventHandler get onerror;
  external set onerror(OnErrorEventHandler value);
  external EventHandler get onfocus;
  external set onfocus(EventHandler value);
  external EventHandler get onformdata;
  external set onformdata(EventHandler value);
  external EventHandler get oninput;
  external set oninput(EventHandler value);
  external EventHandler get oninvalid;
  external set oninvalid(EventHandler value);
  external EventHandler get onkeydown;
  external set onkeydown(EventHandler value);
  external EventHandler get onkeypress;
  external set onkeypress(EventHandler value);
  external EventHandler get onkeyup;
  external set onkeyup(EventHandler value);
  external EventHandler get onload;
  external set onload(EventHandler value);
  external EventHandler get onloadeddata;
  external set onloadeddata(EventHandler value);
  external EventHandler get onloadedmetadata;
  external set onloadedmetadata(EventHandler value);
  external EventHandler get onloadstart;
  external set onloadstart(EventHandler value);
  external EventHandler get onmousedown;
  external set onmousedown(EventHandler value);
  external EventHandler get onmouseenter;
  external set onmouseenter(EventHandler value);
  external EventHandler get onmouseleave;
  external set onmouseleave(EventHandler value);
  external EventHandler get onmousemove;
  external set onmousemove(EventHandler value);
  external EventHandler get onmouseout;
  external set onmouseout(EventHandler value);
  external EventHandler get onmouseover;
  external set onmouseover(EventHandler value);
  external EventHandler get onmouseup;
  external set onmouseup(EventHandler value);
  external EventHandler get onpaste;
  external set onpaste(EventHandler value);
  external EventHandler get onpause;
  external set onpause(EventHandler value);
  external EventHandler get onplay;
  external set onplay(EventHandler value);
  external EventHandler get onplaying;
  external set onplaying(EventHandler value);
  external EventHandler get onprogress;
  external set onprogress(EventHandler value);
  external EventHandler get onratechange;
  external set onratechange(EventHandler value);
  external EventHandler get onreset;
  external set onreset(EventHandler value);
  external EventHandler get onresize;
  external set onresize(EventHandler value);
  external EventHandler get onscroll;
  external set onscroll(EventHandler value);
  external EventHandler get onscrollend;
  external set onscrollend(EventHandler value);
  external EventHandler get onsecuritypolicyviolation;
  external set onsecuritypolicyviolation(EventHandler value);
  external EventHandler get onseeked;
  external set onseeked(EventHandler value);
  external EventHandler get onseeking;
  external set onseeking(EventHandler value);
  external EventHandler get onselect;
  external set onselect(EventHandler value);
  external EventHandler get onslotchange;
  external set onslotchange(EventHandler value);
  external EventHandler get onstalled;
  external set onstalled(EventHandler value);
  external EventHandler get onsubmit;
  external set onsubmit(EventHandler value);
  external EventHandler get onsuspend;
  external set onsuspend(EventHandler value);
  external EventHandler get ontimeupdate;
  external set ontimeupdate(EventHandler value);
  external EventHandler get ontoggle;
  external set ontoggle(EventHandler value);
  external EventHandler get onvolumechange;
  external set onvolumechange(EventHandler value);
  external EventHandler get onwaiting;
  external set onwaiting(EventHandler value);
  external EventHandler get onwheel;
  external set onwheel(EventHandler value);
  external EventHandler get onanimationstart;
  external set onanimationstart(EventHandler value);
  external EventHandler get onanimationiteration;
  external set onanimationiteration(EventHandler value);
  external EventHandler get onanimationend;
  external set onanimationend(EventHandler value);
  external EventHandler get onanimationcancel;
  external set onanimationcancel(EventHandler value);
  external EventHandler get ontransitionrun;
  external set ontransitionrun(EventHandler value);
  external EventHandler get ontransitionstart;
  external set ontransitionstart(EventHandler value);
  external EventHandler get ontransitionend;
  external set ontransitionend(EventHandler value);
  external EventHandler get ontransitioncancel;
  external set ontransitioncancel(EventHandler value);
  external EventHandler get onpointerover;
  external set onpointerover(EventHandler value);
  external EventHandler get onpointerenter;
  external set onpointerenter(EventHandler value);
  external EventHandler get onpointerdown;
  external set onpointerdown(EventHandler value);
  external EventHandler get onpointermove;
  external set onpointermove(EventHandler value);
  external EventHandler get onpointerup;
  external set onpointerup(EventHandler value);
  external EventHandler get onpointercancel;
  external set onpointercancel(EventHandler value);
  external EventHandler get onpointerout;
  external set onpointerout(EventHandler value);
  external EventHandler get onpointerleave;
  external set onpointerleave(EventHandler value);
  external EventHandler get ongotpointercapture;
  external set ongotpointercapture(EventHandler value);
  external EventHandler get onlostpointercapture;
  external set onlostpointercapture(EventHandler value);
  external EventHandler get onselectstart;
  external set onselectstart(EventHandler value);
  external EventHandler get onselectionchange;
  external set onselectionchange(EventHandler value);
  external EventHandler get ontouchstart;
  external set ontouchstart(EventHandler value);
  external EventHandler get ontouchend;
  external set ontouchend(EventHandler value);
  external EventHandler get ontouchmove;
  external set ontouchmove(EventHandler value);
  external EventHandler get ontouchcancel;
  external set ontouchcancel(EventHandler value);
  external EventHandler get onafterprint;
  external set onafterprint(EventHandler value);
  external EventHandler get onbeforeprint;
  external set onbeforeprint(EventHandler value);
  external OnBeforeUnloadEventHandler get onbeforeunload;
  external set onbeforeunload(OnBeforeUnloadEventHandler value);
  external EventHandler get onhashchange;
  external set onhashchange(EventHandler value);
  external EventHandler get onlanguagechange;
  external set onlanguagechange(EventHandler value);
  external EventHandler get onmessage;
  external set onmessage(EventHandler value);
  external EventHandler get onmessageerror;
  external set onmessageerror(EventHandler value);
  external EventHandler get onoffline;
  external set onoffline(EventHandler value);
  external EventHandler get ononline;
  external set ononline(EventHandler value);
  external EventHandler get onpagehide;
  external set onpagehide(EventHandler value);
  external EventHandler get onpageshow;
  external set onpageshow(EventHandler value);
  external EventHandler get onpopstate;
  external set onpopstate(EventHandler value);
  external EventHandler get onrejectionhandled;
  external set onrejectionhandled(EventHandler value);
  external EventHandler get onstorage;
  external set onstorage(EventHandler value);
  external EventHandler get onunhandledrejection;
  external set onunhandledrejection(EventHandler value);
  external EventHandler get onunload;
  external set onunload(EventHandler value);
  external EventHandler get ongamepadconnected;
  external set ongamepadconnected(EventHandler value);
  external EventHandler get ongamepaddisconnected;
  external set ongamepaddisconnected(EventHandler value);

  /// The **`origin`** read-only property of the [Window] interface returns the
  /// origin of the global scope, serialized as a string.
  external String get origin;

  /// The **`isSecureContext`** read-only property of the [Window] interface
  /// returns a boolean indicating whether the current
  /// [context is secure](https://developer.mozilla.org/en-US/docs/Web/Security/Secure_Contexts)
  /// (`true`) or not (`false`).
  external bool get isSecureContext;

  /// The **`crossOriginIsolated`** read-only property of the [Window] interface
  /// returns a boolean value that
  /// indicates whether the website is in a cross-origin isolation state. That
  /// state mitigates the risk of side-channel attacks and unlocks a few
  /// capabilities:
  ///
  /// - `SharedArrayBuffer` can be created and sent via a [Window.postMessage]
  ///   or a [MessagePort.postMessage] call.
  /// - [Performance.now] offers better precision.
  /// - [Performance.measureUserAgentSpecificMemory] can be accessed.
  ///
  /// A website is in a cross-origin isolated state, when the response header
  /// has the value `same-origin` and the  header has the value `require-corp`
  /// or `credentialless`.
  external bool get crossOriginIsolated;

  /// The **`indexedDB`** read-only property of the [Window] interface provides
  /// a mechanism for applications to
  /// asynchronously access the capabilities of indexed databases.
  external IDBFactory get indexedDB;

  /// The **`crypto`** read-only property of the [Window] interface returns the
  /// [Crypto] object for this window's scope. This object gives web pages
  /// access to certain cryptographic related services.
  ///
  /// Although the property itself is read-only, all of its methods (and the
  /// methods of its
  /// child object, [SubtleCrypto]) are not read-only, and therefore vulnerable
  /// to attack by .
  ///
  /// Although `crypto` is available on all windows, the returned `Crypto`
  /// object only has one usable feature in insecure contexts: the
  /// [Crypto.getRandomValues] method. In general, you should use this API only
  /// in secure contexts.
  external Crypto get crypto;

  /// The **`performance`** property of the [Window] interface returns a
  /// [Performance] object, which can be used to gather performance information
  /// about code running in the window's scope.
  ///
  /// Performance entries are per context. If you create a mark on the main
  /// thread (or other worker), you cannot see it in a worker thread, and vice
  /// versa.
  external Performance get performance;

  /// The **`scheduler`** read-only property of the [Window] interface is the
  /// entry point for using the
  /// [Prioritized Task Scheduling API](https://developer.mozilla.org/en-US/docs/Web/API/Prioritized_Task_Scheduling_API).
  ///
  /// The object has a single instance method [Scheduler.postTask] that is used
  /// to post prioritized tasks for scheduling.
  external Scheduler get scheduler;

  /// The **`caches`** read-only property of the [Window] interface returns the
  /// [CacheStorage] object associated with the current context.
  /// This object enables functionality such as storing assets for offline use,
  /// and generating custom responses to requests.
  external CacheStorage get caches;

  /// The **`trustedTypes`** read-only property of the [Window] interface
  /// returns the [TrustedTypePolicyFactory] object associated with the global
  /// object, providing the entry point for using the [Trusted Types API].
  external TrustedTypePolicyFactory get trustedTypes;

  /// The read-only **`sessionStorage`**
  /// property accesses a session [Storage] object for the current
  /// . `sessionStorage` is similar to
  /// [Window.localStorage]; the difference is that while data
  /// in `localStorage` doesn't expire, data in `sessionStorage` is
  /// cleared when the _page session_ ends.
  ///
  /// - Whenever a document is loaded in a particular tab in the browser, a
  ///   unique page
  /// session gets created and assigned to that particular tab. That page
  /// session is valid
  /// only for that particular tab.
  /// - A page session lasts as long as the tab or the browser is open, and
  ///   survives over
  /// page reloads and restores.
  /// - **Opening a page in a new tab or window creates a new session with the
  ///   value
  /// of the top-level browsing context, which differs from how session cookies
  /// work.**
  /// - Opening multiple tabs/windows with the same URL creates `sessionStorage`
  /// for each tab/window.
  /// - Duplicating a tab copies the tab's `sessionStorage` into the new
  /// tab.
  /// - Closing a tab/window ends the session and clears objects in
  /// `sessionStorage`.
  ///
  /// Data stored in `sessionStorage` **is specific to the protocol of the
  /// page**. In particular, data stored by a script on a site accessed with
  /// HTTP
  /// (e.g., [http://example.com](https://example.com)) is
  /// put in a different `sessionStorage` object from the same site accessed
  /// with
  /// HTTPS (e.g., <https://example.com>).
  ///
  /// The keys and the values are _always_ in the UTF-16 string
  /// format, which uses two bytes per character. As with objects, integer keys
  /// are
  /// automatically converted to strings.
  external Storage get sessionStorage;

  /// The **`localStorage`** read-only property of the [window] interface allows
  /// you to access a [Storage] object for the [Document]'s ; the stored data is
  /// saved across browser sessions.
  ///
  /// `localStorage` is similar to [Window.sessionStorage], except that while
  /// `localStorage` data has no expiration time, `sessionStorage` data gets
  /// cleared when the page session ends — that is, when the page is closed.
  /// (`localStorage` data for a document loaded in a "private browsing" or
  /// "incognito" session is cleared when the last "private" tab is closed.)
  external Storage get localStorage;
}
extension type WindowPostMessageOptions._(JSObject _)
    implements StructuredSerializeOptions, JSObject {
  external factory WindowPostMessageOptions({
    JSArray<JSObject> transfer,
    String targetOrigin,
  });

  external String get targetOrigin;
  external set targetOrigin(String value);
}

/// The **`BarProp`** interface of the [Document Object Model] represents the
/// web browser user interface elements that are exposed to scripts in web
/// pages. Each of the following interface elements are represented by a
/// `BarProp` object.
///
/// - [Window.locationbar]
///   - : The browser location bar.
/// - [Window.menubar]
///   - : The browser menu bar.
/// - [Window.personalbar]
///   - : The browser personal bar.
/// - [Window.scrollbars]
///   - : The browser scrollbars.
/// - [Window.statusbar]
///   - : The browser status bar.
/// - [Window.toolbar]
///   - : The browser toolbar.
///
/// The `BarProp` interface is not accessed directly, but via one of these
/// elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/BarProp).
extension type BarProp._(JSObject _) implements JSObject {
  /// The **`visible`** read-only property of the [BarProp] interface returns
  /// `true` if the user interface element it represents is visible.
  external bool get visible;
}

/// The **`Location`** interface represents the location (URL) of the object it
/// is linked to. Changes done on it are reflected on the object it relates to.
/// Both the [Document] and [Window] interface have such a linked `Location`,
/// accessible via [Document.location] and [Window.location] respectively.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/Location).
extension type Location._(JSObject _) implements JSObject {
  /// The **`assign()`** method of the [Location]
  /// interface causes the window to load
  /// and display the document at the URL specified. After the navigation
  /// occurs, the user can
  /// navigate back to the page that called `Location.assign()` by pressing the
  /// "back" button.
  external void assign(String url);

  /// The **`replace()`** method of the [Location]
  /// interface replaces the current resource with the one at the provided URL.
  /// The difference
  /// from the [Location.assign] method is that after using
  /// `replace()` the current page will not be saved in session [History],
  /// meaning the user won't be able to use the _back_ button to navigate to it.
  external void replace(String url);

  /// The **`reload()`** method of the [Location] interface reloads the current
  /// URL, like the Refresh button.
  external void reload();

  /// The **`href`** property of the [Location]
  /// interface is a  that returns a string containing the whole
  /// URL, and allows the href to be updated.
  ///
  /// Setting the value of `href` _navigates_ to the provided URL. If you
  /// want _redirection_, use [Location.replace]. The difference from setting
  /// the `href` property value is that when using the `location.replace()`
  /// method, after navigating to the given URL, the current page will not be
  /// saved in session
  /// [history](https://developer.mozilla.org/en-US/docs/Web/API/History_API) —
  /// meaning the user won't be able to use the back button to navigate to it.
  external String get href;
  external set href(String value);

  /// The **`origin`** read-only property of the [Location] interface is a
  /// string containing the Unicode serialization of the origin of the
  /// represented URL.
  ///
  /// The exact structure varies depending on the type of URL:
  ///
  /// - For URL using the `http:` or `https:` schemes, the scheme followed by
  ///   `//`, followed by the domain, followed by `:`, followed by the port (the
  ///   default port, `80` and `443` respectively, if explicitly specified).
  /// - For URL using `file:` scheme, the value is browser dependent.
  /// - For URL using the `blob:` scheme, the origin of the URL following
  ///   `blob:`. For example, `blob:https://mozilla.org` will have
  ///   `https://mozilla.org`.
  external String get origin;

  /// The **`protocol`** property of the [Location]
  /// interface is a string representing the protocol scheme of the URL,
  /// including the final `':'`.
  external String get protocol;
  external set protocol(String value);

  /// The **`host`** property of the [Location]
  /// interface is a string containing the host, that is the
  /// _hostname_, and then, if the _port_ of the URL is nonempty, a
  /// `':'`, and the _port_ of the URL.
  external String get host;
  external set host(String value);

  /// The **`hostname`** property of the [Location]
  /// interface is a string containing the  of the URL.
  external String get hostname;
  external set hostname(String value);

  /// The **`port`** property of the [Location]
  /// interface is a string containing the port number of the URL. If the
  /// URL does not contain an explicit port number, it will be set to `''`.
  external String get port;
  external set port(String value);

  /// The **`pathname`** property of the [Location]
  /// interface is a string containing the path of the URL for the location. If
  /// there is no path, `pathname` will be empty: otherwise, `pathname` contains
  /// an initial '/' followed by the path of the URL, not including the query
  /// string or fragment.
  external String get pathname;
  external set pathname(String value);

  /// The **`search`** property of the [Location]
  /// interface is a search string, also called a _query string_; that is, a
  /// string containing a `'?'` followed by the parameters of the
  /// URL.
  ///
  /// Modern browsers provide
  /// [`URLSearchParams`](https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams/get#examples)
  /// and
  /// [`URL.searchParams`](/en-US/docs/Web/API/URL/searchParams#examples)
  /// to make it easy to parse out the parameters from the querystring.
  external String get search;
  external set search(String value);

  /// The **`hash`** property of the
  /// [Location] interface returns a string containing a
  /// `'#'` followed by the fragment identifier of the URL — the ID on the page
  /// that the URL is trying to target.
  ///
  /// The fragment is not
  /// [URL decoded](https://en.wikipedia.org/wiki/URL_encoding). If the URL does
  /// not
  /// have a fragment identifier, this property contains an empty string, `""`.
  external String get hash;
  external set hash(String value);

  /// The **`ancestorOrigins`** read-only
  /// property of the [Location] interface is a static
  /// [DOMStringList] containing, in reverse order, the origins of all ancestor
  /// browsing contexts of the document associated with the given [Location]
  /// object.
  ///
  /// You can use `location.ancestorOrigins` in the script for a document to
  /// determine, for example, whenever the document is being framed by a site
  /// which you don't
  /// expect it to be framed by. You can also use it to vary the behavior of the
  /// document
  /// based on what site or list of sites is framing it.
  external DOMStringList get ancestorOrigins;
}

/// The **`History`** interface of the [History API] allows manipulation of the
/// browser _session history_, that is the pages visited in the tab or frame
/// that the current page is loaded in.
///
/// There is only one instance of `history` (It is a _singleton_.) accessible
/// via the global object [Window.history].
///
/// > **Note:** This interface is only available on the main thread ([Window]).
/// > It cannot be accessed in [Worker] or [Worklet] contexts.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/History).
extension type History._(JSObject _) implements JSObject {
  /// The **`go()`** method of the [History] interface loads a specific page
  /// from the
  /// session history. You can use it to move forwards and backwards through the
  /// history
  /// depending on the value of a parameter.
  ///
  /// This method is . Add a listener for the
  /// [Window.popstate_event] event in order to determine when the navigation
  /// has completed.
  external void go([int delta]);

  /// The **`back()`** method of the [History] interface causes
  /// the browser to move back one page in the session history.
  ///
  /// It has the same
  /// effect as calling . If there is no previous
  /// page, this method call does nothing.
  ///
  /// This method is . Add a listener for the
  /// [Window.popstate_event] event in order to determine when the navigation
  /// has completed.
  external void back();

  /// The **`forward()`** method of the [History] interface causes the browser
  /// to move
  /// forward one page in the session history. It has the same effect as calling
  /// [History.go].
  ///
  /// This method is . Add a listener for the [Window.popstate_event] event in
  /// order to determine when the navigation has completed.
  external void forward();

  /// The **`pushState()`** method of the [History] interface adds an entry to
  /// the browser's
  /// session history stack.
  external void pushState(
    JSAny? data,
    String unused, [
    String? url,
  ]);

  /// The **`replaceState()`** method of the [History] interface modifies the
  /// current
  /// history entry, replacing it with the state object and
  /// URL passed in the method parameters. This method is particularly useful
  /// when you want to update the state object or URL of the current history
  /// entry in response
  /// to some user action.
  external void replaceState(
    JSAny? data,
    String unused, [
    String? url,
  ]);

  /// The **`length`** read-only property of the [History] interface
  /// returns an integer representing the number of elements in the session
  /// history, including the currently loaded page.
  ///
  /// For example, for a page loaded in a new tab this property returns `1`.
  external int get length;

  /// The **`scrollRestoration`** property of the [History]
  /// interface allows web applications to explicitly set default scroll
  /// restoration behavior
  /// on history navigation.
  external ScrollRestoration get scrollRestoration;
  external set scrollRestoration(ScrollRestoration value);

  /// The **`state`** read-only property of the [History] interface
  /// returns a value representing the state at the top of the history stack.
  /// This is
  /// a way to look at the state without having to wait for a
  /// [Window.popstate_event] event.
  external JSAny? get state;
}

/// **`PopStateEvent`** is an interface for the
/// [`popstate`](https://developer.mozilla.org/en-US/docs/Web/API/Window/popstate_event)
/// event.
///
/// A `popstate` event is dispatched to the window every time the active history
/// entry changes between two history entries for the same document. If the
/// history entry
/// being activated was created by a call to `history.pushState()` or was
/// affected by a call to `history.replaceState()`, the `popstate`
/// event's `state` property contains a copy of the history entry's state
/// object.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/PopStateEvent).
extension type PopStateEvent._(JSObject _) implements Event, JSObject {
  external factory PopStateEvent(
    String type, [
    PopStateEventInit eventInitDict,
  ]);

  /// The **`state`** read-only property of the [PopStateEvent] interface
  /// represents the state stored when the event was created.
  ///
  /// Practically it is a value provided by the call to [history.pushState] or
  /// [history.replaceState]
  external JSAny? get state;
  external bool get hasUAVisualTransition;
}
extension type PopStateEventInit._(JSObject _) implements EventInit, JSObject {
  external factory PopStateEventInit({
    bool bubbles,
    bool cancelable,
    bool composed,
    JSAny? state,
    bool hasUAVisualTransition,
  });

  external JSAny? get state;
  external set state(JSAny? value);
  external bool get hasUAVisualTransition;
  external set hasUAVisualTransition(bool value);
}

/// The **`HashChangeEvent`** interface represents events that fire when the
/// fragment identifier of the URL has changed.
///
/// The fragment identifier is the part of the URL that follows (and includes)
/// the `#` symbol.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HashChangeEvent).
extension type HashChangeEvent._(JSObject _) implements Event, JSObject {
  external factory HashChangeEvent(
    String type, [
    HashChangeEventInit eventInitDict,
  ]);

  /// The **`oldURL`** read-only property of the
  /// [HashChangeEvent] interface returns the previous URL from which the window
  /// was navigated.
  external String get oldURL;

  /// The **`newURL`** read-only property of the
  /// [HashChangeEvent] interface returns the new URL to which the window is
  /// navigating.
  external String get newURL;
}
extension type HashChangeEventInit._(JSObject _)
    implements EventInit, JSObject {
  external factory HashChangeEventInit({
    bool bubbles,
    bool cancelable,
    bool composed,
    String oldURL,
    String newURL,
  });

  external String get oldURL;
  external set oldURL(String value);
  external String get newURL;
  external set newURL(String value);
}

/// The **`PageTransitionEvent`** event object is available inside handler
/// functions for the
/// [`pageshow`](https://developer.mozilla.org/en-US/docs/Web/API/Window/pageshow_event)
/// and
/// [`pagehide`](https://developer.mozilla.org/en-US/docs/Web/API/Window/pagehide_event)
/// events, fired when a document is being loaded or unloaded.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/PageTransitionEvent).
extension type PageTransitionEvent._(JSObject _) implements Event, JSObject {
  external factory PageTransitionEvent(
    String type, [
    PageTransitionEventInit eventInitDict,
  ]);

  /// The **`persisted`** read-only property indicates if a webpage is loading
  /// from a cache.
  external bool get persisted;
}
extension type PageTransitionEventInit._(JSObject _)
    implements EventInit, JSObject {
  external factory PageTransitionEventInit({
    bool bubbles,
    bool cancelable,
    bool composed,
    bool persisted,
  });

  external bool get persisted;
  external set persisted(bool value);
}

/// The **`BeforeUnloadEvent`** interface represents the event object for the
/// [Window.beforeunload_event] event, which is fired when the current window,
/// contained document, and associated resources are about to be unloaded.
///
/// See the [Window.beforeunload_event] event reference for detailed guidance on
/// using this event.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/BeforeUnloadEvent).
extension type BeforeUnloadEvent._(JSObject _) implements Event, JSObject {
  /// The **`returnValue`** property of the
  /// [BeforeUnloadEvent] interface, when set to a truthy value, triggers a
  /// browser-generated confirmation dialog asking users to confirm if they
  /// _really_ want to leave the page when they try to close or reload it, or
  /// navigate somewhere else. This is intended to help prevent loss of unsaved
  /// data.
  ///
  /// > **Note:** `returnValue` is a legacy feature, and best practice is to
  /// > trigger the dialog by invoking [Event.preventDefault] on the
  /// > `BeforeUnloadEvent` object, while also setting `returnValue` to support
  /// > legacy cases. See the [Window.beforeunload_event] event reference for
  /// > detailed up-to-date guidance.
  external String get returnValue;
  external set returnValue(String value);
}

/// The **`ErrorEvent`** interface represents events providing information
/// related to errors in scripts or in files.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/ErrorEvent).
extension type ErrorEvent._(JSObject _) implements Event, JSObject {
  external factory ErrorEvent(
    String type, [
    ErrorEventInit eventInitDict,
  ]);

  external String get message;
  external String get filename;
  external int get lineno;
  external int get colno;
  external JSAny? get error;
}
extension type ErrorEventInit._(JSObject _) implements EventInit, JSObject {
  external factory ErrorEventInit({
    bool bubbles,
    bool cancelable,
    bool composed,
    String message,
    String filename,
    int lineno,
    int colno,
    JSAny? error,
  });

  external String get message;
  external set message(String value);
  external String get filename;
  external set filename(String value);
  external int get lineno;
  external set lineno(int value);
  external int get colno;
  external set colno(int value);
  external JSAny? get error;
  external set error(JSAny? value);
}

/// The **`PromiseRejectionEvent`** interface represents events which are sent
/// to the global script context when JavaScript `Promise`s are rejected. These
/// events are particularly useful for telemetry and debugging purposes.
///
/// For details, see
/// [Promise rejection events](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Using_promises#promise_rejection_events).
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/PromiseRejectionEvent).
extension type PromiseRejectionEvent._(JSObject _) implements Event, JSObject {
  external factory PromiseRejectionEvent(
    String type,
    PromiseRejectionEventInit eventInitDict,
  );

  /// The [PromiseRejectionEvent] interface's
  /// **`promise`** read-only property indicates the JavaScript
  /// `Promise` which was rejected. You can examine the event's
  /// [PromiseRejectionEvent.reason] property to learn why the promise was
  /// rejected.
  external JSObject get promise;

  /// The [PromiseRejectionEvent] **`reason`** read-only
  /// property is any JavaScript value or `Object` which provides the reason
  /// passed into `Promise.reject()`. This in theory provides information about
  /// why the promise was rejected.
  external JSAny? get reason;
}
extension type PromiseRejectionEventInit._(JSObject _)
    implements EventInit, JSObject {
  external factory PromiseRejectionEventInit({
    bool bubbles,
    bool cancelable,
    bool composed,
    required JSObject promise,
    JSAny? reason,
  });

  external JSObject get promise;
  external set promise(JSObject value);
  external JSAny? get reason;
  external set reason(JSAny? value);
}
extension type GetHTMLOptions._(JSObject _) implements JSObject {
  external factory GetHTMLOptions({
    bool serializableShadowRoots,
    JSArray<ShadowRoot> shadowRoots,
  });

  external bool get serializableShadowRoots;
  external set serializableShadowRoots(bool value);
  external JSArray<ShadowRoot> get shadowRoots;
  external set shadowRoots(JSArray<ShadowRoot> value);
}

/// The **`DOMParser`** interface provides
/// the ability to parse  or  source code from a
/// string into a DOM [Document].
///
/// You can perform the opposite operation—converting a DOM tree into XML or
/// HTML
/// source—using the [XMLSerializer] interface.
///
/// In the case of an HTML document, you can also replace portions of the DOM
/// with new DOM
/// trees built from HTML by setting the value of the [Element.innerHTML] and
/// [Element.outerHTML] properties. These properties can also be
/// read to fetch HTML fragments corresponding to the corresponding DOM subtree.
///
/// Note that [XMLHttpRequest] can parse XML and HTML directly
/// from a URL-addressable resource, returning a `Document` in its
/// [XMLHttpRequest.response] property.
///
/// > **Note:** Be aware that
/// > [block-level elements](https://developer.mozilla.org/en-US/docs/Glossary/Block-level_content)
/// > like `<p>` will be automatically closed if another
/// > block-level element is nested inside and therefore parsed before the
/// > closing `</p>` tag.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/DOMParser).
extension type DOMParser._(JSObject _) implements JSObject {
  external factory DOMParser();

  /// The **`parseFromString()`** method of the [DOMParser] interface parses a
  /// string containing either HTML or XML, returning an [HTMLDocument] or an
  /// [XMLDocument].
  ///
  /// > **Note:** The
  /// > [`Document.parseHTMLUnsafe()`](https://developer.mozilla.org/en-US/docs/Web/API/Document/parseHTMLUnsafe_static)
  /// > static method provides an ergonomic alternative for parsing HTML strings
  /// > into a [Document].
  external Document parseFromString(
    JSAny string,
    DOMParserSupportedType type,
  );
}

/// The **`Navigator`** interface represents the state and the identity of the
/// user agent. It allows scripts to query it and to register themselves to
/// carry on some activities.
///
/// A `Navigator` object can be retrieved using the read-only [window.navigator]
/// property.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/Navigator).
extension type Navigator._(JSObject _) implements JSObject {
  /// The **`getBattery()`** method provides information about the system's
  /// battery.
  /// It returns a battery promise, which resolves with a [BatteryManager]
  /// object providing some properties to get the battery status also some
  /// events you can handle to monitor the battery status.
  /// This implements the [Battery Status API]; see that documentation for
  /// additional details, a guide to using the API, and sample code.
  ///
  /// Since Chrome 103, the `Navigator.getBattery()` method of
  /// [Battery Status API] only expose to secure context.
  ///
  /// > **Note:** Access to this feature may be controlled by the  directive .
  external JSPromise<BatteryManager> getBattery();

  /// The **`navigator.sendBeacon()`**
  /// method  sends an
  /// [HTTP POST](https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/POST)
  /// request containing a small amount of data to a web server.
  ///
  /// It's intended to be used for
  /// sending analytics data to a web server, and avoids some of the problems
  /// with
  /// legacy techniques for sending analytics, such as the use of
  /// [XMLHttpRequest].
  ///
  /// > **Note:** For use cases that need the ability to send requests with
  /// > methods other than `POST`, or to change any request properties, or that
  /// > need access to the server response, instead use the
  /// > [`fetch()`](https://developer.mozilla.org/en-US/docs/Web/API/fetch)
  /// > method with
  /// > [`keepalive`](https://developer.mozilla.org/en-US/docs/Web/API/fetch#keepalive)
  /// > set to true.
  external bool sendBeacon(
    String url, [
    BodyInit? data,
  ]);

  /// The **`requestMediaKeySystemAccess()`** method of the [Navigator]
  /// interface returns a `Promise` which delivers a [MediaKeySystemAccess]
  /// object that can be used to access a particular media key system, which can
  /// in turn be used to create keys for decrypting a media stream.
  ///
  /// This method is part of the
  /// [Encrypted Media Extensions API](https://developer.mozilla.org/en-US/docs/Web/API/Encrypted_Media_Extensions_API),
  /// which brings support for encrypted media and DRM-protected video to the
  /// web.
  ///
  /// This method may have user-visible effects such as asking for permission to
  /// access one or more system resources.
  /// Consider that when deciding when to call `requestMediaKeySystemAccess()`;
  /// you don't want those requests to happen at inconvenient times.
  /// As a general rule, this function should be called only when it's about
  /// time to create and use a [MediaKeys] object by calling the returned
  /// [MediaKeySystemAccess] object's [MediaKeySystemAccess.createMediaKeys]
  /// method.
  external JSPromise<MediaKeySystemAccess> requestMediaKeySystemAccess(
    String keySystem,
    JSArray<MediaKeySystemConfiguration> supportedConfigurations,
  );

  /// The **`Navigator.getGamepads()`** method returns an array of
  /// [Gamepad] objects, one for each gamepad connected to the device.
  ///
  /// Elements in the array may be `null` if a gamepad disconnects during a
  /// session, so that the remaining gamepads retain the same index.
  external JSArray<Gamepad?> getGamepads();

  /// The **`vibrate()`** method of the [Navigator] interface pulses the
  /// vibration
  /// hardware on the device, if such hardware exists. If the device doesn't
  /// support
  /// vibration, this method has no effect. If a vibration pattern is already in
  /// progress when
  /// this method is called, the previous pattern is halted and the new one
  /// begins instead.
  ///
  /// If the method was unable to vibrate because of invalid parameters, it will
  /// return
  /// `false`, else it returns `true`. If the pattern leads to a too
  /// long vibration, it is truncated: the max length depends on the
  /// implementation.
  external bool vibrate(VibratePattern pattern);

  /// The **`share()`** method of the [Navigator] interface invokes the native
  /// sharing mechanism of the device to share data such as text, URLs, or
  /// files. The available _share targets_ depend on the device, but might
  /// include the clipboard, contacts and email applications, websites,
  /// Bluetooth, etc.
  ///
  /// The method resolves a `Promise` with `undefined`.
  /// On Windows this happens when the share popup is launched, while on Android
  /// the promise resolves once the data has successfully been passed to the
  /// _share target_.
  ///
  /// The
  /// [Web Share API](https://developer.mozilla.org/en-US/docs/Web/API/Web_Share_API)
  /// is gated by the
  /// [web-share](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Permissions-Policy/web-share)
  /// permission policy.
  /// The `share()` method will throw exceptions if the permission is supported
  /// but has not been granted.
  external JSPromise<JSAny?> share([ShareData data]);

  /// The **`canShare()`** method of the [Navigator] interface returns `true` if
  /// the equivalent call to [navigator.share] would succeed.
  ///
  /// The method returns `false` if the data cannot be _validated_. Reasons the
  /// data might be invalid include:
  ///
  /// - The `data` parameter has been omitted or only contains properties with
  ///   unknown values. Note that any properties that are not recognized by the
  ///   user agent are ignored.
  /// - A URL is badly formatted.
  /// - Files are specified but the implementation does not support file
  ///   sharing.
  /// - Sharing the specified data would be considered a "hostile share" by the
  ///   user-agent.
  ///
  /// The
  /// [Web Share API](https://developer.mozilla.org/en-US/docs/Web/API/Web_Share_API)
  /// is gated by the
  /// [web-share](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Permissions-Policy/web-share)
  /// permission policy.
  /// The `canShare()` method will return `false` if the permission is supported
  /// but has not been granted.
  external bool canShare([ShareData data]);

  /// The **`requestMIDIAccess()`** method of the [Navigator] interface returns
  /// a `Promise` representing a request for access to MIDI devices on a user's
  /// system.
  /// This method is part of the
  /// [Web MIDI API](https://developer.mozilla.org/en-US/docs/Web/API/Web_MIDI_API),
  /// which provides a means for accessing, enumerating, and manipulating MIDI
  /// devices.
  ///
  /// This method may prompt the user for access to MIDI devices available to
  /// their system, or it may use a previously established preference to grant
  /// or deny access.
  /// If permission is granted then the `Promise` resolves and a
  /// [`MIDIAccess`](https://developer.mozilla.org/en-US/docs/Web/API/MIDIAccess)
  /// object is returned.
  external JSPromise<MIDIAccess> requestMIDIAccess([MIDIOptions options]);

  /// The **`setAppBadge()`** method of the [Navigator] interface sets a badge
  /// on the icon associated with this app. If a value is passed to the method,
  /// this will be set as the value of the badge. Otherwise the badge will
  /// display as a dot, or other indicator as defined by the platform.
  external JSPromise<JSAny?> setAppBadge([int contents]);

  /// The **`clearAppBadge()`** method of the [Navigator] interface clears a
  /// badge on the current app's icon by setting it to `nothing`. The value
  /// `nothing` indicates that no badge is currently set, and the status of the
  /// badge is _cleared_.
  external JSPromise<JSAny?> clearAppBadge();

  /// The **`Navigator.taintEnabled()`** method always returns
  /// `false`.
  ///
  /// Tainting was a security method used by JavaScript 1.2. It has long been
  /// removed; this
  /// method only stays for maintaining compatibility with very old scripts.
  external bool taintEnabled();

  /// The **[Navigator]** method **`registerProtocolHandler()`** lets websites
  /// register their ability to open or handle particular URL schemes (aka
  /// protocols).
  ///
  /// For example, this API lets webmail sites open `mailto:` URLs, or VoIP
  /// sites open `tel:` URLs.
  external void registerProtocolHandler(
    String scheme,
    String url,
  );

  /// The **[Navigator]** method **`unregisterProtocolHandler()`** removes a
  /// protocol handler for a given URL [scheme](#permitted_schemes).
  ///
  /// This method is the inverse of **`registerProtocolHandler()`**.
  external void unregisterProtocolHandler(
    String scheme,
    String url,
  );

  /// This method always returns false.
  external bool javaEnabled();

  /// The **`clipboard`** read-only property of the [Navigator] interface
  /// returns a [Clipboard] object used to read and write the clipboard's
  /// contents.
  ///
  /// This is the entry point to the
  /// [Clipboard API](https://developer.mozilla.org/en-US/docs/Web/API/Clipboard_API),
  /// which can be used to implement cut, copy, and paste features within a web
  /// application.
  external Clipboard get clipboard;

  /// The **`credentials`** read-only property of the [Navigator] interface
  /// returns the [CredentialsContainer] object associated with the current
  /// document, which exposes methods to request credentials. The
  /// [CredentialsContainer] interface also notifies the user agent when an
  /// interesting event occurs, such as a successful sign-in or sign-out. This
  /// interface can be used for feature detection.
  external CredentialsContainer get credentials;

  /// The **`Navigator.geolocation`** read-only property returns a
  /// [Geolocation] object that gives Web content access to the location of the
  /// device. This allows a website or app to offer customized results based on
  /// the user's
  /// location.
  ///
  /// > **Note:** For security reasons, when a web page tries to access location
  /// > information, the user is notified and asked to grant permission. Be
  /// > aware that each
  /// > browser has its own policies and methods for requesting this permission.
  external Geolocation get geolocation;

  /// The read-only **`userActivation`** property of the [Navigator] interface
  /// returns a [UserActivation] object which contains information about the
  /// current window's user activation state.
  external UserActivation get userActivation;

  /// The **`Navigator.mediaCapabilities`** read-only property
  /// returns a [MediaCapabilities] object that can expose information about the
  /// decoding and encoding capabilities for a given format and output
  /// capabilities as defined
  /// by the
  /// [Media Capabilities API](https://developer.mozilla.org/en-US/docs/Web/API/Media_Capabilities_API).
  external MediaCapabilities get mediaCapabilities;

  /// The **`mediaDevices`** read-only property of the [Navigator] interface
  /// returns a [MediaDevices] object, which provides access to connected media
  /// input devices like cameras and microphones, as well as screen sharing.
  external MediaDevices get mediaDevices;

  /// The **`mediaSession`** read-only property of the [Navigator]
  /// interface returns a [MediaSession]
  /// object that can be used to share with the browser metadata and other
  /// information about
  /// the current playback state of media being handled by a document.
  ///
  /// This
  /// information may, in turn, be shared with the device and/or operating
  /// system in order to
  /// a device's standard media control user experience to describe and control
  /// the playback
  /// of the media.
  ///
  /// In addition, the `MediaSession` interface provides the
  /// [MediaSession.setActionHandler] method, which lets
  /// you receive events when the user engages device controls such as either
  /// onscreen or
  /// physical play, pause, seek, and other similar controls. An internet radio
  /// app, for
  /// example, can use `setActionHandler()` to let the media controls on a
  /// keyboard
  /// or elsewhere on the user's device be used to control the app's media
  /// playback.
  external MediaSession get mediaSession;

  /// The **`permissions`** read-only property of the [Navigator] interface
  /// returns a
  /// [Permissions] object that can be used to query and update permission
  /// status of APIs covered by the
  /// [Permissions API](https://developer.mozilla.org/en-US/docs/Web/API/Permissions_API).
  external Permissions get permissions;

  /// The **`maxTouchPoints`** read-only property of the
  /// [Navigator] interface returns the maximum number of simultaneous touch
  /// contact points are supported by the current device.
  external int get maxTouchPoints;

  /// The `presentation` read-only property of [Navigator] serves as the entry
  /// point for the
  /// [Presentation API](https://developer.mozilla.org/en-US/docs/Web/API/Presentation_API)
  /// and
  /// returns a reference to [Presentation] object.
  external JSObject get presentation;

  /// The **`wakeLock`** read-only property of the [Navigator] interface returns
  /// a [WakeLock] interface that allows a document to acquire a screen wake
  /// lock.
  /// While a screen wake lock is active, the user agent will try to prevent the
  /// device from dimming the screen, turning it off completely, or showing a
  /// screensaver.
  external WakeLock get wakeLock;

  /// The **`serviceWorker`** read-only property of the [Navigator] interface
  /// returns the [ServiceWorkerContainer] object for the
  /// [associated document](https://html.spec.whatwg.org/multipage/browsers.html#concept-document-window),
  /// which provides access to registration, removal, upgrade, and communication
  /// with the [ServiceWorker].
  ///
  /// The feature may not be available in private mode.
  external ServiceWorkerContainer get serviceWorker;

  /// The **`usb`** read-only property of the [Navigator] interface returns a
  /// [USB] object for the current document, providing access to
  /// [WebUSB API](https://developer.mozilla.org/en-US/docs/Web/API/WebUSB_API)
  /// functionality.
  external JSObject get usb;

  /// The **`windowControlsOverlay`** read-only property of the [Navigator]
  /// interface returns the [WindowControlsOverlay] interface, which exposes
  /// information about the title bar geometry in desktop Progressive Web Apps
  /// that use the
  /// [Window Controls Overlay API](https://developer.mozilla.org/en-US/docs/Web/API/Window_Controls_Overlay_API).
  ///
  /// Progressive Web Apps installed on desktop Operating Systems can opt-in to
  /// the
  /// Window Controls Overlay feature by using the `window-controls-overlay`
  /// value in the
  /// [`display_override`](https://developer.mozilla.org/en-US/docs/Web/Manifest/display_override)
  /// web app manifest member.
  ///
  /// Doing so hides the default window title bar and gives the app access to
  /// the full area
  /// of the app window.
  external JSObject get windowControlsOverlay;

  /// The **`deviceMemory`** read-only
  /// property of the [Navigator] interface returns the approximate amount of
  /// device memory in gigabytes.
  ///
  /// The reported value is imprecise to curtail . It's approximated by
  /// rounding down to the nearest power of 2, then dividing that number by
  /// 1024. It is then
  /// clamped within lower and upper bounds to protect the privacy of owners of
  /// very low-memory or
  /// high-memory devices.
  external double get deviceMemory;

  /// The value of the **`Navigator.appCodeName`** property is
  /// always "`Mozilla`", in any browser. This property is kept only for
  /// compatibility purposes.
  ///
  /// > **Note:** Do not rely on this property to return a real
  /// > product name. All browsers return "`Mozilla`" as the value of this
  /// > property.
  external String get appCodeName;

  /// The value of the **`Navigator.appName`** property is always
  /// "`Netscape`", in any browser. This property is kept only for compatibility
  /// purposes.
  ///
  /// > **Note:** Do not rely on this property to return a real browser name.
  /// > All browsers return "`Netscape`" as the value of this property.
  external String get appName;

  /// Returns either "`4.0`" or a string representing version information about
  /// the browser.
  ///
  /// > **Note:** Do not rely on this property to return the correct browser
  /// > version.
  external String get appVersion;

  /// The **`platform`** property read-only property of the [Navigator]
  /// interface returns a string identifying the platform on which the user's
  /// browser is running.
  ///
  /// > **Note:** In general, you should whenever possible avoid writing code
  /// > that uses methods or properties like this one to try to find out
  /// > information about the user's environment, and instead write code that
  /// > does
  /// > [feature detection](https://developer.mozilla.org/en-US/docs/Learn/Tools_and_testing/Cross_browser_testing/Feature_detection).
  external String get platform;

  /// The value of the **`Navigator.product`** property is always
  /// "`Gecko`", in any browser. This property is kept only for compatibility
  /// purposes.
  ///
  /// > **Note:** Do not rely on this property to return a real product name.
  /// > All browsers return "`Gecko`" as the value of this property.
  external String get product;

  /// The **`Navigator.productSub`** read-only property that returns either the
  /// string "20030107", or the string "20100101".
  external String get productSub;

  /// The **`Navigator.userAgent`** read-only property returns the
  /// user agent string for the current browser.
  ///
  /// > **Note:** The specification asks browsers to provide as little
  /// > information via this field as
  /// > possible. Never assume that the value of this property will stay the
  /// > same in future
  /// > versions of the same browser. Try not to use it at all, or only for
  /// > current and past
  /// > versions of a browser. New browsers may start using the same UA, or part
  /// > of it, as an
  /// > older browser: you really have no guarantee that the browser agent is
  /// > indeed the one
  /// > advertised by this property.
  /// >
  /// > Also keep in mind that users of a browser can change the value of this
  /// > field if they
  /// > want (UA spoofing).
  ///
  /// Browser identification based on detecting the user agent string is
  /// **unreliable** and **is not recommended**, as the user agent
  /// string is user configurable. For example:
  ///
  /// - In Firefox, you can change the preference `general.useragent.override`
  ///   in
  /// `about:config`. Some Firefox extensions do that; however, this only
  /// changes
  /// the HTTP header that gets sent and that is returned by
  /// `navigator.userAgent`.
  /// There might be other methods that utilize JavaScript code to identify the
  /// browser.
  /// - Opera 6+ allows users to set the browser identification string via a
  ///   menu.
  external String get userAgent;

  /// The value of the [Navigator] **`vendor`** property is always either
  /// "`Google Inc.`", "`Apple Computer, Inc.`", or (in Firefox) the empty
  /// string.
  external String get vendor;

  /// The value of the **`Navigator.vendorSub`** property is always
  /// the empty string, in any browser.
  external String get vendorSub;

  /// The **`Navigator.oscpu`** property returns a string that identifies the
  /// current operating system.
  external String get oscpu;

  /// The **`Navigator.language`** read-only property returns a string
  /// representing the preferred language of the user, usually the language of
  /// the browser UI.
  external String get language;

  /// The **`Navigator.languages`** read-only property
  /// returns an array of strings representing the user's preferred
  /// languages. The language is described using language tags according to
  /// `5646, "Tags for Identifying Languages (also known as BCP 47)"`. In the
  /// returned
  /// array they are ordered by preference with the most preferred language
  /// first.
  ///
  /// The value of [Navigator.language] is the
  /// first element of the returned array.
  ///
  /// When its value changes, as the user's preferred languages are changed a
  /// [Window.languagechange_event] event is fired on the [Window] object.
  ///
  /// The  HTTP header in every HTTP request from the user's browser generally
  /// lists the same locales as the `navigator.languages` property, with
  /// decreasing `q` values (quality values). Some browsers (Chrome and Safari)
  /// add language-only fallback tags in `Accept-Language`—for example,
  /// `en-US,en;q=0.9,zh-CN;q=0.8,zh;q=0.7` when `navigator.languages` is
  /// `["en-US", "zh-CN"]`. For privacy purposes (reducing ), both
  /// `Accept-Language` and `navigator.languages` may not include the full list
  /// of user preferences, such as in Safari (always) and Chrome's incognito
  /// mode, where only one language is listed.
  external JSArray<JSString> get languages;

  /// Returns the online status of the browser. The property returns a boolean
  /// value, with
  /// `true` meaning online and `false` meaning offline. The property
  /// sends updates whenever the browser's ability to connect to the network
  /// changes. The
  /// update occurs when the user follows links or when a script requests a
  /// remote page. For
  /// example, the property should return `false` when users click links soon
  /// after
  /// they lose internet connection.
  ///
  /// Browsers implement this property differently.
  ///
  /// In Chrome and Safari, if the browser is not able to connect to a local
  /// area network
  /// (LAN) or a router, it is offline; all other conditions return `true`. So
  /// while you can assume that the browser is offline when it returns a `false`
  /// value, you cannot assume that a true value necessarily means that the
  /// browser can access
  /// the internet. You could be getting false positives, such as in cases where
  /// the computer
  /// is running a virtualization software that has virtual ethernet adapters
  /// that are always
  /// "connected." Therefore, if you really want to determine the online status
  /// of the
  /// browser, you should develop additional means for checking.
  ///
  /// In Firefox, switching the browser to offline mode sends a `false` value.
  /// Until Firefox
  /// 41, all other conditions returned a `true` value; testing actual behavior
  /// on Nightly 68 on
  /// Windows shows that it only looks for LAN connection like Chrome and Safari
  /// giving false
  /// positives.
  ///
  /// You can see changes in the network state by listening to the
  /// [`online`](https://developer.mozilla.org/en-US/docs/Web/API/Window/online_event)
  /// and
  /// [`offline`](https://developer.mozilla.org/en-US/docs/Web/API/Window/offline_event)
  /// events.
  external bool get onLine;

  /// `navigator.cookieEnabled` returns a Boolean value that indicates whether
  /// cookies are enabled or not.
  ///
  /// The property is read-only.
  external bool get cookieEnabled;

  /// Returns a [PluginArray] object, listing the [Plugin] objects describing
  /// the plugins installed in the application.
  /// Named properties of the returned object are not enumerable (except in very
  /// old browser versions).
  ///
  /// Recent versions of the specification hard-code the returned list.
  /// If inline viewing of PDF files is supported the property lists five
  /// standard plugins.
  /// If inline PDF viewing is not supported then an empty list is returned.
  ///
  /// > **Note:** Use [Navigator.pdfViewerEnabled] to determine if inline
  /// > viewing of PDF files is supported. Do not infer it from this property.
  /// >
  /// > The "five standard plugins" are those that developers have most commonly
  /// > used to feature detect inline PDF viewing.
  /// > Returning these ensures that legacy code can more reliably determine
  /// > whether inline viewing is supported.
  /// > However this approach is not recommended for new code because this
  /// > property may eventually be removed.
  ///
  /// Legacy browser versions also list plugins for Adobe Flash and PDF viewer
  /// extensions.
  external PluginArray get plugins;

  /// Returns a [MimeTypeArray] object, which contains a list of [MimeType]
  /// objects representing the MIME types recognized and supported by the
  /// browser.
  /// The array can be queried for information about the enabled plugin that is
  /// used to handle a file of the specified type.
  /// Named properties of the returned object are not enumerable (except in very
  /// old browser versions).
  ///
  /// Recent versions of the specification hard-code the returned set of MIME
  /// types.
  /// If PDF files can be displayed inline then `application/pdf` and `text/pdf`
  /// are listed.
  /// Otherwise an empty list is returned.
  ///
  /// > **Note:** Use [Navigator.pdfViewerEnabled] to determine if inline
  /// > viewing of PDF files is supported. Do not infer it from this property.
  ///
  /// Legacy browser versions do not hard-code the list returned by the
  /// property, and might return other MIME types.
  external MimeTypeArray get mimeTypes;

  /// The **`pdfViewerEnabled`** read-only property of the [Navigator] interface
  /// indicates whether the browser supports inline display of PDF files when
  /// navigating to them.
  ///
  /// If inline viewing is not supported the PDF is downloaded and may then be
  /// handled by some external application.
  ///
  /// > **Note:** This method replaces a number of legacy methods of inferring
  /// > support for inline viewing of PDF files.
  external bool get pdfViewerEnabled;

  /// The **`navigator.hardwareConcurrency`** read-only property
  /// returns the number of logical processors available to run threads on the
  /// user's
  /// computer.
  external int get hardwareConcurrency;

  /// The **`connection`** read-only property of the [Navigator] interface
  /// returns a [NetworkInformation] object containing information about the
  /// system's connection, such as the current bandwidth of the user's device or
  /// whether the connection is metered.
  ///
  /// This could be used to select high definition content or low definition
  /// content based on the user's connection.
  external NetworkInformation get connection;

  /// The **`Navigator.storage`**
  /// read-only property returns the singleton [StorageManager] object used to
  /// access the overall storage capabilities of the browser for the current
  /// site or app.
  /// The returned object lets you examine and configure persistence of data
  /// stores and
  /// learn approximately how much more space your browser has available for
  /// local storage
  /// use.
  external StorageManager get storage;

  /// The **`locks`** read-only property of
  /// the [Navigator] interface returns a [LockManager] object
  /// which provides methods for requesting a new [Lock] object and querying
  /// for an existing `Lock` object.
  external LockManager get locks;

  /// The **`webdriver`** read-only property
  /// of the [navigator] interface indicates whether the user agent is
  /// controlled by automation.
  ///
  /// It defines a standard way for co-operating user agents to inform the
  /// document that it
  /// is controlled by
  /// [WebDriver](https://developer.mozilla.org/en-US/docs/Web/WebDriver), for
  /// example, so that
  /// alternate code paths can be triggered during automation.
  ///
  /// The `navigator.webdriver` property is true when in:
  ///
  /// - Chrome
  ///   - : The `--enable-automation` or the `--headless` flag or the
  /// `--remote-debugging-port` is used.
  /// - Firefox
  ///   - : The `marionette.enabled` preference or `--marionette` flag is
  /// passed.
  external bool get webdriver;
}

/// The `PluginArray` interface is used to store a list of [Plugin] objects
/// describing the available
/// [plugins](https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/Plugins);
/// it's returned by the [Navigator.plugins] property. The `PluginArray` is not
/// a JavaScript array, but has the `length` property and supports accessing
/// individual items using bracket notation (`plugins[2]`), as well as via
/// `item(index)` and `namedItem("name")` methods.
///
/// > **Note:** Own properties of `PluginArray` objects are no longer enumerable
/// > in the latest browser versions.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/PluginArray).
extension type PluginArray._(JSObject _) implements JSObject {
  external void refresh();
  external Plugin? item(int index);
  external Plugin? namedItem(String name);
  external int get length;
}

/// The **`MimeTypeArray`** interface returns an array of [MimeType] instances,
/// each of which contains information about a supported browser plugins. This
/// object is returned by the deprecated [Navigator.mimeTypes] property.
///
/// This interface was an
/// [attempt to create an unmodifiable list](https://stackoverflow.com/questions/74630989/why-use-domstringlist-rather-than-an-array/74641156#74641156)
/// and only continues to be supported to not break code that's already using
/// it. Modern APIs represent list structures using types based on JavaScript
/// [arrays](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array),
/// thus making many array methods available, and at the same time imposing
/// additional semantics on their usage (such as making their items read-only).
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/MimeTypeArray).
extension type MimeTypeArray._(JSObject _) implements JSObject {
  external MimeType? item(int index);
  external MimeType? namedItem(String name);
  external int get length;
}

/// The `Plugin` interface provides information about a browser plugin.
///
/// > **Note:** Own properties of `Plugin` objects are no longer enumerable in
/// > the latest browser versions.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/Plugin).
extension type Plugin._(JSObject _) implements JSObject {
  external MimeType? item(int index);
  external MimeType? namedItem(String name);
  external String get name;
  external String get description;
  external String get filename;
  external int get length;
}

/// The **`MimeType`** interface provides contains information about a MIME type
/// associated with a particular plugin. [Navigator.mimeTypes] returns an array
/// of this object.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/MimeType).
extension type MimeType._(JSObject _) implements JSObject {
  external String get type;
  external String get description;
  external String get suffixes;
  external Plugin get enabledPlugin;
}

/// The **`ImageBitmap`** interface represents a bitmap image which can be drawn
/// to a `canvas` without undue latency. It can be created from a variety of
/// source objects using the [createImageBitmap] factory method. `ImageBitmap`
/// provides an asynchronous and resource efficient pathway to prepare textures
/// for rendering in WebGL.
///
/// `ImageBitmap` is a
/// [transferable object](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Transferable_objects).
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/ImageBitmap).
extension type ImageBitmap._(JSObject _) implements JSObject {
  /// The **`ImageBitmap.close()`**
  /// method disposes of all graphical resources associated with an
  /// `ImageBitmap`.
  external void close();

  /// The read-only **`ImageBitmap.width`** property returns the [ImageBitmap]
  /// object's width in CSS pixels.
  external int get width;

  /// The read-only **`ImageBitmap.height`** property returns the [ImageBitmap]
  /// object's height in CSS pixels.
  external int get height;
}
extension type ImageBitmapOptions._(JSObject _) implements JSObject {
  external factory ImageBitmapOptions({
    ImageOrientation imageOrientation,
    PremultiplyAlpha premultiplyAlpha,
    ColorSpaceConversion colorSpaceConversion,
    int resizeWidth,
    int resizeHeight,
    ResizeQuality resizeQuality,
  });

  external ImageOrientation get imageOrientation;
  external set imageOrientation(ImageOrientation value);
  external PremultiplyAlpha get premultiplyAlpha;
  external set premultiplyAlpha(PremultiplyAlpha value);
  external ColorSpaceConversion get colorSpaceConversion;
  external set colorSpaceConversion(ColorSpaceConversion value);
  external int get resizeWidth;
  external set resizeWidth(int value);
  external int get resizeHeight;
  external set resizeHeight(int value);
  external ResizeQuality get resizeQuality;
  external set resizeQuality(ResizeQuality value);
}

/// The **`MessageEvent`** interface represents a message received by a target
/// object.
///
/// This is used to represent messages in:
///
/// - [Server-sent events](https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events)
///   (see [EventSource.message_event]).
/// - [Web sockets](https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API)
///   (see the `onmessage` property of the
///   [WebSocket](https://developer.mozilla.org/en-US/docs/Web/API/WebSocket)
///   interface).
/// - Cross-document messaging (see [Window.postMessage] and
///   [Window.message_event]).
/// - [Channel messaging](https://developer.mozilla.org/en-US/docs/Web/API/Channel_Messaging_API)
///   (see [MessagePort.postMessage] and [MessagePort.message_event]).
/// - Cross-worker/document messaging (see the above two entries, but also
///   [Worker.postMessage], [Worker.message_event],
///   [ServiceWorkerGlobalScope.message_event], etc.)
/// - [Broadcast channels](https://developer.mozilla.org/en-US/docs/Web/API/Broadcast_Channel_API)
///   (see [BroadcastChannel.postMessage]) and
///   [BroadcastChannel.message_event]).
/// - WebRTC data channels (see [RTCDataChannel.message_event]).
///
/// The action triggered by this event is defined in a function set as the event
/// handler for the relevant `message` event (e.g. using an `onmessage` handler
/// as listed above).
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/MessageEvent).
extension type MessageEvent._(JSObject _) implements Event, JSObject {
  external factory MessageEvent(
    String type, [
    MessageEventInit eventInitDict,
  ]);

  external void initMessageEvent(
    String type, [
    bool bubbles,
    bool cancelable,
    JSAny? data,
    String origin,
    String lastEventId,
    MessageEventSource? source,
    JSArray<MessagePort> ports,
  ]);

  /// The **`data`** read-only property of the
  /// [MessageEvent] interface represents the data sent by the message emitter.
  external JSAny? get data;

  /// The **`origin`** read-only property of the
  /// [MessageEvent] interface is a string representing the
  /// origin of the message emitter.
  external String get origin;

  /// The **`lastEventId`** read-only property of the
  /// [MessageEvent] interface is a string representing a
  /// unique ID for the event.
  external String get lastEventId;

  /// The **`source`** read-only property of the
  /// [MessageEvent] interface is a `MessageEventSource` (which can be
  /// a , [MessagePort], or
  /// [ServiceWorker] object) representing the message emitter.
  external MessageEventSource? get source;

  /// The **`ports`** read-only property of the
  /// [MessageEvent] interface is an array of [MessagePort] objects
  /// representing the ports associated with the channel the message is being
  /// sent through
  /// (where appropriate, e.g. in channel messaging or when sending a message to
  /// a shared
  /// worker).
  external JSArray<MessagePort> get ports;
}
extension type MessageEventInit._(JSObject _) implements EventInit, JSObject {
  external factory MessageEventInit({
    bool bubbles,
    bool cancelable,
    bool composed,
    JSAny? data,
    String origin,
    String lastEventId,
    MessageEventSource? source,
    JSArray<MessagePort> ports,
  });

  external JSAny? get data;
  external set data(JSAny? value);
  external String get origin;
  external set origin(String value);
  external String get lastEventId;
  external set lastEventId(String value);
  external MessageEventSource? get source;
  external set source(MessageEventSource? value);
  external JSArray<MessagePort> get ports;
  external set ports(JSArray<MessagePort> value);
}

/// The **`EventSource`** interface is web content's interface to
/// [server-sent events](https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events).
///
/// An `EventSource` instance opens a persistent connection to an
/// [HTTP](https://developer.mozilla.org/en-US/docs/Web/HTTP) server, which
/// sends
/// [events](https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Building_blocks/Events)
/// in `text/event-stream` format. The connection remains open until closed by
/// calling [EventSource.close].
///
/// Once the connection is opened, incoming messages from the server are
/// delivered to your code in the form of events. If there is an event field in
/// the incoming message, the triggered event is the same as the event field
/// value. If no event field is present, then a generic
/// [EventSource.message_event] event is fired.
///
/// Unlike
/// [WebSockets](https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API),
/// server-sent events are unidirectional; that is, data messages are delivered
/// in one direction, from the server to the client (such as a user's web
/// browser). That makes them an excellent choice when there's no need to send
/// data from the client to the server in message form. For example,
/// `EventSource` is a useful approach for handling things like social media
/// status updates, news feeds, or delivering data into a
/// [client-side storage](https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Client-side_web_APIs/Client-side_storage)
/// mechanism like
/// [IndexedDB](https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API)
/// or
/// [web storage](https://developer.mozilla.org/en-US/docs/Web/API/Web_Storage_API).
///
/// > **Warning:** When **not used over HTTP/2**, SSE suffers from a limitation
/// > to the maximum number of open connections, which can be specially painful
/// > when opening various tabs as the limit is _per browser_ and set to a very
/// > low number (6). The issue has been marked as "Won't fix" in
/// > [Chrome](https://crbug.com/275955) and
/// > [Firefox](https://bugzil.la/906896). This limit is per browser + domain,
/// > so that means that you can open 6 SSE connections across all of the tabs
/// > to `www.example1.com` and another 6 SSE connections to `www.example2.com`.
/// > (from
/// > [Stackoverflow](https://stackoverflow.com/questions/5195452/websockets-vs-server-sent-events-eventsource/5326159)).
/// > When using HTTP/2, the maximum number of simultaneous _HTTP streams_ is
/// > negotiated between the server and the client (defaults to 100).
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/EventSource).
extension type EventSource._(JSObject _) implements EventTarget, JSObject {
  external factory EventSource(
    String url, [
    EventSourceInit eventSourceInitDict,
  ]);

  static const int CONNECTING = 0;

  static const int OPEN = 1;

  static const int CLOSED = 2;

  /// The **`close()`** method of the [EventSource]
  /// interface closes the connection, if one is made, and sets the
  /// [EventSource.readyState] attribute to `2` (closed).
  ///
  /// > **Note:** If the connection is already closed, the method does nothing.
  external void close();

  /// The **`url`** read-only property of the
  /// [EventSource] interface returns a string representing the
  /// URL of the source.
  external String get url;

  /// The **`withCredentials`** read-only property of the
  /// [EventSource] interface returns a boolean value indicating whether
  /// the `EventSource` object was instantiated with CORS credentials set.
  external bool get withCredentials;

  /// The **`readyState`** read-only property of the
  /// [EventSource] interface returns a number representing the state of the
  /// connection.
  external int get readyState;
  external EventHandler get onopen;
  external set onopen(EventHandler value);
  external EventHandler get onmessage;
  external set onmessage(EventHandler value);
  external EventHandler get onerror;
  external set onerror(EventHandler value);
}
extension type EventSourceInit._(JSObject _) implements JSObject {
  external factory EventSourceInit({bool withCredentials});

  external bool get withCredentials;
  external set withCredentials(bool value);
}

/// The **`MessageChannel`** interface of the
/// [Channel Messaging API](https://developer.mozilla.org/en-US/docs/Web/API/Channel_Messaging_API)
/// allows us to create a new message channel and send data through it via its
/// two [MessagePort] properties.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/MessageChannel).
extension type MessageChannel._(JSObject _) implements JSObject {
  external factory MessageChannel();

  /// The **`port1`** read-only property of the
  /// [MessageChannel] interface returns the first port of the message channel —
  /// the port attached to the context that originated the channel.
  external MessagePort get port1;

  /// The **`port2`** read-only property of the
  /// [MessageChannel] interface returns the second port of the message channel
  /// —
  /// the port attached to the context at the other end of the channel, which
  /// the message is
  /// initially sent to.
  external MessagePort get port2;
}

/// The **`MessagePort`** interface of the
/// [Channel Messaging API](https://developer.mozilla.org/en-US/docs/Web/API/Channel_Messaging_API)
/// represents one of the two ports of a [MessageChannel], allowing messages to
/// be sent from one port and listening out for them arriving at the other.
///
/// `MessagePort` is a
/// [transferable object](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Transferable_objects).
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/MessagePort).
extension type MessagePort._(JSObject _) implements EventTarget, JSObject {
  /// The **`postMessage()`** method of the
  /// [MessagePort] interface sends a message from the port, and optionally,
  /// transfers ownership of objects to other browsing contexts.
  external void postMessage(
    JSAny? message, [
    JSObject optionsOrTransfer,
  ]);

  /// The **`start()`** method of the [MessagePort]
  /// interface starts the sending of messages queued on the port. This method
  /// is only needed
  /// when using [EventTarget.addEventListener]; it is implied when using
  /// [MessagePort.message_event].
  external void start();

  /// The **`close()`** method of the [MessagePort]
  /// interface disconnects the port, so it is no longer active. This stops the
  /// flow of
  /// messages to that port.
  external void close();
  external EventHandler get onmessage;
  external set onmessage(EventHandler value);
  external EventHandler get onmessageerror;
  external set onmessageerror(EventHandler value);
  external EventHandler get onclose;
  external set onclose(EventHandler value);
}
extension type StructuredSerializeOptions._(JSObject _) implements JSObject {
  external factory StructuredSerializeOptions({JSArray<JSObject> transfer});

  external JSArray<JSObject> get transfer;
  external set transfer(JSArray<JSObject> value);
}

/// The **`BroadcastChannel`** interface represents a named channel that any  of
/// a given  can subscribe to. It allows communication between different
/// documents (in different windows, tabs, frames or iframes) of the same
/// origin. Messages are broadcasted via a [BroadcastChannel.message_event]
/// event fired at all `BroadcastChannel` objects listening to the channel,
/// except the object that sent the message.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/BroadcastChannel).
extension type BroadcastChannel._(JSObject _) implements EventTarget, JSObject {
  external factory BroadcastChannel(String name);

  /// The **`postMessage()`** method of the [BroadcastChannel] interface sends a
  /// message,
  /// which can be of any kind of `Object`,
  /// to each listener in any  with the same .
  /// The message is transmitted as a [BroadcastChannel.message_event] event
  /// targeted at each [BroadcastChannel] bound to the channel.
  external void postMessage(JSAny? message);

  /// The **`close()`** method of the [BroadcastChannel] interface terminates
  /// the connection to
  /// the underlying channel, allowing the object to be garbage collected.
  /// This is a necessary step to perform
  /// as there is no other way for a browser to know
  /// that this channel is not needed anymore.
  external void close();

  /// The **`name`** read-only property of the [BroadcastChannel] interface
  /// returns a string, which uniquely identifies the given channel with its
  /// name. This name is passed to the [BroadcastChannel.BroadCastChannel]
  /// constructor at creation time and is therefore read-only.
  external String get name;
  external EventHandler get onmessage;
  external set onmessage(EventHandler value);
  external EventHandler get onmessageerror;
  external set onmessageerror(EventHandler value);
}

/// The **`WorkerGlobalScope`** interface of the
/// [Web Workers API](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API)
/// is an interface representing the scope of any worker. Workers have no
/// browsing context; this scope contains the information usually conveyed by
/// [Window] objects — in this case event handlers, the console or the
/// associated [WorkerNavigator] object. Each `WorkerGlobalScope` has its own
/// event loop.
///
/// This interface is usually specialized by each worker type:
/// [DedicatedWorkerGlobalScope] for dedicated workers,
/// [SharedWorkerGlobalScope] for shared workers, and [ServiceWorkerGlobalScope]
/// for
/// [ServiceWorker](https://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API).
/// The `self` property returns the specialized scope for each context.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/WorkerGlobalScope).
extension type WorkerGlobalScope._(JSObject _)
    implements EventTarget, JSObject {
  /// The **`importScripts()`** method of the [WorkerGlobalScope] interface
  /// synchronously imports one or more scripts into the worker's scope.
  external void importScripts(JSAny urls);
  external void reportError(JSAny? e);

  /// The **`btoa()`** method of the [WorkerGlobalScope] interface creates a
  /// -encoded  string from a _binary string_ (i.e., a
  /// string in which each character in the string is treated as a byte
  /// of binary data).
  ///
  /// You can use this method to encode data which may otherwise cause
  /// communication
  /// problems, transmit it, then use the [WorkerGlobalScope.atob] method to
  /// decode the data again.
  /// For example, you can encode control characters such as ASCII values 0
  /// through 31.
  external String btoa(String data);

  /// The **`atob()`** method of the [WorkerGlobalScope] interface decodes a
  /// string of data which has been encoded using  encoding. You can use
  /// the [WorkerGlobalScope.btoa] method to encode and transmit
  /// data which may otherwise cause communication problems, then transmit it
  /// and use the
  /// `atob()` method to decode the data again. For example, you can encode,
  /// transmit, and decode control characters such as  values 0 through 31.
  ///
  /// For use with arbitrary Unicode strings, see _The "Unicode Problem"_
  /// section in  glossary entry.
  external String atob(String data);
  external int setTimeout(
    TimerHandler handler,
    JSAny? arguments, [
    int timeout,
  ]);
  external void clearTimeout([int id]);
  external int setInterval(
    TimerHandler handler,
    JSAny? arguments, [
    int timeout,
  ]);
  external void clearInterval([int id]);
  external void queueMicrotask(VoidFunction callback);
  external JSPromise<ImageBitmap> createImageBitmap(
    ImageBitmapSource image, [
    JSAny optionsOrSx,
    int sy,
    int sw,
    int sh,
    ImageBitmapOptions options,
  ]);
  external JSAny? structuredClone(
    JSAny? value, [
    StructuredSerializeOptions options,
  ]);
  external JSPromise<Response> fetch(
    RequestInfo input, [
    RequestInit init,
  ]);

  /// The **`self`** read-only property of the [WorkerGlobalScope] interface
  /// returns a reference to the `WorkerGlobalScope` itself. Most of the time it
  /// is a specific scope like [DedicatedWorkerGlobalScope],
  /// [SharedWorkerGlobalScope], or [ServiceWorkerGlobalScope].
  external WorkerGlobalScope get self;

  /// The **`location`** read-only property of the [WorkerGlobalScope] interface
  /// returns the [WorkerLocation] associated with the worker. It is a specific
  /// location object, mostly a subset of the [Location] for browsing scopes,
  /// but adapted to workers.
  external WorkerLocation get location;

  /// The **`navigator`** read-only property of the [WorkerGlobalScope]
  /// interface returns the [WorkerNavigator] associated with the worker. It is
  /// a specific navigator object, mostly a subset of the [Navigator] for
  /// browsing scopes, but adapted to workers.
  external WorkerNavigator get navigator;
  external OnErrorEventHandler get onerror;
  external set onerror(OnErrorEventHandler value);
  external EventHandler get onlanguagechange;
  external set onlanguagechange(EventHandler value);
  external EventHandler get onoffline;
  external set onoffline(EventHandler value);
  external EventHandler get ononline;
  external set ononline(EventHandler value);
  external EventHandler get onrejectionhandled;
  external set onrejectionhandled(EventHandler value);
  external EventHandler get onunhandledrejection;
  external set onunhandledrejection(EventHandler value);

  /// The **`fonts`** property of the [WorkerGlobalScope] interface returns the
  /// [FontFaceSet] interface of the worker.
  ///
  /// This property is part of the
  /// [CSS Font Loading API](https://developer.mozilla.org/en-US/docs/Web/API/CSS_Font_Loading_API).
  external FontFaceSet get fonts;

  /// The **`origin`** read-only property of the [WorkerGlobalScope] interface
  /// returns the origin of the global scope, serialized as a string.
  external String get origin;

  /// The **`isSecureContext`** read-only property of the [WorkerGlobalScope]
  /// interface returns a boolean indicating whether the current
  /// [context is secure](https://developer.mozilla.org/en-US/docs/Web/Security/Secure_Contexts)
  /// (`true`) or not (`false`).
  external bool get isSecureContext;

  /// The **`crossOriginIsolated`** read-only property of the
  /// [WorkerGlobalScope] interface returns a boolean value that
  /// indicates whether the website is in a cross-origin isolation state. That
  /// state mitigates the risk of side-channel attacks and unlocks a few
  /// capabilities:
  ///
  /// - `SharedArrayBuffer` can be created and sent via a
  ///   [DedicatedWorkerGlobalScope.postMessage] or a [MessagePort.postMessage]
  ///   call.
  /// - [Performance.now] offers better precision.
  /// - [Performance.measureUserAgentSpecificMemory] can be accessed.
  ///
  /// A website is in a cross-origin isolated state, when the response header
  /// has the value `same-origin` and the  header has the value `require-corp`
  /// or `credentialless`.
  external bool get crossOriginIsolated;

  /// The **`indexedDB`** read-only property of the [WorkerGlobalScope]
  /// interface provides a mechanism for workers to
  /// asynchronously access the capabilities of indexed databases.
  external IDBFactory get indexedDB;

  /// The **`crypto`** read-only property of the [WorkerGlobalScope] interface
  /// returns the [Crypto] object for this worker. This object gives workers
  /// access to certain cryptographic related services.
  ///
  /// Although the property itself is read-only, all of its methods (and the
  /// methods of its
  /// child object, [SubtleCrypto]) are not read-only, and therefore vulnerable
  /// to attack by .
  ///
  /// Although `crypto` is available on all workers, the returned `Crypto`
  /// object only has one usable feature in insecure contexts: the
  /// [Crypto.getRandomValues] method. In general, you should use this API only
  /// in secure contexts.
  external Crypto get crypto;

  /// The **`performance`** property of the [WorkerGlobalScope] interface
  /// returns a [Performance] object, which can be used to gather performance
  /// information about code running in the worker's scope.
  ///
  /// Performance entries are per context. If you create a mark on a worker
  /// thread, you will not see it in the main thread or any other workers.
  ///
  /// Note that only the following performance interfaces are available in
  /// worker contexts:
  ///
  /// - [Performance]
  /// - [PerformanceEntry]
  /// - [PerformanceMark]
  /// - [PerformanceMeasure]
  /// - [PerformanceObserver]
  /// - [PerformanceObserverEntryList]
  /// - [PerformanceResourceTiming]
  /// - [PerformanceServerTiming]
  external Performance get performance;

  /// The **`scheduler`** read-only property of the [WorkerGlobalScope]
  /// interface is the entry point for using the
  /// [Prioritized Task Scheduling API](https://developer.mozilla.org/en-US/docs/Web/API/Prioritized_Task_Scheduling_API).
  ///
  /// The object has a single instance method [Scheduler.postTask] that is used
  /// to post prioritized tasks for scheduling.
  external Scheduler get scheduler;

  /// The **`caches`** read-only property of the [WorkerGlobalScope] interface
  /// returns the [CacheStorage] object associated with the current context.
  /// This object enables functionality such as storing assets for offline use,
  /// and generating custom responses to requests.
  external CacheStorage get caches;

  /// The **`trustedTypes`** read-only property of the [WorkerGlobalScope]
  /// interface returns the [TrustedTypePolicyFactory] object associated with
  /// the global object, providing the entry point for using the
  /// [Trusted Types API].
  external TrustedTypePolicyFactory get trustedTypes;
}

/// @AvailableInWorkers("dedicated")
///
/// The **`DedicatedWorkerGlobalScope`** object (the [Worker] global scope) is
/// accessible through the [WorkerGlobalScope.self] keyword. Some additional
/// global functions, namespaces objects, and constructors, not typically
/// associated with the worker global scope, but available on it, are listed in
/// the
/// [JavaScript Reference](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference).
/// See also:
/// [Functions available to workers](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Functions_and_classes_available_to_workers).
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/DedicatedWorkerGlobalScope).
extension type DedicatedWorkerGlobalScope._(JSObject _)
    implements WorkerGlobalScope, JSObject {
  /// @AvailableInWorkers("dedicated")
  ///
  /// The **`postMessage()`** method of the [DedicatedWorkerGlobalScope]
  /// interface sends a message to the main thread that spawned it.
  ///
  /// This accepts a data parameter, which contains data to copy from the worker
  /// to the main thread.
  /// The data may be any value or JavaScript object handled by the
  /// [structured clone](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Structured_clone_algorithm)
  /// algorithm, which includes cyclical references.
  ///
  /// The method also accepts an optional array of
  /// [transferable objects](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Transferable_objects)
  /// to _transfer_ to the main thread;
  /// Unlike the data parameter transferred objects are no longer usable in the
  /// worker thread.
  /// (Where possible, objects are transferred using a high performance
  /// zero-copy operation).
  ///
  /// The main scope that spawned the worker can send back information to the
  /// thread that spawned it using the [Worker.postMessage] method.
  external void postMessage(
    JSAny? message, [
    JSObject optionsOrTransfer,
  ]);

  /// @AvailableInWorkers("dedicated")
  ///
  /// The **`close()`** method of the [DedicatedWorkerGlobalScope] interface
  /// discards any tasks queued in the `DedicatedWorkerGlobalScope`'s event
  /// loop, effectively closing this particular scope.
  external void close();

  /// @AvailableInWorkers("dedicated")
  ///
  /// The **`requestAnimationFrame()`** method of the
  /// [DedicatedWorkerGlobalScope] interface tells the browser you wish to
  /// perform an animation frame request and call a user-supplied callback
  /// function before the next repaint.
  ///
  /// The frequency of calls to the callback function will generally match the
  /// display refresh rate. The most common refresh rate is 60 Hz, (60
  /// cycles/frames per second), though 75 Hz, 120 Hz, and 144 Hz are also
  /// widely used. `requestAnimationFrame()` calls are paused in most browsers
  /// when running in background tabs or hidden `iframe`s, to improve
  /// performance and battery life.
  ///
  /// A call to the `requestAnimationFrame()` method schedules only one single
  /// call to the callback function. If you want to animate another frame, your
  /// callback function must call `requestAnimationFrame()` again.
  ///
  /// > **Warning:** Be sure always to use the first argument (or some other
  /// > method for getting the current time) to calculate how much the animation
  /// > will progress in a frame — **otherwise, the animation will run faster on
  /// > high refresh-rate screens**. For ways to do that, see the examples
  /// > below.
  ///
  /// Calling the `requestAnimationFrame()` method requires the current worker
  /// to have an associated owner [Window]. That means that the current worker
  /// must be created by [Window] or by a dedicated worker that also has an
  /// associated owner [Window].
  external int requestAnimationFrame(FrameRequestCallback callback);

  /// @AvailableInWorkers("dedicated")
  ///
  /// The **`cancelAnimationFrame()`** method of the
  /// [DedicatedWorkerGlobalScope] interface cancels an animation frame request
  /// previously scheduled through a call to
  /// [DedicatedWorkerGlobalScope.requestAnimationFrame].
  ///
  /// Calling the `cancelAnimationFrame()` method requires the current worker to
  /// have an associated owner [Window]. That means that the current worker must
  /// be created by [Window] or by a dedicated worker that also has an
  /// associated owner [Window].
  external void cancelAnimationFrame(int handle);

  /// @AvailableInWorkers("dedicated")
  ///
  /// The **`name`** read-only property of the
  /// [DedicatedWorkerGlobalScope] interface returns the name that the
  /// [Worker] was (optionally) given when it was created. This is the name that
  /// the [Worker.Worker] constructor can pass to get a reference to
  /// the [DedicatedWorkerGlobalScope].
  external String get name;
  external EventHandler get onmessage;
  external set onmessage(EventHandler value);
  external EventHandler get onmessageerror;
  external set onmessageerror(EventHandler value);
  external EventHandler get onrtctransform;
  external set onrtctransform(EventHandler value);
}

/// The **`SharedWorkerGlobalScope`** object (the [SharedWorker] global scope)
/// is accessible through the [window.self] keyword. Some additional global
/// functions, namespaces objects, and constructors, not typically associated
/// with the worker global scope, but available on it, are listed in the
/// [JavaScript Reference](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference).
/// See the complete list of
/// [functions available to workers](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Functions_and_classes_available_to_workers).
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/SharedWorkerGlobalScope).
extension type SharedWorkerGlobalScope._(JSObject _)
    implements WorkerGlobalScope, JSObject {
  /// The **`close()`** method of the [SharedWorkerGlobalScope] interface
  /// discards any tasks queued in the `SharedWorkerGlobalScope`'s event loop,
  /// effectively closing this particular scope.
  external void close();

  /// The **`name`** read-only property of the
  /// [SharedWorkerGlobalScope] interface returns the name that the
  /// [SharedWorker] was (optionally) given when it was created. This is the
  /// name
  /// that the [SharedWorker.SharedWorker] constructor can pass
  /// to get a reference to the [SharedWorkerGlobalScope].
  external String get name;
  external EventHandler get onconnect;
  external set onconnect(EventHandler value);
}

/// @AvailableInWorkers("window_and_worker_except_service")
///
/// The **`Worker`** interface of the
/// [Web Workers API](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API)
/// represents a background task that can be created via script, which can send
/// messages back to its creator.
///
/// Creating a worker is done by calling the `Worker("path/to/worker/script")`
/// constructor.
///
/// Workers may themselves spawn new workers, as long as those workers are
/// hosted at the same
/// [origin](https://developer.mozilla.org/en-US/docs/Web/Security/Same-origin_policy)
/// as the parent page.
///
/// Note that not all interfaces and functions are available to web workers. See
/// [Functions and classes available to Web Workers](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Functions_and_classes_available_to_workers)
/// for details.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/Worker).
extension type Worker._(JSObject _) implements EventTarget, JSObject {
  external factory Worker(
    JSAny scriptURL, [
    WorkerOptions options,
  ]);

  /// @AvailableInWorkers("window_and_worker_except_service")
  ///
  /// The **`terminate()`** method of the [Worker] interface immediately
  /// terminates the [Worker]. This does not offer the worker an opportunity to
  /// finish its operations; it is stopped at once.
  external void terminate();

  /// @AvailableInWorkers("window_and_worker_except_service")
  ///
  /// The **`postMessage()`** method of the [Worker] interface sends a message
  /// to the worker. The first parameter is the data to send to the worker. The
  /// data may be any JavaScript object that can be handled by the
  /// [structured clone algorithm](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Structured_clone_algorithm).
  ///
  /// The [Worker] `postMessage()` method delegates to the [MessagePort]
  /// [MessagePort.postMessage] method, which adds a task on the event loop
  /// corresponding to the receiving [MessagePort].
  ///
  /// The `Worker` can send back information to the thread that spawned it using
  /// the [DedicatedWorkerGlobalScope.postMessage] method.
  external void postMessage(
    JSAny? message, [
    JSObject optionsOrTransfer,
  ]);
  external EventHandler get onmessage;
  external set onmessage(EventHandler value);
  external EventHandler get onmessageerror;
  external set onmessageerror(EventHandler value);
  external EventHandler get onerror;
  external set onerror(EventHandler value);
}
extension type WorkerOptions._(JSObject _) implements JSObject {
  external factory WorkerOptions({
    WorkerType type,
    RequestCredentials credentials,
    String name,
  });

  external WorkerType get type;
  external set type(WorkerType value);
  external RequestCredentials get credentials;
  external set credentials(RequestCredentials value);
  external String get name;
  external set name(String value);
}

/// The **`SharedWorker`** interface represents a specific kind of worker that
/// can be _accessed_ from several browsing contexts, such as several windows,
/// iframes or even workers. They implement an interface different than
/// dedicated workers and have a different global scope,
/// [SharedWorkerGlobalScope].
///
/// > **Note:** If SharedWorker can be accessed from several browsing contexts,
/// > all those browsing contexts must share the exact same origin (same
/// > protocol, host and port).
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/SharedWorker).
extension type SharedWorker._(JSObject _) implements EventTarget, JSObject {
  external factory SharedWorker(
    JSAny scriptURL, [
    JSAny options,
  ]);

  /// The **`port`** property of the [SharedWorker]
  /// interface returns a [MessagePort] object used to communicate and control
  /// the shared worker.
  external MessagePort get port;
  external EventHandler get onerror;
  external set onerror(EventHandler value);
}

/// The **`WorkerNavigator`** interface represents a subset of the [Navigator]
/// interface allowed to be accessed from a [Worker]. Such an object is
/// initialized for each worker and is available via the
/// [WorkerGlobalScope.navigator] property.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/WorkerNavigator).
extension type WorkerNavigator._(JSObject _) implements JSObject {
  /// The read-only **`WorkerNavigator.mediaCapabilities`** property
  /// returns a [MediaCapabilities] object that can expose information about the
  /// decoding and encoding capabilities for a given format and output
  /// capabilities as defined
  /// by the
  /// [Media Capabilities API](https://developer.mozilla.org/en-US/docs/Web/API/Media_Capabilities_API).
  external MediaCapabilities get mediaCapabilities;

  /// The **`permissions`** read-only property of the [WorkerNavigator]
  /// interface
  /// returns a [Permissions] object that can be used to query and update
  /// permission status of APIs covered by the
  /// [Permissions API](https://developer.mozilla.org/en-US/docs/Web/API/Permissions_API).
  external Permissions get permissions;

  /// The **`serviceWorker`** read-only property of the [WorkerNavigator]
  /// interface returns the [ServiceWorkerContainer] object for the
  /// [associated document](https://html.spec.whatwg.org/multipage/browsers.html#concept-document-window),
  /// which provides access to registration, removal, upgrade, and communication
  /// with the [ServiceWorker].
  ///
  /// The feature may not be available in private mode.
  external ServiceWorkerContainer get serviceWorker;

  /// The **`usb`** read-only property of the [WorkerNavigator] interface
  /// returns a [USB] object for the current document, providing access to
  /// [WebUSB API](https://developer.mozilla.org/en-US/docs/Web/API/WebUSB_API)
  /// functionality.
  external JSObject get usb;

  /// The **`deviceMemory`** read-only
  /// property of the [WorkerNavigator] interface returns the approximate amount
  /// of
  /// device memory in gigabytes.
  ///
  /// The reported value is imprecise to curtail . It's approximated by
  /// rounding down to the nearest power of 2, then dividing that number by
  /// 1024. It is then
  /// clamped within lower and upper bounds to protect the privacy of owners of
  /// very low-memory or
  /// high-memory devices.
  external double get deviceMemory;

  /// The value of the **`WorkerNavigator.appCodeName`** property is
  /// always "`Mozilla`", in any browser. This property is kept only for
  /// compatibility purposes.
  ///
  /// > **Note:** Do not rely on this property to return a real
  /// > product name. All browsers return "`Mozilla`" as the value of this
  /// > property.
  external String get appCodeName;

  /// The value of the **`WorkerNavigator.appName`** property is always
  /// "`Netscape`", in any browser. This property is kept only for compatibility
  /// purposes.
  ///
  /// > **Note:** Do not rely on this property to return a real browser name.
  /// > All browsers return "`Netscape`" as the value of this property.
  external String get appName;

  /// Returns either "`4.0`" or a string representing version information about
  /// the browser.
  ///
  /// > **Note:** Do not rely on this property to return the correct browser
  /// > version.
  external String get appVersion;

  /// Returns a string representing the platform of the browser. The
  /// specification allows
  /// browsers to always return the empty string, so don't rely on this property
  /// to get a
  /// reliable answer.
  external String get platform;

  /// The value of the **`WorkerNavigator.product`** property is always
  /// "`Gecko`", in any browser. This property is kept only for compatibility
  /// purposes.
  ///
  /// > **Note:** Do not rely on this property to return a real product name.
  /// > All browsers return "`Gecko`" as the value of this property.
  external String get product;

  /// The **`WorkerNavigator.userAgent`** read-only property returns the
  /// user agent string for the current browser.
  ///
  /// > **Note:** The specification asks browsers to provide as little
  /// > information via this field as
  /// > possible. Never assume that the value of this property will stay the
  /// > same in future
  /// > versions of the same browser. Try not to use it at all, or only for
  /// > current and past
  /// > versions of a browser. New browsers may start using the same UA, or part
  /// > of it, as an
  /// > older browser: you really have no guarantee that the browser agent is
  /// > indeed the one
  /// > advertised by this property.
  /// >
  /// > Also keep in mind that users of a browser can change the value of this
  /// > field if they
  /// > want (UA spoofing).
  ///
  /// Browser identification based on detecting the user agent string is
  /// **unreliable** and **is not recommended**, as the user agent
  /// string is user configurable. For example:
  ///
  /// - In Firefox, you can change the preference `general.useragent.override`
  ///   in
  /// `about:config`. Some Firefox extensions do that; however, this only
  /// changes
  /// the HTTP header that gets sent, and doesn't affect browser detection
  /// performed by
  /// JavaScript code.
  /// - Opera 6+ allows users to set the browser identification string via a
  ///   menu.
  external String get userAgent;

  /// The **`WorkerNavigator.language`** read-only property returns
  /// a string representing the preferred language of the user, usually the
  /// language of the
  /// browser UI.
  external String get language;

  /// The **`WorkerNavigator.languages`** read-only property
  /// returns an array of strings representing the user's preferred
  /// languages. The language is described using language tags according to
  /// `5646, "Tags for Identifying Languages (also known as BCP 47)"`. In the
  /// returned
  /// array they are ordered by preference with the most preferred language
  /// first.
  ///
  /// The value of [WorkerNavigator.language] is the
  /// first element of the returned array.
  ///
  /// When its value changes, as the user's preferred languages are changed a
  /// [Window.languagechange_event] event is fired on the [WorkerGlobalScope]
  /// object.
  ///
  /// The `Accept-Language` HTTP header in every HTTP request from the user's
  /// browser uses the same value for the `navigator.languages` property except
  /// for
  /// the extra `qvalues` (quality values) field (e.g. `en-US;q=0.8`).
  external JSArray<JSString> get languages;

  /// Returns the online status of the browser. The property returns a boolean
  /// value, with `true` meaning online and `false` meaning offline. The
  /// property sends updates whenever the browser's ability to connect to the
  /// network changes. The update occurs when the user follows links or when a
  /// script requests a remote page.
  ///
  /// For example, the property should return `false` when users click links
  /// soon after they lose internet connection.
  ///
  /// Browsers implement this property differently.
  ///
  /// In Chrome and Safari, if the browser is not able to connect to a local
  /// area network (LAN) or a router, it is offline; all other conditions return
  /// `true`. So while you can assume that the browser is offline when it
  /// returns a `false` value, you cannot assume that a true value necessarily
  /// means that the browser can access the internet. You could be getting false
  /// positives, such as in cases where the computer is running a virtualization
  /// software that has virtual ethernet adapters that are always
  /// "connected." Therefore, if you really want to determine the online status
  /// of the browser, you should develop additional means for checking. To learn
  /// more, see the 2011 article,
  /// [Working Off the Grid](https://developer.chrome.com/docs/workbox/service-worker-overview/).
  ///
  /// In Firefox, switching the browser to offline mode sends a `false` value.
  external bool get onLine;

  /// The **`navigator.hardwareConcurrency`** read-only property
  /// returns the number of logical processors available to run threads on the
  /// user's
  /// computer.
  external int get hardwareConcurrency;

  /// The **`connection`** read-only property of the [WorkerNavigator] interface
  /// returns a [NetworkInformation] object containing information about the
  /// system's connection, such as the current bandwidth of the user's device or
  /// whether the connection is metered.
  /// This could be used to select high definition content or low definition
  /// content based on the user's connection.
  external NetworkInformation get connection;

  /// The **`storage`** read-only property of the [WorkerNavigator] interface
  /// returns the singleton [StorageManager] object used to
  /// access the overall storage capabilities of the browser for the current
  /// site or app.
  /// The returned object lets you examine and configure persistence of data
  /// stores and
  /// learn approximately how much more space your browser has available for
  /// local storage
  /// use.
  external StorageManager get storage;

  /// The **`locks`** read-only property of
  /// the [WorkerNavigator] interface returns a [LockManager]
  /// object which provides methods for requesting a new [Lock] object and
  /// querying for an existing `Lock` object.
  external LockManager get locks;
}

/// The **`WorkerLocation`** interface defines the absolute location of the
/// script executed by the [Worker]. Such an object is initialized for each
/// worker and is available via the [WorkerGlobalScope.location] property
/// obtained by calling `self.location`.
///
/// This interface is only visible from inside a JavaScript script executed in
/// the context of a Web worker.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/WorkerLocation).
extension type WorkerLocation._(JSObject _) implements JSObject {
  /// The **`href`** property of a [WorkerLocation] object returns a string
  /// containing the serialized [URL] for the worker's location.
  external String get href;

  /// The **`origin`** property of a [WorkerLocation] object returns the
  /// worker's [URL.origin].
  external String get origin;

  /// The **`protocol`** property of a [WorkerLocation] object returns the
  /// [URL.protocol] part of the worker's location.
  external String get protocol;

  /// The **`host`** property of a [WorkerLocation] object returns the
  /// [URL.host] part of the worker's location.
  external String get host;

  /// The **`hostname`** property of a [WorkerLocation] object returns the
  /// [URL.hostname] part of the worker's location.
  external String get hostname;

  /// The **`port`** property of a [WorkerLocation] object returns the
  /// [URL.port] part of the worker's location.
  external String get port;

  /// The **`pathname`** property of a [WorkerLocation] object returns the
  /// [URL.pathname] part of the worker's location.
  external String get pathname;

  /// The **`search`** property of a [WorkerLocation] object returns the
  /// [URL.search] part of the worker's location.
  external String get search;

  /// The **`hash`** property of a [WorkerLocation] object returns the
  /// [URL.hash] part of the worker's location.
  external String get hash;
}

/// The **`WorkletGlobalScope`** interface is an abstract class that specific
/// worklet scope classes inherit from. Each `WorkletGlobalScope` defines a new
/// global environment.
///
/// > **Note:** You don't normally need to interact with this interface. It is a
/// > base interface intended to be subclassed. You will encounter the
/// > subclasses [AudioWorkletGlobalScope] inside [AudioWorklet] objects, or
/// > [PaintWorkletGlobalScope] inside CSS paint [Worklet] objects.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/WorkletGlobalScope).
extension type WorkletGlobalScope._(JSObject _) implements JSObject {}

/// The **`Worklet`** interface is a lightweight version of [Worker] and gives
/// developers access to low-level parts of the rendering pipeline.
///
/// With Worklets, you can run JavaScript and
/// [WebAssembly](https://developer.mozilla.org/en-US/docs/WebAssembly) code to
/// do graphics rendering or audio processing where high performance is
/// required.
///
/// Worklets allow static import of
/// [ECMAScript modules](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules),
/// if supported, using
/// [`import`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import).
/// Dynamic import is disallowed by the specification — calling
/// [`import()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/import)
/// will throw.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/Worklet).
extension type Worklet._(JSObject _) implements JSObject {
  /// The **`addModule()`** method of the
  /// [Worklet] interface loads the module in the given JavaScript file and
  /// adds it to the current `Worklet`.
  external JSPromise<JSAny?> addModule(
    String moduleURL, [
    WorkletOptions options,
  ]);
}
extension type WorkletOptions._(JSObject _) implements JSObject {
  external factory WorkletOptions({RequestCredentials credentials});

  external RequestCredentials get credentials;
  external set credentials(RequestCredentials value);
}

/// The **`Storage`** interface of the
/// [Web Storage API](https://developer.mozilla.org/en-US/docs/Web/API/Web_Storage_API)
/// provides access to a particular domain's session or local storage. It
/// allows, for example, the addition, modification, or deletion of stored data
/// items.
///
/// To manipulate, for instance, the session storage for a domain, a call to
/// [Window.sessionStorage] is made; whereas for local storage the call is made
/// to [Window.localStorage].
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/Storage).
extension type Storage._(JSObject _) implements JSObject {
  /// The **`key()`** method of the [Storage] interface,
  /// when passed a number n, returns the name of the nth key in a given
  /// `Storage`
  /// object. The order of keys is user-agent defined, so you should not rely on
  /// it.
  external String? key(int index);

  /// The **`getItem()`** method of the [Storage]
  /// interface, when passed a key name, will return that key's value, or `null`
  /// if
  /// the key does not exist, in the given `Storage` object.
  external String? getItem(String key);

  /// The **`setItem()`** method of the [Storage]
  /// interface, when passed a key name and value, will add that key to the
  /// given
  /// `Storage` object, or update that key's value if it already exists.
  external void setItem(
    String key,
    String value,
  );

  /// The **`removeItem()`** method of the [Storage]
  /// interface, when passed a key name, will remove that key from the given
  /// `Storage` object if it exists.
  /// The **`Storage`** interface of the
  /// [Web Storage API](https://developer.mozilla.org/en-US/docs/Web/API/Web_Storage_API)
  /// provides access to a
  /// particular domain's session or local storage.
  ///
  /// If there is no item associated with the given key, this method will do
  /// nothing.
  external void removeItem(String key);

  /// The **`clear()`** method of the [Storage]
  /// interface clears all keys stored in a given `Storage` object.
  external void clear();

  /// The **`length`** read-only property of the
  /// [Storage] interface returns the number of data items stored in a given
  /// `Storage` object.
  external int get length;
}

/// The **`StorageEvent`** interface is implemented by the
/// [Window.storage_event] event, which is
/// sent to a window
/// when a storage area the window has access to is changed within the context
/// of another document.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/StorageEvent).
extension type StorageEvent._(JSObject _) implements Event, JSObject {
  external factory StorageEvent(
    String type, [
    StorageEventInit eventInitDict,
  ]);

  /// The **`StorageEvent.initStorageEvent()`** method is used to initialize the
  /// value of a [StorageEvent].
  external void initStorageEvent(
    String type, [
    bool bubbles,
    bool cancelable,
    String? key,
    String? oldValue,
    String? newValue,
    String url,
    Storage? storageArea,
  ]);

  /// The **`key`** property of the [StorageEvent] interface returns the key for
  /// the storage item that was changed.
  external String? get key;

  /// The **`oldValue`** property of the [StorageEvent] interface returns the
  /// original value of the storage item whose value changed.
  external String? get oldValue;

  /// The **`newValue`** property of the [StorageEvent] interface returns the
  /// new value of the storage item whose value was changed.
  external String? get newValue;

  /// The **`url`** property of the [StorageEvent] interface returns the URL of
  /// the document whose storage changed.
  external String get url;

  /// The **`storageArea`** property of the [StorageEvent] interface returns the
  /// storage object that was affected.
  external Storage? get storageArea;
}
extension type StorageEventInit._(JSObject _) implements EventInit, JSObject {
  external factory StorageEventInit({
    bool bubbles,
    bool cancelable,
    bool composed,
    String? key,
    String? oldValue,
    String? newValue,
    String url,
    Storage? storageArea,
  });

  external String? get key;
  external set key(String? value);
  external String? get oldValue;
  external set oldValue(String? value);
  external String? get newValue;
  external set newValue(String? value);
  external String get url;
  external set url(String value);
  external Storage? get storageArea;
  external set storageArea(Storage? value);
}

/// The **`HTMLMarqueeElement`** interface provides methods to manipulate
/// `marquee` elements.
///
/// It inherits properties and methods from the [HTMLElement] interface.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLMarqueeElement).
extension type HTMLMarqueeElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLMarqueeElement] using the tag 'marquee'.
  HTMLMarqueeElement() : _ = document.createElement('marquee');

  external void start();
  external void stop();
  external String get behavior;
  external set behavior(String value);
  external String get bgColor;
  external set bgColor(String value);
  external String get direction;
  external set direction(String value);
  external String get height;
  external set height(String value);
  external int get hspace;
  external set hspace(int value);
  external int get loop;
  external set loop(int value);
  external int get scrollAmount;
  external set scrollAmount(int value);
  external int get scrollDelay;
  external set scrollDelay(int value);
  external bool get trueSpeed;
  external set trueSpeed(bool value);
  external int get vspace;
  external set vspace(int value);
  external String get width;
  external set width(String value);
}

/// The **`HTMLFrameSetElement`** interface provides special properties (beyond
/// those of the regular [HTMLElement] interface they also inherit) for
/// manipulating `frameset` elements.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLFrameSetElement).
extension type HTMLFrameSetElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLFrameSetElement] using the tag 'frameset'.
  HTMLFrameSetElement() : _ = document.createElement('frameset');

  external String get cols;
  external set cols(String value);
  external String get rows;
  external set rows(String value);
  external EventHandler get onafterprint;
  external set onafterprint(EventHandler value);
  external EventHandler get onbeforeprint;
  external set onbeforeprint(EventHandler value);
  external OnBeforeUnloadEventHandler get onbeforeunload;
  external set onbeforeunload(OnBeforeUnloadEventHandler value);
  external EventHandler get onhashchange;
  external set onhashchange(EventHandler value);
  external EventHandler get onlanguagechange;
  external set onlanguagechange(EventHandler value);
  external EventHandler get onmessage;
  external set onmessage(EventHandler value);
  external EventHandler get onmessageerror;
  external set onmessageerror(EventHandler value);
  external EventHandler get onoffline;
  external set onoffline(EventHandler value);
  external EventHandler get ononline;
  external set ononline(EventHandler value);
  external EventHandler get onpagehide;
  external set onpagehide(EventHandler value);
  external EventHandler get onpageshow;
  external set onpageshow(EventHandler value);
  external EventHandler get onpopstate;
  external set onpopstate(EventHandler value);
  external EventHandler get onrejectionhandled;
  external set onrejectionhandled(EventHandler value);
  external EventHandler get onstorage;
  external set onstorage(EventHandler value);
  external EventHandler get onunhandledrejection;
  external set onunhandledrejection(EventHandler value);
  external EventHandler get onunload;
  external set onunload(EventHandler value);
  external EventHandler get ongamepadconnected;
  external set ongamepadconnected(EventHandler value);
  external EventHandler get ongamepaddisconnected;
  external set ongamepaddisconnected(EventHandler value);
}
extension type HTMLFrameElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLFrameElement] using the tag 'frame'.
  HTMLFrameElement() : _ = document.createElement('frame');

  external String get name;
  external set name(String value);
  external String get scrolling;
  external set scrolling(String value);
  external String get src;
  external set src(String value);
  external String get frameBorder;
  external set frameBorder(String value);
  external String get longDesc;
  external set longDesc(String value);
  external bool get noResize;
  external set noResize(bool value);
  external Document? get contentDocument;
  external Window? get contentWindow;
  external String get marginHeight;
  external set marginHeight(String value);
  external String get marginWidth;
  external set marginWidth(String value);
}
extension type HTMLDirectoryElement._(JSObject _)
    implements HTMLElement, JSObject {
  /// Creates an [HTMLDirectoryElement] using the tag 'dir'.
  HTMLDirectoryElement() : _ = document.createElement('dir');

  external bool get compact;
  external set compact(bool value);
}

/// Implements the document object model (DOM) representation of the font
/// element. The HTML Font Element `font` defines the font size, font face and
/// color of text.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLFontElement).
extension type HTMLFontElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLFontElement] using the tag 'font'.
  HTMLFontElement() : _ = document.createElement('font');

  /// The obsolete
  /// **`HTMLFontElement.color`**
  /// property is a string that reflects the
  /// [`color`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/font#color)
  /// HTML attribute, containing either a named color or a color specified in
  /// the
  /// hexadecimal #RRGGBB format.
  ///
  /// The format of the string must follow one of the following HTML
  /// microsyntaxes:
  ///
  /// | Microsyntax              | Description                                                      | Examples                  |
  /// | ------------------------ | ---------------------------------------------------------------- | ------------------------- |
  /// | Valid name color string  | _nameOfColor (case insensitive)_                                 | `Green`, `green`, `GREEN` |
  /// | Valid hex color string   | _in_ _: #RRGGBB_ | `#008000`                 |
  /// | RGB using decimal values | _rgb(x,x,x) (x in 0-255 range)_                                  | `rgb(0 128 0)`            |
  external String get color;
  external set color(String value);

  /// The obsolete
  /// **`HTMLFontElement.face`**
  /// property is a string that reflects the
  /// [`face`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/font#face)
  /// HTML attribute, containing a comma-separated list of one or more font
  /// names.
  ///
  /// The document text, in the default style, is rendered as the first font
  /// face that the
  /// client's browser supports. If no font listed is installed on the local
  /// system, the
  /// browser typically defaults to the proportional or fixed-width font for
  /// that system.
  ///
  /// The format of the string must follow one of the following HTML
  /// microsyntax:
  ///
  /// | Microsyntax                                 | Description                                                         | Examples          |
  /// | ------------------------------------------- | ------------------------------------------------------------------- | ----------------- |
  /// | List of one or more valid font family names | _A list of font names, that have to be present on the local system_ | `courier,verdana` |
  external String get face;
  external set face(String value);

  /// The obsolete
  /// **`HTMLFontElement.size`** property is a
  /// string that reflects the
  /// [`size`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/font#size)
  /// HTML
  /// attribute. It contains either a font size ranging from 1 to 7 or a
  /// number relative to the default value 3, for example -2 or +1.
  ///
  /// The format of the string must follow one of the following HTML
  /// microsyntaxes:
  ///
  /// <table class="no-markdown">
  ///   <thead>
  ///     <tr>
  ///       <th scope="col">Microsyntax</th>
  ///       <th scope="col">Description</th>
  ///       <th scope="col">Examples</th>
  ///     </tr>
  ///   </thead>
  ///   <tbody>
  ///     <tr>
  ///       <td>Valid size number string</td>
  ///       <td><em>integer number in the range of 1-7</em></td>
  ///       <td><code>6</code></td>
  ///     </tr>
  ///     <tr>
  ///       <td>Relative size string</td>
  ///       <td>
  ///         <em>+x or -x, where x is a number relative to 3 (the result should be in the range of 1-7)</em>
  ///       </td>
  ///       <td>
  ///         <code>+2<br />-1</code>
  ///       </td>
  ///     </tr>
  ///   </tbody>
  /// </table>
  external String get size;
  external set size(String value);
}

/// The **`HTMLParamElement`** interface provides special properties (beyond
/// those of the regular [HTMLElement] object interface it inherits) for
/// manipulating `param` elements, representing a pair of a key and a value that
/// acts as a parameter for an `object` element.
///
/// ---
///
/// API documentation sourced from
/// [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/API/HTMLParamElement).
extension type HTMLParamElement._(JSObject _) implements HTMLElement, JSObject {
  /// Creates an [HTMLParamElement] using the tag 'param'.
  HTMLParamElement() : _ = document.createElement('param');

  external String get name;
  external set name(String value);
  external String get value;
  external set value(String value);
  external String get type;
  external set type(String value);
  external String get valueType;
  external set valueType(String value);
}
extension type External._(JSObject _) implements JSObject {
  external void AddSearchProvider();
  external void IsSearchProviderInstalled();
}