HTML

2D canvas

Note: This feature is available in Web Workers.

Canvas and graphics

captureStream() for <canvas>

The CanvasCaptureMediaStreamTrack interface of the Media Capture and Streams API represents the video track contained in a MediaStream being generated from a <canvas> following a call to HTMLCanvasElement.

CanvasMediaStreamCapture

Offscreen canvas

Note: This feature is available in Web Workers.

CanvasWorkerPerformance

WebGL

The webglcontextcreationerror event of the WebGL API is fired if the user agent is unable to create a WebGLRenderingContext context.

WebGL3DGraphics

<meter>

The <meter> HTML element represents either a scalar value within a known range or a fractional value.

DataMeasurementsStatus

<progress>

The <progress> HTML element displays an indicator showing the completion progress of a task, typically displayed as a progress bar.

DataProgressStatus

Description list

The <dd> HTML element provides the description, definition, or value for the preceding term (<dt>) in a description list (<dl>).

DataListsMetadata

Tables

The <table> HTML element represents tabular data—that is, information presented in a two-dimensional table comprised of rows and columns of cells containing data.

DataTablesStructure

WidelyDevice APIs

Gamepad

The Gamepad interface of the Gamepad API defines an individual gamepad or other controller, allowing access to information such as button presses, axis positions, and id.

DeviceLocationPermissions

WidelyDevice APIs

Geolocation API

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

<address>

The <address> HTML element indicates that the enclosed HTML provides contact information for a person or people, or for an organization.

DocumentContactMetadata

<article>

The <article> HTML element represents a self-contained composition in a document, page, application, or site, which is intended to be independently distributable or reusable (e.

DocumentSectionsContent

<figure> and <figcaption>

The <figure> HTML element represents self-contained content, potentially with an optional caption, which is specified using the <figcaption> element.

DocumentMediaCaptions

DocumentHeadingsNavigation

<h1> through <h6>

The <h1> to <h6> HTML elements represent six levels of section headings.

<ol>, <ul>, and <li>

The <li> HTML element is used to represent an item in a list.

DocumentListsSemantics

WidelyEditing

contenteditable

The contenteditable global attribute is an enumerated attribute indicating if the element should be editable by the user.

EditingRich textInput

WidelyEmbedded

Encrypted media extensions

The encrypted event is fired when initialization data is found in the media that indicates it is encrypted.

WidelyEmbedded

Media capture

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

EmbeddingDocumentsIsolation

WidelyEmbedding

<iframe>

The <iframe> HTML element represents a nested browsing context, embedding another HTML page into the current one.

WidelyEmbedding

srcdoc

Warning:

EmbeddingSandboxingDocuments

<button>

The <button> HTML element is an interactive element activated by a user with a mouse, keyboard, finger, voice command, or other assistive technology.

FormsInteractiveControls

<fieldset> and <legend>

The <fieldset> HTML element is used to group several controls as well as labels (<label>) within a web form.

FormsGroupingSemantics

<form>

The <form> HTML element represents a document section containing interactive controls for submitting information.

FormsSubmissionInput

<input type="button">

<input> elements of type button are rendered as push buttons, which can be programmed to control custom functionality anywhere on a webpage as required when assigned an event handler function (typically for the click event).

<input type="checkbox">

<input> elements of type checkbox are rendered by default as boxes that are checked (ticked) when activated, like you might see in an official government paper form.

<input type="file" multiple>

The Boolean multiple attribute, if set, means the form control accepts one or more values.

<input type="file">

<input> elements with type="file" let the user choose one or more files from their device storage.

<input type="hidden">

<input> elements of type hidden let web developers include data that cannot be seen or modified by users when a form is submitted.

<input type="image">

<input> elements of type image are used to create graphical submit buttons, i.

<input type="number">

The max attribute defines the maximum value that is acceptable and valid for the input containing the attribute.

<input type="password">

<input> elements of type password provide a way for the user to securely enter a password.

<input type="radio">

<input> elements of type radio are generally used in radio groups—collections of radio buttons describing a set of related options.

<input type="range">

<input> elements of type range let the user specify a numeric value which must be no less than a given value, and no more than another given value.

<input type="reset">

<input> elements of type reset are rendered as buttons, with a default click event handler that resets all inputs in the form to their initial values.

<input type="search">

<input> elements of type search are text fields designed for the user to enter search queries into.

<input type="submit">

<input> elements of type submit are rendered as buttons.

<input>

The <input> HTML element is used to create interactive controls for web-based forms in order to accept data from the user; a wide variety of types of input data and control widgets are available, depending on the device and user agent.

<label>

The <label> HTML element represents a caption for an item in a user interface.

FormsLabelsInput

FormsCalculated valuesFeedback

<output>

The <output> HTML element is a container element into which a site or app can inject the results of a calculation or the outcome of a user action.

<select>

The <select> HTML element represents a control that provides a menu of options.

FormsSelectionControls

<textarea>

The <textarea> HTML element represents a multi-line plain-text editing control, useful when you want to allow users to enter a sizeable amount of free-form text, for example a comment on a review or feedback form.

FormsText inputMultiline

autofocus

The autofocus global attribute is a Boolean attribute indicating whether the element should be focused on page load or, if it is nested inside a <dialog> or popover element, when the <dialog> or popover is shown.

FormsFocusInput

Constraint validation API

The checkValidity() method of the HTMLButtonElement interface returns a boolean value which indicates if the element meets any constraint validation rules applied to it.

FormsValidationInput

Date and time <input> types

<input> elements of type="date" create input fields that let the user enter a date.

FormsDate and timeInput

dirname

Email, telephone, and URL <input> types

<input> elements of type email are used to let the user enter and edit an email address, or, if the multiple attribute is specified, a list of email addresses.

inputmode

The inputmode global attribute is an enumerated attribute that hints at the type of data that might be entered by the user while editing the element or its contents.

FormsMobileKeyboard

WidelyGraphics

<canvas>

Use the HTML <canvas> element with either the canvas scripting API or the WebGL API to draw graphics and animations.

GraphicsCanvasRendering

WidelyInteraction

DOM

The Attr interface represents one of an element's attributes as an object.

DOMInteractionDocument

WidelyInteraction

Selection

The AbstractRange abstract interface is the base class upon which all DOM range types are defined.

Interaction

<details>

The <details> HTML element creates a disclosure widget in which information is visible only when the widget is toggled into an open state.

InteractiveDisclosureFAQ

<dialog>

The <dialog> HTML element represents a modal or non-modal dialog box or other interactive component, such as a dismissible alert, inspector, or subwindow.

InteractiveDialogModal

InteractiveFocus managementModal

inert

The inert global attribute is a Boolean attribute indicating that the element and all of its flat tree descendants become inert.

tabindex

The tabindex global attribute allows developers to make HTML elements focusable, allow or prevent them from being sequentially focusable (usually with the Tab key, hence the name) and determine their relative ordering for sequential focus navigation.

FocusKeyboardNavigation

<audio>

The <audio> HTML element is used to embed sound content in documents.

MediaAudioPlayback

<img>

The <img> HTML element embeds an image into the document.

MediaImagesContent

MediaResponsive imagesPerformance

<picture>

The <picture> HTML element contains zero or more <source> elements and one <img> element to offer alternative versions of an image for different display/device scenarios.

<source>

The <source> HTML element specifies one or more media resources for the <picture>, <audio>, and <video> elements.

MediaSourcesFormats

<video>

The <video> HTML element embeds a media player which supports video playback into the document.

MediaVideoPlayback

MediaCaptionsAccessibility

Text tracks

The read-only textTracks

<ruby>

The <ruby> HTML element represents small annotations that are rendered above, below, or next to base text, usually used for showing the pronunciation of East Asian characters.

Import maps

The importmap value of the type attribute of the <script> element indicates that the body of the element contains an import map.

JavaScript modules

The import() syntax, commonly called dynamic import, is a function-like expression that allows loading an ECMAScript module asynchronously and dynamically into a potentially non-module environment.

srcset and sizes

The srcset property of the HTMLImageElement interface identifies one or more image candidate strings, separated using commas (,), each specifying image resources to use under given circumstances.

NavigationLinksInteractive

WidelyNavigation

<a>

The <a> HTML element (or anchor element), with its href attribute, creates a hyperlink to web pages, files, email addresses, locations in the same page, or anything else a URL can address.

accesskey

The accesskey global attribute provides a hint for generating a keyboard shortcut for the current element.

Change event

The change event is fired for <input>, <select>, and <textarea> elements when the user modifies the element's value.

CSS object model

The CSS interface holds useful CSS-related methods.

CSSOMStylesJavaScript

Dataset

The dataset read-only property

download

The HTMLAnchorElement.

LinksDownloadFiles

Drag and Drop

The DataTransfer object is used to hold any data transferred between contexts, such as a drag and drop operation, or clipboard read/write.

enterkeyhint

The enterkeyhint global attribute

FormsMobileInput

Focus events

The blur event fires when an element has lost focus.

CanvasImageBitmapPerformance

ImageBitmapRenderingContext

Note: This feature is available in Web Workers.

LanguageGlobal attributeAccessibility

lang

The lang global attribute helps define the language of an element: the language that non-editable elements are written in, or the language that the editable elements should be written in by the user.

Media playback quality

The HTMLVideoElement method

MediaPerformanceVideo

Mouse events

The auxclick event is fired at an Element when a non-primary pointing device button (any mouse button other than the primary—usually leftmost—button) has been pressed and released both within the same element.

EditingText inputAssistive

spellcheck

The spellcheck global attribute is an enumerated attribute that defines whether the element may be checked for spelling errors.

style (attribute)

The style global attribute contains CSS styling declarations to be applied to the element.

title (attribute)

The title global attribute contains text representing advisory information related to the element it belongs to.

TranslationContentGlobal attribute

translate

The translate global attribute is an enumerated attribute that is used to specify whether an element's translatable attribute values and its Text node children should be translated when the page is localized, or whether to leave them unchanged.

PerformanceModulesLoading

WebGL2

Note: This feature is available in Web Workers.

WebGL23DGraphics

WidelyPerformance

<link rel="modulepreload">

The modulepreload keyword, for the rel attribute of the <link> element, provides a declarative way to preemptively fetch a module script, parse and compile it, and store it in the document's module map for later execution.

WidelyPerformance

<link rel="preconnect">

The preconnect keyword for the rel attribute of the <link> element is a hint to browsers that the user is likely to need resources from the target resource's origin, and therefore the browser can likely improve the user experience by preemptively initiating a connection to that origin.

PerformanceNetworkingResource hints

WidelyPerformance

<link rel="preload">

The preload value of the <link> element's rel attribute lets you declare fetch requests in the

PerformanceResource hintsLoading

<aside>

The <aside> HTML element represents a portion of a document whose content is only indirectly related to the document's main content.

<header> and <footer>

The <footer> HTML element represents a footer for its nearest ancestor sectioning content or sectioning root element.

<main>

The <main> HTML element represents the dominant content of the <body> of a document.

<nav>

The <nav> HTML element represents a section of a page whose purpose is to provide navigation links, either within the current document or to other documents.

<section>

The <section> HTML element represents a generic standalone section of a document, which doesn't have a more specific semantic element to represent it.

AuthenticationPasskeysSecurity

WidelySecurity and APIs

Content Security Policy (CSP)

Experimental: This is an experimental technology

SecurityPolicyCSP

WidelySecurity and APIs

Web authentication

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

WidelySecurity and privacy

Referrer policy

The

SecurityPrivacyNetworking

WidelySecurity and privacy

Sandboxed iframes

The read-only sandbox property of the HTMLIFrameElement returns a live DOMTokenList object indicating extra restrictions on the behavior of the nested content.

SecurityEmbeddingIsolation

<b>

The <b> HTML element is used to draw the reader's attention to the element's contents, which are not otherwise granted special importance.

<base>

The <base> HTML element specifies the base URL to use for all relative URLs in a document.

DocumentURLsMetadata

<bdi>

The <bdi> HTML element tells the browser's bidirectional algorithm to treat the text it contains in isolation from its surrounding text.

<bdo>

The <bdo> HTML element overrides the current directionality of text, so that the text within is rendered in a different direction.

<body>

The <body> HTML element represents the content of an HTML document.

DocumentStructureContent

<br>

The <br> HTML element produces a line break in text (carriage-return).

<cite>

The <cite> HTML element is used to mark up the title of a creative work.

<code>

The <code> HTML element displays its contents styled in a fashion intended to indicate that the text is a short fragment of computer code.

<del>

The <del> HTML element represents a range of text that has been deleted from a document.

<dfn>

The <dfn> HTML element indicates a term to be defined.

<div>

The <div> HTML element is the generic container for flow content.

<em>

The <em> HTML element marks text that has stress emphasis.

EmbedMediaExternal content

<embed>

The <embed> HTML element embeds external content at the specified point in the document.

<head>

The <head> HTML element contains machine-readable information (metadata) about the document, like its title, scripts, and style sheets.

<hgroup>

The <hgroup> HTML element represents a heading and related content.

<hr>

The <hr> HTML element represents a thematic break between paragraph-level elements: for example, a change of scene in a story, or a shift of topic within a section.

<html>

The <html> HTML element represents the root (top-level element) of an HTML document, so it is also referred to as the root element.

<i>

The <i> HTML element represents a range of text that is set off from the normal text for some reason, such as idiomatic text, technical terms, taxonomical designations, among others.

<ins>

The <ins> HTML element represents a range of text that has been added to a document.

<kbd>

The <kbd> HTML element represents a span of inline text denoting textual user input from a keyboard, voice input, or any other text entry device.

<link>

The <link> HTML element specifies relationships between the current document and an external resource.

<mark>

The <mark> HTML element represents text which is marked or highlighted for reference or notation purposes due to the marked passage's relevance in the enclosing context.

<menu>

The <menu> HTML element is described in the HTML specification as a semantic alternative to <ul>, but treated by browsers (and exposed through the accessibility tree) as no different than <ul>.

<meta>

The <meta> HTML element represents metadata that cannot be represented by other meta-related elements, such as <base>, <link>, <script>, <style>, or <title>.

<object>

The <object> HTML element represents an external resource, which can be treated as an image, a nested browsing context, or a resource to be handled by a plugin.

<q>

The <q> HTML element indicates that the enclosed text is a short inline quotation.

<s>

The <s> HTML element renders text with a strikethrough, or a line through it.

<samp>

The <samp> HTML element is used to enclose inline text which represents sample (or quoted) output from a computer program.

<script> and <noscript>

The <script> HTML element is used to embed executable code or data; this is typically used to embed or refer to JavaScript code.

<slot>

The <slot> HTML element—part of the Web Components technology suite—is a placeholder inside a web component that you can fill with your own markup, which lets you create separate DOM trees and present them together.

<small>

The <small> HTML element represents side-comments and small print, like copyright and legal text, independent of its styled presentation.

<span>

The <span> HTML element is a generic inline container for phrasing content, which does not inherently represent anything.

<strong>

The <strong> HTML element indicates that its contents have strong importance, seriousness, or urgency.

<style>

The <style> HTML element contains style information for a document, or part of a document.

<sub> and <sup>

The <sub> HTML element specifies inline text which should be displayed as subscript for solely typographical reasons.

<template>

The <template> HTML element serves as a mechanism for holding HTML fragments, which can either be used later via JavaScript or generated immediately into shadow DOM.

<time>

The <time> HTML element represents a specific period in time.

<title>

The <title> HTML element defines the document's title that is shown in a browser's title bar or a page's tab.

<u>

The <u> HTML element represents a span of inline text which should be rendered in a way that indicates that it has a non-textual annotation.

<var>

The <var> HTML element represents the name of a variable in a mathematical expression or a programming context.

<wbr>

The <wbr> HTML element represents a word break opportunity—a position within text where the browser may optionally break a line, though its line-breaking rules would not otherwise create a break at that location.

Image maps

The <area> HTML element defines an area inside an image map that has predefined clickable areas.

TextSemanticsAbbreviation

<abbr>

The <abbr> HTML element represents an abbreviation or acronym.

<blockquote>

The <blockquote> HTML element indicates that the enclosed text is an extended quotation.

TextQuotationsContent

TextMachine-readableMetadata

<data>

The <data> HTML element links a given piece of content with a machine-readable translation.

<p>

The <p> HTML element represents a paragraph.

TextParagraphsContent

Web ComponentsFormsCustom elements

<pre>

The <pre> HTML element represents preformatted text which is to be presented exactly as written in the HTML file.

TextCodeWhitespace

WidelyWeb Components

Form-associated custom elements

The ElementInternals interface of the Document Object Model gives web developers a way to allow custom elements to fully participate in HTML forms.

WidelyWeb Components

Imperative slot assignment

The assign() method of the HTMLSlotElement interface sets the slot's manually assigned nodes to an ordered set of slottables.

Web ComponentsSlotsComposition

NewlyCanvas and graphics

willReadFrequently

The optional willReadFrequently parameter of a canvas's getContext() method permits the browser to optimize for frequent getImageData() calls by avoiding hardware acceleration. Also known as multiple readback.

Canvas and graphics

NewlyEmbedded

Lazy-loading images and iframes

The loading property of the HTMLIFrameElement interface is a string that provides a hint to the browser indicating whether the iframe should be loaded immediately on page load, or only when it is needed.

NewlyEmbedded

Screen wake lock

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

NewlyForms

<input type="file" webkitdirectory>

Note: This feature is available in Web Workers.

NewlyForms

Invoker commands

The CommandEvent interface represents an event notifying the user when a button element with valid commandForElement and command attributes is about to invoke an interactive element.

FormsInteraction

NewlyMedia

preservesPitch

The HTMLMediaElement.

NewlyMedia

requestVideoFrameCallback()

The requestVideoFrameCallback() method of the HTMLVideoElement interface registers a callback function that runs when a new video frame is sent to the compositor.

NewlyMetadata and scripts

Declarative shadow DOM

The <template> HTML element serves as a mechanism for holding HTML fragments, which can either be used later via JavaScript or generated immediately into shadow DOM.

NewlyMetadata and scripts

Popover

The popover global attribute is used to designate an element as a popover element.

NewlyMetadata and scripts

Preloading responsive images

The imageSizes property of the HTMLLinkElement interface indicates the size and conditions for the preloaded images defined by the imageSrcset property.

NewlyOther

contenteditable="plaintext-only"

The contenteditable="plaintext-only" global HTML attribute allows the user to edit the content of an element, but prevents rich-text formatting.

NewlyOther

Scroll to text fragment

The fragmentDirective read-only property of the Document interface returns the FragmentDirective for the current document.

Security and APIsSecurity

NewlyResource hints

<link rel="dns-prefetch">

The dns-prefetch keyword for the rel attribute of the <link> element is a hint to browsers that the user is likely to need resources from the target resource's origin, and therefore the browser can likely improve the user experience by preemptively performing DNS resolution for that origin.

Resource hints

NewlyResource hints

Fetch priority

The fetchpriority attribute allows a developer to signal that fetching a particular image early in the loading process has more or less impact on user experience than a browser can reasonably infer when assigning an internal priority.

Resource hints

NewlySecurity and APIs

Storage access

The hasStorageAccess() method of the Document interface returns a Promise that resolves with a boolean value indicating whether the document has access to third-party, unpartitioned cookies.

NewlySecurity and APIs

Trusted types

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.

Security and APIsSecurity

NewlyText and structure

<search>

The <search> HTML element is a container representing the parts of the document or application with form controls or other content related to performing a search or filtering operation.

Text and structureInteraction

NewlyText and structure

dialog.requestClose()

The requestClose() method of the HTMLDialogElement interface requests to close the <dialog>.

NewlyText and structure

Mutually exclusive <details> elements

The name property of the HTMLDetailsElement interface reflects the name attribute of <details> elements.

2D canvas opacity

The optional alpha parameter of a 2D canvas's getContext() method sets whether the canvas has an alpha transparency channel. If set to false, then this permits the browser to optimize compositing for an opaque canvas.

Color management for 2D canvas

The optional colorSpace parameter of a 2D canvas's getContext() method chooses the color representation, such as "srgb" or "display-p3".

contextlost and contextrestored

The CanvasRenderingContext2D.

Canvas and graphics

Desynchronized 2D canvas

The optional desynchronized parameter of a canvas's getContext() method permits the browser to draw a 2D canvas independently of the event loop. This can reduce drawing latency.

Desynchronized WebGL canvas

The optional desynchronized parameter of a canvas's getContext() method permits the browser to draw a WebGL canvas independently of the event loop. This can reduce drawing latency.

WebGPU

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Accelerometer

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Ambient light sensor

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

CPU compute pressure

Experimental: This is an experimental technology

Gyroscope

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Magnetometer

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Attribution reporting

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Fullscreen API

The Document method

EmbeddedInteraction

Idle detection

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

EmbeddedInteraction

Local fonts

Experimental: This is an experimental technology

navigator.share()

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Permissions policy

The allow property of the HTMLIFrameElement interface indicates the Permissions Policy specified for this <iframe> element.

EmbeddedSecurity

Picture-in-picture (video)

The exitPictureInPicture() method of the Document interface

Presentation API

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Screen capture

Experimental: This is an experimental technology

Topics

Non-standard: This feature is not standardized.

Web Bluetooth

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Web MIDI

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

EmbeddedForms

Web serial

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

WebHID

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

EmbeddedForms

WebUSB

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Window management

Experimental: This is an experimental technology

`alpha` and `colorspace` attributes for `<input type=color>`

<input> elements of type color provide a user interface element that lets a user specify a color, either by using a visual color picker interface or by entering the color into a text field in a CSS color value format.

<datalist>

The <datalist> HTML element contains a set of <option> elements that represent the permissible or recommended options available to choose from within other controls.

FormsSuggestionsInput

<input type="color">

Customizable <select>

Experimental: This is an experimental technology

HTML media capture

The capture attribute specifies that, optionally, a new file should be captured, and which device should be used to capture that new media of a type defined by the accept attribute.

FormsMedia

showPicker() for <input>

The HTMLInputElement.

showPicker() for <select>

The HTMLSelectElement.

writingsuggestions

The writingsuggestions global attribute is an enumerated attribute indicating if browser-provided writing suggestions should be enabled under the scope of the element or not.

Audio and video tracks

The AudioTrack interface represents a single audio track from one of the HTML media elements, <audio> or <video>.

captureStream() for <audio> and <video>

The captureStream() method of the HTMLMediaElement interface returns a MediaStream object that streams a real-time capture of the content being rendered in the media element.

controlslist

The controlsList property of the

fastSeek()

The HTMLMediaElement.

Lazy-loading media

Experimental: This is an experimental technology

Remote playback

The RemotePlayback interface of the Remote Playback API allows the page to detect availability of remote playback devices, then connect to and control playing on these devices.

<link rel="expect">

The rel="expect" attribute for the <link> HTML element is a hint to the browser to block rendering until the element that the href value references is connected to the document and fully parsed.

<meta name="theme-color">

The theme-color value for the name attribute of the <meta> element indicates a suggested color that user agents should use to customize the display of the page or of the surrounding user interface.

blocking="render"

The read-only blocking property of the HTMLLinkElement returns a live DOMTokenList object containing the operations that should be blocked on the fetching of an external resource.

Compression Dictionary Transport

The rel attribute defines the relationship between a linked resource and the current document.

hidden="until-found"

An element receives a beforematch event when it is in the hidden until found state and the browser is about to reveal its content because the user has found the content through the "find in page" feature or through fragment navigation.

Metadata and scriptsInteraction

Interest invokers

Experimental: This is an experimental technology

Metadata and scriptsInteraction

popover="hint"

The popover="hint" global HTML attribute creates a popover that is subordinate to popovers with a popover="auto" attribute. You can use this to create tooltips that don't dismiss auto popovers.

Metadata and scriptsSecurity

Signature-based resource integrity

Signature-based resource integrity verifies a script's provenance by checking that the resource has been signed with a trusted key given by the <script> element's integrity attribute.

Speculation rules

Experimental: This is an experimental technology

<fencedframe>

Experimental: This is an experimental technology

<img sizes="auto" loading="lazy">

The sizes property of the HTMLImageElement interface allows you to specify the layout width of the image for each of a list of media queries, or auto for lazy-loaded images to allow the browser to automatically select an image to display based on the layout size of the element.

<meta name="application-title">

The name="application-title" attribute for the <meta> HTML element sets an installed web application's title bar text.

Alternative style sheets

The alternate stylesheet keyword pair, when used as a value for the rel attribute of the <link> element, indicates that the target resource is an alternative style sheet.

autocapitalize

The autocapitalize global attribute is an enumerated attribute that controls whether inputted text is automatically capitalized and, if so, in what manner.

OtherForms

autocorrect

The autocorrect global attribute is an enumerated attribute that controls whether autocorrection of editable text is enabled for spelling and/or punctuation errors.

OtherForms

CSS typed object model

The CSSImageValue interface of the CSS Typed Object Model API represents values for properties that take an image, for example background-image, list-style-image, or border-image-source.

Desynchronized WebGL2 canvas

The optional desynchronized parameter of a canvas's getContext() method permits the browser to draw a WebGL2 canvas independently of the event loop. This can reduce drawing latency.

OtherGraphics

EditContext

Experimental: This is an experimental technology

Feature policy

Experimental: This is an experimental technology

OtherSecurity

Media source

Note: This feature is available in Dedicated Web Workers.

OtherMedia

MediaController

Deprecated: This feature is no longer recommended.

OtherMedia

Payment request

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

ping

The ping property of the HTMLAnchorElement interface is a space-separated list of URLs.

Private click measurement

Experimental: This is an experimental technology

Virtual keyboard

Experimental: This is an experimental technology

Web app manifest

The manifest keyword for the rel attribute of the <link> element indicates that the target resource is a Web app manifest.