Limited: WEBGL_compressed_texture_pvrtc WebGL extension Description: The WEBGL_compressed_texture_pvrtc extension for WebGL 1.0 and 2.0 contexts adds PVRTC compressed texture formats to compressedTexImage2D() and compressedTexSubImage2D().

Widely available: Web Cryptography Description: The Web Cryptography API performs low-level cryptographic operations, such as encryption, decryption, and signature verification. Also known as the Web Crypto API.

Widely available: <video> Description: The <video> element plays videos or movies, optionally with controls provided by the browser.

Limited: User agent client hints Description: The Sec-CH-UA HTTP request header and the navigator.userAgentData API expose browser and platform information used to vary responses and application logic. User agent client hints are similar to user...

Widely available: Text encoding and decoding Description: The TextEncoder API transforms a stream of code points into a byte stream with UTF-8 encoding, and TextDecoder does the reverse.

Widely available: Streams Description: The streams API creates, composes, and consumes continuously generated data.

Widely available: spellcheck Description: The spellcheck global HTML attribute sets whether the browser may check an element for spelling errors.

Limited: Speech recognition Description: The SpeechRecognition API converts audio into text using the device's speech recognition service.

Widely available: Resource timing Description: PerformanceResourceTiming entries report when network events happen while loading a resource, such as when connections start and end. You can use this information to measure loading times.

Limited: reading-flow Description: The reading-flow CSS property sets the order in which flex or grid elements are rendered to speech or reached via focus navigation. The reading-order property overrides this order.

Widely available: Performance Description: The performance global object and the PerformanceObserver API provide access to performance-related information for the current execution context.

Limited: :open Description: The :open CSS pseudo-class matches elements that have open states, like <details>, <dialog>, or <select>, based on their state.

Widely available: Object Description: Objects in JavaScript are collections of key-value pairs.

Widely available: Object.hasOwn() Description: The Object.hasOwn() static method checks whether an object has a given property. It's a more robust alternative to the Object.prototype.hasOwnProperty() method.

Newly available: Notifications from service workers and installed apps Description: Notifications via service worker registration's showNotification() method, sent from installed web applications (for example, saved to the Home Screen on Safari for iOS), show a message to the user, ...

Widely available: MediaStream recording Description: The MediaRecorder API captures data generated by MediaStream or HTMLMediaElement objects for analysis, processing, or saving to disk. Also known as the Media Recording API.

Widely available: Media capture Description: The navigator.mediaDevices.getUserMedia() API requests access to devices that produce audio or video streams, such as microphones or video cameras.

Widely available: Media capabilities Description: The navigator.mediaCapabilities API queries the encoding and decoding abilities of the device, such as supported codecs, resolutions, and bitrates.

Limited: isInputPending() Description: The navigator.scheduling.isInputPending() method checks if there are pending input events, such as touch or mouse events. This allows you to yield from long-running scripts that might be blocking use...

Limited: interactivity Description: The interactivity: inert CSS declaration makes an element and its descendants inert, like when using the inert HTML attribute. Inert elements can't be focused or clicked, their text can't be selected...

Widely available: @font-face Description: The @font-face CSS at-rule creates a custom font-family value. The at-rule's descriptors set the font's name, source, and various display settings.

Limited: <fencedframe> Description: The <fencedframe> element embeds another HTML page into the current page in a more secure and privacy-preserving way than <iframe> elements.

Limited: Explicit resource management Description: The using and await using declarations and the dispose and asyncDispose symbols manage the lifecycle of resources such as file handles and streams. The DisposableStack and AsyncDisposableStack object...

Limited: URLPattern Description: The URLPattern API creates patterns that can be matched against URLs or URL components.

Limited: Scheduler API Description: The scheduler API provides a way to prioritize all tasks belonging to an application.

Limited: Private network access Description: The Access-Control-Request-Private-Network: true and Access-Control-Allow-Private-Network: true HTTP request and response headers establish permission for websites to make requests to internal networ...

Limited: :open Description: The :open CSS pseudo-class matches elements that have open states, like <details, <dialog>, or <select>, based on their state.

Limited: Local network access Description: The "local-network-access" user permission (and certain actions that imply this permission, such as a fetch() request with { targetAddressSpace: "local" }) allows a site to send requests to servers o...

Limited: Device posture Description: The device posture API and the device-posture CSS media feature reflect the physical posture of a device, such as whether a foldable device is folded or unfolded.

Newly available: Selection composed ranges Description: The window.getSelection().getComposedRanges() method returns ranges that represent the current user selection, even if the selection spans across shadow tree boundaries.

Limited: Speech recognition Description: The SpeechRecognition API converts audio into text using the device's speech recognition service.

Widely available: scrollIntoView() Description: The scrollIntoView() method scrolls an element's ancestor containers such that the element is visible to the user.

Limited: Reporting API Description: The Reporting-Endpoints HTTP header and ReportingObserver() API send reports of Content Security Policy (CSP) violations, Permissions-Policy violations, deprecated feature usage, browser intervention...

Limited: Private network access Description: The Access-Control-Request-Private-Network: true and Access-Control-Allow-Private-Network: true HTTP request and response headers establish permission for websites to make requests to internal networ...

Newly available: createImageBitmap Description: The createImageBitmap() global method creates an ImageBitmap object from a source such as an image, SVG, blob, or canvas. An ImageBitmap object represents pixel data that can be drawn to a canvas wit...

Widely available: Container queries Description: Container size queries with the @container at-rule apply styles to an element based on the dimensions of its container.

Limited: Speech recognition Description: The SpeechRecognition API converts audio into text using the device's speech recognition service.

Limited: Unsanitized HTML parsing methods Description: The Document.parseHTMLUnsafe() static method parses HTML into a DOM tree, while the setHTMLUnsafe() method of Element and ShadowRoot parses and inserts HTML into an existing tree. No sanitization app...

Widely available: Grid Description: CSS grid is a two-dimensional layout system, which lays content out in rows and columns.

Widely available: Flexbox Description: Flexbox is a one-dimensional layout system, which places content either horizontally or vertically, with optional wrapping.

Widely available: color-scheme Description: The color-scheme CSS property sets which color schemes (light or dark) an element uses and may prevent automatic dark mode adjustments by the browser.

Newly available: abs() and sign() Description: The abs() and sign() CSS functions compute the absolute value or the sign of the input.

Widely available: WebRTC statistics Description: The RTCPeerConnection.getStats(), RTCRtpSender.getStats(), and RTCRtpReceiver.getStats() methods return detailed information about the status, performance, network, and media for a given WebRTC conne...

Limited: Sanitizer API Description: The parseHTML() method for the Document interface and the setHTML() methods for the Element and ShadowRoot interfaces parse and insert HTML into the DOM in a way that can prevent cross-site scripting...

Limited: Partitioned cookies Description: Partitioned cookies allow you to opt a cookie into partitioned storage, with a separate cookie jar per top-level site. Also known as Cookies Having Independent Partitioned State or CHIPS.

Limited: font-variant-emoji Description: The font-variant-emoji CSS property sets the default presentation for emoji characters.

Limited: <dialog closedby> Description: The closedby HTML attribute for <dialog> sets which user actions close a dialog. For example, closedby="any" allows the dialog to be closed by clicking outside of it.

Limited: Cookie store Description: The CookieStore interface is an asynchronous and promise-based API for managing cookies. It does not rely on document and so is available to service workers as well.

Limited: abs() and sign() Description: The abs() and sign() CSS functions compute the absolute value or the sign of the input.

Limited: Trusted types Description: Trusted types allow you to lock down insecure parts of the DOM API and prevent client-side cross-site scripting (XSS) attacks.