Microsoft Edge Platform Status

View the status of web platform features in Microsoft Edge (Chromium) and Microsoft Edge (EdgeHTML).

Note: This is not an exhaustive list of features. We will add more features to this list over time.

Accelerometer Supported Build Number 79

Provides access to device’s acceleration along its three primary axes.

Established standard

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Accessible Name and Description: Computation and API Mappings 1.1 Not Supported

Determines names and descriptions of accessible objects to expose via UIA for assistive technologies to describe to users.

Working draft or equivalent

Not Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Accessible Rich Internet Applications (WAI-ARIA) 1.1 Supported Build Number 79

Support for new WAI-ARIA 1.1 roles, states, and properties which define new accessible user interface elements since WAI-ARIA 1.0.

Established standard

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

a[download] attribute Supported Build Number 79

When used on an <a>, this attribute signifies that the resource it points to should be downloaded by the browser rather than navigating to it.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Ambient Light Sensor API In Development Build Number 79

Ambient Light Event API which is a handy way to make a web page or web app aware of any change in light intensity.

Working draft or equivalent

In Development in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
In Development in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

APNG image format Supported Build Number 79

APNG is an extension of the PNG format, adding support for animated images.

Established standard

Supported in Microsoft Edge (Chromium)
Not currently planned in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Application Cache Deprecated Build Number 82

Enables web pages to work without the user being connected to the internet

Deprecated in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Deprecated in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
In development in Safari

ARIA Landmark Roles Supported

Support for ARIA roles indicating regions of the page intended as navigational landmarks.

Established standard

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Array.prototype.includes (ES2016) Supported Build Number 79

Method to determine whether an array includes a given element.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Arrow function (ES6) Supported Build Number 79

The arrow (=>) provides a shorthand for the function keyword with lexical 'this' binding.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
In development in Safari

ASM.js Supported Build Number 79

Performance options for a low-level subset of JavaScript, including recognition of the 'use asm' directive and ahead-of-time compilation.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
In development in Safari

Async Functions Supported Build Number 79

Async functions make it easy to write code which needs to "block" on certain asynchronous events JavaScript. Async/await does this by providing a simpler and more ergonomic way to use Promises. To block on a value, use the 'await' keyword. Async/await can be implemented based on a desugaring to generators, as described in the following design doc: https://docs.google.com/document/d/1K38ct2dsxG_9OfmgErvFld4MPDC4Wkr8tPuqmSWu_3Y/edit?usp=sharing

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
In development in Safari

Asynchronous Iterators Supported Build Number 79

Introduces the AsyncIterator interface, an asynchronous iteration statement (for-await-of), and async generator functions.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Audio Output Devices API Supported Build Number 79

The Audio Output Devices API allows a Web application to direct audio output to authorized endpoints other than the user agent default.

Editor's draft

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Audio tracks In Development Build Number 79

Adds the ability to get information about multiple audio tracks, and switch between them using the AudioTrack.enabled attributes.

Working draft or equivalent

In Development in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
In Development in Chrome
Not Supported in Firefox
Shipped in Internet Explorer 11
In development in Safari

Backdrop filter In Development

Applies a CSS filter effect to the content behind an element. This is not the element's background but the content that would be drawn behind it.

Prefixed version: Microsoft Edge build 17063+

Working draft or equivalent

In Development in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
In Development in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
In Development in Safari

background-blend-mode Supported Build Number 79

Specifies the blending mode used for each background layer

Preview in: Microsoft Edge build 17763+ by enabling in about:flags

Established standard

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Background Sync API Supported Build Number 79

Provides an API for notifying a Service Worker that the user has come back online, or to schedule periodic events to synchronize local data with the server.

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Battery Status API Supported Build Number 79

Allows access to see the battery level of the device's battery

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Beacon Supported Build Number 79

Enables web applications to asynchronously transfer data from the user agent to a web server, with the user agent taking the responsibility to eventually send the data.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Blob Supported Build Number 79

Allows you to construct Blobs directly (var blob = new Blob(["1234"], {type: 'text/plain'})). Blob() constructor also can take ArrayBufferView directly rather than constructing a blob with ArrayBuffer.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

Box Alignment In development In development

CSS properties for aligning boxes within their container. Allows for true vertical centering among other features.

In development in Microsoft Edge (Chromium)
Under Consideration in Microsoft Edge (EdgeHTML)
In development in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Brotli Compressed Data Format Supported Build Number 79

Support for the Brotli data format as an HTTP content-encoding method.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Cache API Supported Build Number 79

The Cache API consists of additional ServiceWorker APIs which allow authors to fully and conveniently manage their content caches for offline use. An origin can have multiple, named Cache objects, whose contents are entirely under the control of Service Worker scripts.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Cache-Control: Immutable Not Supported

Allows servers to identify resources that will not be updated during their freshness lifetime, thus, ensuring that a client never needs to revalidate a cached fresh resource to be certain it has not been modified.

Not Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Canvas Supported Build Number 79

Provides an API to draw 2D graphics

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

Canvas 2D ellipse Supported

Provides a method to draw arcs on a 2D canvas drawing surface.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Canvas 2D Path2D Supported

Path2D objects can be used to declare paths that are then later used on CanvasRenderingContext2D objects.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Canvas2D text decoration Not Supported No longer pursuing

Add a textDecoration attribute to canvas 2D contexts, behavior similar to existing "font" attribute: It's a DOMString, parsed the same way as corresponding CSS property (text-decoration).

Established standard

Not Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Canvas focus ring In Development Build Number 79

Adds APIs to the canvas 2D context that make it possible to draw a focus ring around a canvas path and notify the operating system of the bounding box of the focused object for accessibility.

In Development in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
In Development in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
In development in Safari

Classes (ES6) Supported Build Number 79

Syntax for declaring classes.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
In development in Safari

Clipboard API Supported

Standard APIs for interacting with the clipboard (copy/cut/paste operations). IE currently supports a legacy model for clipboard access.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Color input type Supported

Input controls for picking colors via <input type='color'>.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Compositing and Blending in Canvas 2D Supported Enabled by default

The canvas 2d context has the globalCompositeOperation attribute that is used to set the current compositing and blending operator.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Conditional Rules Supported Build Number 79

Support for the @supports at-rule and the "window.CSS.supports()" API

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
In development in Safari

Conic Gradients Supported Build Number 79

Specifies a gradient where the color stops are placed around the circumference of a circle.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Under Consideration in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
In development in Safari

Console Logging APIs Supported

APIs to log messages to a connected developer tool. Covering console.assert, console.log, console.info, console.warn, console.error, console.debug, console.dir, console.dirxml.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

console.table Supported

console.table allows the logging of tabular data to a connected developer tool.

Public discussion

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Content Security Policy Supported Build Number 79

Allows you to create an allow list of sources of trusted content, and instructs the browser to only execute or render resources from those sources.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Content Security Policy Level 2 Supported Build Number 79

An evolution of the Content Security Policy specification, allowing developers to create a whitelist of sources of trusted content, and instructing the browser to only execute or render resources from those sources.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Credential Management API Supported Build Number 79

Credential Management API describes an imperative API enabling a website to request a user’s credentials from a user agent, and to help the user agent correctly store user credentials for future use.

Supported in Microsoft Edge (Chromium)
Partial Support in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
In development in Safari

Cross-Domain Font Loading Deprecated

Increases interoperability with the web by relaxing domain and licensing metadata restrictions for EOT, WOFF, and TrueType fonts. Development work for IE is currently for Windows Phone only.

Established standard

Deprecated in Microsoft Edge (Chromium)
In Development in Microsoft Edge (EdgeHTML)
Deprecated in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

CSP Level 3 strict-dynamic source expression Supported Build Number 79

Allows script loaded via a CSP2 nonce-based or hash-based whitelist to load other script, enabling developers and site administrators to reduce their reliance on whitelists and to tighten CSP implementations.

Editor's draft

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

CSP upgrade-insecure-requests directive Supported Build Number 79

Allows a server to instruct the user agent to upgrade insecure requests via a Content-Security-Policy header. This directive is meant to make it even easier for a site administrator to move towards using all secure transports, while avoiding having to make massive updates to URLs in their web applications.

Established standard

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

CSS all shorthand Supported Build Number 79

The all property is a shorthand that resets all CSS properties except direction and unicode-bidi

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

CSS calc() Supported Build Number 79

Method of allowing calculated values for length units, i.e. width: calc(100% - 3em)

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

CSS Containment Supported Build Number 79

A primitive for isolating style, layout, and paint. This will allow web developers to opt into the various aspects of the pipeline, allowing for UA optimizations.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

CSS Contextual Reference Element Pseudo-class :scope Supported

The :scope pseudo-class represents any element that is in the contextual reference element set.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

CSS Custom Properties (a.k.a. CSS Variables) Supported Build Number 79

Introduces cascading variables as a new primitive value type that is accepted by all CSS properties, and custom properties for defining them.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

CSS Device Adaptation In Development Build Number 79

The @viewport rule, in combination with media queries, enabled web developers to optimize the layout of sites and apps for different devices with minimal effort. It generalizes the viewport meta tag to CSS, while being much simpler to understand and without the quirks that exists with the meta tag.

Preview in: by enabling in about:flags

In Development in Microsoft Edge (Chromium)
Prefixed in Microsoft Edge (EdgeHTML)
In Development in Chrome
Not Supported in Firefox
Shipped in Internet Explorer 11
Not Supported in Safari

CSS filter() image function Not Supported No active development

The function allows filtering an CSS input image with a set of filter functions. The used filter functions are the same as for the CSS filter property. The filter() function can be animated as well.

Working draft or equivalent

Not Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
In development in Safari

CSS filter(url) using SVG elements Supported Build Number 79

The function allows filtering using SVG Filter elements as the filter function.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

CSS Font Loading API Supported Build Number 79

This CSS module describes events and interfaces used for dynamically loading font resources.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
In development in Safari

CSS font-stretch Supported Build Number 79

Add support for the CSS font-stretch property.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Not Supported in Safari

CSS Gradient Midpoints Supported

Allows specifying an optional location between the color stops of a CSS gradient.

Established standard

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

CSS Grid Layout Supported Build Number 79

A two-dimensional grid-based layout system, optimized for user interface design.

Prefixed version: IE 10+, Microsoft Edge build 10240+

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

CSS image-set() Supported

Enables responsive images in CSS by specifiying multiple resolutions of an image that the browser can select from for the given situation.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

CSS initial value Supported

If the cascaded value of a property is the initial keyword, the property’s initial value becomes its specified value.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

CSS Intrinsic Sizing Supported Build Number 79

Extends the CSS sizing properties with keywords that represent content-based "intrinsic" sizes and context-based "extrinsic" sizes, allowing CSS to more easily describe boxes that fit their content or fit into a particular layout context.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Under Consideration in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
In development in Safari

CSS Level 3 attr() function Not Supported

Support the attr() function as a component value in properties applied to an element. Currently, attr() is only supported in the content property applied to pseudo-elements.

Working draft or equivalent

Not Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

CSS Logical Properties Level 1 Not Supported

Introduces logical properties and values that provide the author with the ability to control layout through logical, rather than physical, direction and dimension mappings.

Working draft or equivalent

Not Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

CSS Motion Path Supported Build Number 79

Motion paths allow authors to animate any graphical object along an author specified path.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

CSS Mutability Pseudo-classes Supported

:read-only and :read-write pseudo-classes to match elements which are considered user-alterable for the purposes of Selectors.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

CSSOM View smooth scroll API Supported Build Number 79

Adds an optional argument to existing scroll APIs that specifies whether scrolling should be smooth. Also adds a CSS property for this.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

CSS outline-offset Supported

Allows you to define an offset from the border box for your outline

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

CSS pointer-events Supported

Enables control of whether an element can receive input events from a pointing device using an API similar to the existing pointer-events property from SVG.

Documentation

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

CSS Range Pseudo-classes Supported

:in-range and :out-of-range pseudo-classes to match elements that are candidates for constraint validation, have range limitations, and are/are not suffering from underflow or overflow.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

CSS Relational Pseudo-class :has Not Supported

The relational pseudo-class, :has(), is a functional pseudo-class taking a relative selector list as an argument. Similar to jQuery’s :has() selector.

Working draft or equivalent

Not Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

CSS resize Supported

Allows one to specify whether or not an element is resizable by the user, and if so, along which axis/axes

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

CSS Scroll Snap Points Supported Build Number 79

Enables rich, customizable, and performant scrolling experiences like pagination of carousels by using snap points that enforce the scroll offsets that a scroll container may end at after a scrolling operation has completed.

Prefixed version: IE 10+, Microsoft Edge build 10240+

Supported in Microsoft Edge (Chromium)
Prefixed in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

CSS Selectors Level 4 Not Supported

Extends the selectors with :matches, :has, :not(complex selector), :dir, case insensitive attribute matching and more.

Working draft or equivalent

Not Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

CSS tab-size property Supported

The tab-size property sets the size used to render tab characters in situations where white space is preserved

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

CSS touch-action Supported Build Number 79

New CSS property to enable websites to declaratively state how touches should be handled for purposes of scrolling and zooming.

Prefixed version: IE 10+, Microsoft Edge build 10240+

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Shipped in Internet Explorer 11
Not Supported in Safari

CSS Transforms - preserve-3d Supported

Augments existing CSS 3d transforms by facilitating the construction of complex 3d scenes.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

CSS Transitions for SVG elements Supported

Allows CSS Transitions for SVG elements.

De-facto standard

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

CSS unset value Supported

If the cascaded value of a property is the ‘‘unset’#’ keyword, then if it is an inherited property, this is treated as ‘inherit’, and if it is not, this is treated as ‘initial’. This keyword effectively erases all declared values occurring earlier in the cascade, correctly inheriting or not as appropriate for the property (or all longhands of a shorthand).

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

CSS vmax unit Supported

A viewport relative length unit equal to the larger of vw (viewport width) or vh (viewport height).

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

CSS Will Change Supported Build Number 79

Adds a will-change CSS property, that can be used to signal that a particular property is likely to be changed in the future, or that an element's content is likely to change.

Established standard

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Custom Elements Supported Build Number 79

Method for registering (creating) custom elements in script (often used in Web Components).

Established standard

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Custom filters (shaders) Not Supported No longer pursuing

Filter effects are a way of processing an element’s rendering before it is displayed in the document.

Public discussion

Not Supported in Microsoft Edge (Chromium)
Not currently planned in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

<data> Element Not Supported

An HTML element which represents its content in machine-readable and human-readable formats.

Not Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

<datalist> Element Supported Build Number 79

Shows a list of pre-defined options to suggest to the user when entering an input element.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Not Supported in Safari

Date-related input types Supported Build Number 79

Input controls for picking dates via <input type='date'>,<input type='month'>, and <input type='week'>.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Default parameter (ES6) Supported Build Number 79

Allows formal parameters to be initialized with default values if no value is passed.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Destructuring (ES6) Supported Build Number 79

Destructuring assignment allows extracting data from arrays or objects using a syntax that mirrors array and object literals.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

<details>/<summary> Supported Build Number 79

Interactive widget to show/hide content. NOTE: A first implementation landed in some Preview builds of Edge, but we had to pull it off due to quality issues.

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Device Motion Supported Build Number 79

Provides access to device's physical motion.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

Device Orientation Supported Build Number 79

Provides access to device's physical orientation

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

devicePixelRatio on zoom Supported Build Number 79

Update window.devicePixelRatio on full page zoom so that it accurately portrays the ratio between css and device pixels.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Not Supported in Safari

<dialog> element for modals Supported Build Number 79

An HTML element for modal and non-modal dialog boxes

Established standard

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Digital Publishing Accessibility API Mappings Not Supported

Defines how user agents map the Digital Publishing WAI-ARIA Module markup to platform accessibility APIs.

Working draft or equivalent

Not Supported in Microsoft Edge (Chromium)
Under Consideration in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Directory Upload Not Supported

Enable directory uploading by allowing a developer to read directory contents (files and sub-directories) asynchronously and be able to identify the directory structure.

Not Supported in Microsoft Edge (Chromium)
Partial Support in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

display: contents Supported Build Number 79

"display: contents" allows you to control the box generation of an element. The element with "display: contents" won't generate any box, but its children and pseudo-elements will still do it as normal. It's like the element has been replaced by its children and pseudo-elements.

Supported in Microsoft Edge (Chromium)
Not currently planned in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

DNS Prefetch Resource Hints Supported

A link relation type used to indicate an origin that will be used to fetch required resources and that the browser should resolve as early as possible.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Not Supported in Safari

DOM3 Keyboard Events Supported Build Number 79

KeyboardEvent: keydown, keyup, keypress

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Not Supported in Safari

DOM3 mouseenter & mouseleave Events Supported Build Number 79

DOM event analog of CSS :hover psuedo-selector that fires as the mouse enters and exits the bounding box of an element (including its children).

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
In development in Safari

DOM3 Wheel Events Supported Build Number 79

Implementation of the standard DOM Level 3 WheelEvent for mouse wheel rotation.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
In development in Safari

DOM Event Constructors Supported

Replaces document.createEvent() and associated event object init methods with constructors for each event interface.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

DOM Level 3 XPath Supported

Provides simple functionality to access a DOM tree using the XPath syntax.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

DOM ParentNode methods: prepend, append, and ChildNode methods: before, after, and replaceWith Supported Build Number 79

Convenience methods for working with DOM Node trees

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

dppx Unit for the resolution Media Query Supported

One dppx unit represents the number of 'dots' in a CSS px.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Drag and Drop Directories Supported Build Number 79

Allows dragging and dropping entire folders using HTML5 Drag and Drop. Extends the DataTransferItem with a method to get a FileEntry/DirectoryEntry.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

ECMAScript Internationalization API Supported

Provides APIs for string comparison and date/time/number formatting in a locale-aware manner.

Established standard

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Not Supported in Safari

Efficient Script Yielding - setImmediate() Not Supported

Allows web applications to flush the browser event queue and receive an immediate callback.

Editor's draft

Not Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Shipped in Internet Explorer 11
Not Supported in Safari

Encoding Standard Supported Build Number 79

This specification addresses gaps so user agents do not have to reverse engineer encoding implementations.

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Encrypted Media Extensions Supported Build Number 79

Defines a common API that may be used to discover, select and interact with such systems as well as with simpler content encryption systems.

Prefixed version: IE 11, Microsoft Edge build 10240+

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

ES6 Block bindings (let, const, function) Supported Build Number 79

Allows developers to explicitly qualify access to variables within a block.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
In development in Safari

ES6 Iterators (i.e. the for-of feature) Supported Build Number 79

Iterates over iterable objects (including arrays, array-like objects, iterators and generators), invoking a custom iteration hook with statements to be executed for the value of each distinct property.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

ES6 Numeric Literals Supported Build Number 79

Allows binary and octal numeric literals using 0b101 and 0o753 respectively.

Established standard

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

ES6 Object Literal Enhancements Supported Build Number 79

Adds computed properties, concise method definitions, and short-hand for properties whose value is initialized to a same-named variable.

Established standard

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Event Listener "once" Option Supported Build Number 79

Option to mark an event listener to fire only once

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
In development in Safari

Exclusions Not Supported

Define areas inline content should avoid, and how inline content should wrap around them.

Prefixed version: IE 10+, Microsoft Edge build 10240+

Not Supported in Microsoft Edge (Chromium)
Prefixed in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Shipped in Internet Explorer 11
Not Supported in Safari

Exponentiation Operator (ES2016) Not Supported

Not Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Extended srcset and sizes support Supported Build Number 79

Extends the current implementation of the srcset attribute by adding support for the width descriptor and the sizes attribute.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Fetch API Supported Build Number 79

The Fetch specification defines requests, responses, and the process that binds them; fetching.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

FIDO U2F Not Supported No longer pursuing

FIDO Universal Second Factor API allows online services to augment the security of their existing password infrastructure by adding a strong second factor to user login via a USB or NFC device. Also see FIDO 2.0 Web APIs, a newer specification that supports additional authentication methods, such as biometrics, and can replace passwords altogether as well as provide U2F functionality.

Established standard

Not Supported in Microsoft Edge (Chromium)
Not currently planned in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

FileReader Supported Build Number 79

The FileReader object lets web applications asynchronously read the contents of files (or raw data buffers) stored on the user's computer, using File or Blob objects to specify the file or data to read.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

FileWriter Supported Build Number 79

Enables writing to files from web applications.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Filters Supported Build Number 79

Apply filter effects to arbitrary DOM elements.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

FindText API Not Supported

Provides an API for finding ranges of text in a document, with a variety of selection criteria. Similar to a user-agent's find-on-page or page-search capability.

Working draft or equivalent

Not Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

FLAC Audio Codec Supported Build Number 79

An open codec for audio.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Flexbox Supported Build Number 79

A CSS box model optimized for user interface design. The children of a flex container can be laid out in any direction and can "flex" their sizes to fill unused space and avoid overflowing the parent.

Prefixed version: IE 10+, Microsoft Edge build 10240+

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

:focus-visible pseudo-class Not Supported

Applies while an element matches the :focus pseudo-class and the user agent (browser, etc) determines via heuristics that the focus should be made evident on the element.

Working draft or equivalent

Not Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

:focus-within pseudo-class Supported Build Number 79

The :focus-within pseudo-class applies to elements for which the :focus pseudo class applies. An element also matches :focus-within if one of its descendants in the flat tree (including non-element nodes, such as text nodes) matches the conditions for matching :focus.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

font-variant longhands Supported Build Number 79

Allows authors to utilize longhand properties of font-variant-caps, font-variant-ligatures, font-variant-numeric, font-variant-alternates, font-variant-east-asian, font-variant-position for font selection and adjustments rather than utilizing lower level props such as font-feature-settings.

Editor's draft

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Font Variation Properties with OpenType Variable Font Support Supported Build Number 79

Allows multiple instances of fonts to be defined by interpolating glyph outlines along different axis.

Editor's draft

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Form attribute Supported

Attribute for associating input and submit buttons with a form.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Frame Timing Not Supported Proposed

An interface for web applications to access runtime performance information of the browser event loop.

Not Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

From-Origin header Not Supported

Allows authors to send a header of a whistelisted set of domains from the server to other origins from loaded or accessing the content

Working draft or equivalent

Not Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Fullscreen API Supported Build Number 79

Programmatically instruct content on the page to be presented in the browser's full screen (kiosk) mode. Starting in 14.14393, this is prefixed in Edge due to compatibility issues. We are working with other browser vendors to coordinate switching to an unprefixed implementation in the future.

Prefixed version: IE 11, Microsoft Edge build 10240+

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

GamePad API Supported Build Number 79

Gives JS access to a game controller via USB.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Generated Content for Paged Media Not Supported No active development

CSS properties helpful for printed publication.

Working draft or equivalent

Not Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Generators (ES6) Supported Build Number 79

A generator is a special type of function that works as a factory for iterators.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Geolocation Supported Build Number 79

Provides access to device's physical location

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

Geometry Interfaces Supported Build Number 79

This specification provides basic geometric interfaces to represent points, rectangles, quadrilaterals and transformation matrices that can be used by other modules or specifications.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Under Consideration in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Gradients Supported Build Number 79

Gradients provide a method to, over a customizable amount of space, transition from one color to another.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

Gyroscope Supported Build Number 79

Provides access to device’s rotation around its three primary axes.

Established standard

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

H.264/AVC for RTC Not Supported

Support for H.264/AVC in RTC scenarios.

De-facto standard

Not Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Hardware Concurrency Supported Build Number 79

An API for reading the system's total number of logical processors available to the user agent, up to an optional thread limit per origin.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

High Resolution Time Supported Build Number 79

Enables reliable, high-resolution timing of client-side performance.

Established standard

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
In development in Safari

High Resolution Time 2 Supported

An API that provides translation of the current sub-millisecond resolution time between origins.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

High Resolution Time 3 Not Supported

Adds performance.timeOrigin, allowing DOMHighResTimeStamps from separate Windows to be interleaved into a single timeline.

Not Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

HTMLCanvasElement toBlob method Supported Build Number 79

Creates a Blob object representing a file containing the image in the canvas, and invokes a callback with a handle to that object.

Prefixed version: IE 10+, Microsoft Edge build 10240+

Established standard

Supported in Microsoft Edge (Chromium)
Prefixed in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Not Supported in Safari

HTML Form HTTP Extensions Not Supported

An addendum to HTML5 forms extending the abilities of configuring HTTP requests through HTML markup.

Working draft or equivalent

Not Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

HTML Imports Deprecated Build Number 80

Import HTML documents into other HTML documents (often used in Web Components).

Working draft or equivalent

Deprecated in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Deprecated in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

HTML Sections in Accessibility API Supported

Exposes HTML sectioning elements (such as section, article, main, etc.) in the Accessibility API.

Established standard

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

HTTP/2 Supported Build Number 79

A faster protocol for transporting web content standardized by the IETF.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
In development in Safari

HTTP/2 Server Push Supported

HTTP/2 allows a server to pre-emptively send (or "push") responses (along with corresponding "promised" requests) to a client in association with a previous client-initiated request. This can be useful when the server knows the client will need to have those responses available in order to fully process the response to the original request.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

HTTP Client Hints Supported Build Number 79

Header for proactive content negotiation; just as the Accept header allowed clients to indicate what formats they prefer, Client Hints allow clients to indicate a list of device and agent specific preferences.

Editor's draft

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

HTTP Live Streaming (HLS) Supported

Expands our plugin-free adaptive video streaming to support the popular HLS protocol for transferring unbounded streams of multimedia data.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

HTTP Strict Transport Security (HSTS) Supported Build Number 79

Header to inform the browser to always request a given domain over SSL, reducing MITM attack surface area.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

iframe[sandbox] attribute Supported Build Number 79

Method of running external site pages with reduced privileges (i.e. no JavaScript) in iframes (<iframe sandbox="allow-same-origin allow-forms" src="..."></iframe>)

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

iframe[seamless] attribute In Development Build Number 79

The seamless attribute is used to embed an <iframe> in the calling page without scrollbars or borders (e.g. seamlessly) and with the parent document's styles applying to the embedded seamless iframe.

Established standard

In Development in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
In Development in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
In development in Safari

iframe[srcdoc] attribute Supported Build Number 79

Gives the content of an iframe as a src context to embed (e.g. <iframe seamless srcdoc="<b>Hello World</b>"></iframe>).

Established standard

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

image-rendering Supported Build Number 79

Provides a hint to the browser on which scaling algorithm should be used.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

IME API In development In development

Provides Web applications with scripted access to an IME (input-method editor).

Prefixed version: IE 11, Microsoft Edge build 10240+

Working draft or equivalent

In development in Microsoft Edge (Chromium)
Prefixed in Microsoft Edge (EdgeHTML)
In development in Chrome
Not Supported in Firefox
Shipped in Internet Explorer 11
Not Supported in Safari

<img srcset> Supported Build Number 79

Enable a responsive images solution by providing the browser multiple resources in varying resolutions for a single image.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

IndexedDB Supported Build Number 79

An asynchronous client-side storage API offering fast access to large amounts of structured data

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
In development in Safari

IndexedDB Arrays and MultiEntry Support Supported

Extends the existing IndexedDB implementation with support for compound keys, indexed array values, and multiEntry.

Established standard

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

inert attribute In Development Build Number 79

The inert attribute would allow web authors to mark parts of the DOM tree as inert: When a node is inert, then the user agent must act as if the node was absent for the purposes of targeting user interaction events, may ignore the node for the purposes of text search user interfaces (commonly known as "find in page"), and may prevent the user from selecting text in that node.

In Development in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
In Development in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Initial Letter Not Supported

Allows the author to set the size and depth at which it sinks into the surrounding text.

Working draft or equivalent

Not Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

inputmode Supported Build Number 79

The inputmode content attribute is an enumerated attribute that specifies what kind of input mechanism would be most helpful for users entering content into the form control.

Established standard

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

International input[type=email] validation Not Supported

Adding support for international email addresses that use UTF-8 characters (e.g. 伊昭傑@郵件.商務, राम@मोहन.ईन्फो)

Public discussion

Not Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Intersection Observer Supported Build Number 79

An interface to allow a web developer to asynchronously query the position of an element with respect to other elements or the global viewport.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
In development in Safari

JavaScript module import() Supported Build Number 79

Adds a function-like import() module loading syntactic form to JavaScript. Enables dynamically loading parts of a JavaScript application at runtime.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
In Development in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Karaoke Web Standard Not Supported

Provides semantic language processing for two-way communication with a remote host. This new interface creates a system-to-system forced sonic recognition on the receiving party.

Not Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

<keygen> element Deprecated

A form element for a key pair generator control. Support here indicates UI for picking keys and some transport to submit them. However, significant interoperability issues exist with the DOM interfaces and protocols for this feature.

Established standard

Deprecated in Microsoft Edge (Chromium)
Not currently planned in Microsoft Edge (EdgeHTML)
Deprecated in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Magnetometer Supported Build Number 79

Provides access to magnetic field measurements along the device's three primary axes.

Established standard

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

<main> element Supported

Semantic HTML5 element that represents the main content of the document or application.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Map (ES6) Supported Build Number 79

Map objects are simple key/value maps.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

Masks Supported Build Number 79

Allows hiding of portions of a visible elements.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
In development in Safari

matchMedia Supported Build Number 79

API for testing if a given media query will apply.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

Math Built-ins (ES6) Supported Build Number 79

Math related functions - sign, trunc, sinh, cosh, tanh, asinh, acosh, atanh, log10, log2, hypot, fround, clz32, cbrt, log1p, expm1.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
In development in Safari

MathML In development In development

An application of XML for describing mathematical notations and capturing both its structure and content.

Established standard

In development in Microsoft Edge (Chromium)
Not currently planned in Microsoft Edge (EdgeHTML)
In development in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Media Capture and Streams Supported Build Number 79

Provides access to the user's local audio and video input/output devices (getUserMedia API).

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Media Capture from Canvas Supported Build Number 79

Media Capture API can be used to capture Canvas content as MediaStream to be recorded or transmitted to remote peers.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Media Capture from HTML Media Element Supported Build Number 79

Media Capture API can be used to capture non-DRM content from mediaelement into another MediaStream.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Media Fragments Supported

Standardizes a URL fragment syntax for specifying a fragment of a media resource.

Established standard

Supported in Microsoft Edge (Chromium)
Partial Support in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Media Queries Level 4: pointer and hover Supported

Allows to query the presence and accuracy of the user's pointing input (e.g. for differentiating touch versus mouse). Additionally, allows the page to query whether the user's pointing input supports hover.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Media Queries: prefers-reduced-motion Not Supported

Used to detect if the user has requested the system minimize the amount of animation or motion it uses.

Editor's draft

Not Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Media Queries: resolution feature Supported Build Number 79

Allows to query the device pixel count per CSS unit

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Not Supported in Safari

MediaRecorder Supported Build Number 79

Encode audio and video streams in the browser.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Media Session Supported Build Number 79

Enable websites to customize media metadata so they can control the notification and lock screen UI. Also, allow them to control media in the page from outside the page, such as platform UIs and media keys.

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
In development in Safari

Media Source Extensions Supported Build Number 79

Allows appending data to an <audio>/<video> element.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Not Supported in Safari

<menu> Element Not Supported

An HTML element for toolbars and popup menus.

Established standard

Not Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
In Development in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Message Channels Supported Build Number 79

A messaging system that allows documents to communicate with each other regardless of their source domain, in a way designed to avoid cross-site scripting attacks.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

Meta Referrer Supported Build Number 79

Using the referrer metadata attribute, a document can control the behavior of the Referer HTTP header attached to requests that originate from the document.

Established standard

Supported in Microsoft Edge (Chromium)
Partial Support in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
In development in Safari

<meter> Element Supported

The HTML meter element allows representation of a scalar measurement of a known range, or fractional value, i.e. a gauge. Distinct from the progress element.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Microdata Not Supported No longer pursuing

Microdata is used to nest semantics within existing content on web pages.

Established standard

Not Supported in Microsoft Edge (Chromium)
Not currently planned in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

mix-blend-mode Supported Build Number 79

Provides a way to blend an HTML or SVG element with its backdrop

Established standard

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Modules (ES6) Supported Build Number 79

Language-level support for defining and consuming modules.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Motion JPEG (MJPG) Supported

Adds support for the MJPG video format, popular with IP cameras.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Multi-column (full support) Supported Build Number 79

Allows content to be flowed into multiple columns with a gap and a rule between them using CSS.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Shipped in Internet Explorer 11
In development in Safari

Mutation Observers Supported Build Number 79

Provides notifications when DOM nodes are rearranged or modified.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

Navigation Timing API Supported Build Number 79

Allows web applications to access timing information related to navigation and elements.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Not Supported in Safari

Network Error Logging Supported Build Number 79

This specification defines an interface to store and retrieve error data related to the previous navigations of a document.

Editor's draft

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Number Built-ins (ES6) Supported

New methods and properties on Number, including isFinite, isInteger, isSafeInteger, isNaN, EPSILON, MIN_SAFE_INTEGER, and MAX_SAFE_INTEGER.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Object Built-ins (ES6) Supported Build Number 79

New methods on Object including assign, is, getOwnPropertySymbols, and setPrototypeOf

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

object-fit and object-position (images) Supported Build Number 79

CSS properties that control the position and size of replaced content within the content box

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

object-fit and object-position (video/canvas/etc) Supported

CSS properties that control the position and size of replaced content within the content box

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Object.getOwnPropertyDescriptors Not Supported

ECMAScript proposal for Object.getOwnPropertyDescriptors.

Working draft or equivalent

Not Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Object.observe() Deprecated Build Number 79

Observe changes to JS objects.

Working draft or equivalent

Deprecated in Microsoft Edge (Chromium)
Not currently planned in Microsoft Edge (EdgeHTML)
Deprecated in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Object rest/spread properties Supported Build Number 79

Introduces analogous rest properties for object destructuring assignment and spread properties for object literals.

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

OGG Container Supported

An open multimedia container.

De-facto standard

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

ol[reversed] attribute Supported

A boolean attribute that reverses the order of an ordered list when present.

Established standard

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

onerror Exception Parameter (5th Parameter) Supported Build Number 79

Unhandled exceptions trigger the 'window.onerror' callback (or 'self.onerror' inside Workers) for centralized handling. The 5th parameter will have the exception itself.

Established standard

Supported in Microsoft Edge (Chromium)
Under Consideration in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

oninvalid event handler Supported

Provides specified alert text if an input element is invalid.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Opus Audio Playback Supported Build Number 79

An open codec for audio playback.

Established standard

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Orientation Sensor Supported Build Number 79

Provides access to device’s physical orientation in WebGL-compatible quaternion and rotation matrix representations.

Established standard

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Origin-Signed HTTP Exchanges Supported Build Number 79

Allows sites to send HTTP request+response pairs (exchanges) that are authoritative for an origin, even when the server itself is not authoritative for that origin.

Editor's draft

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

<output> Element Supported

An HTML element for representing the result of a calculation or user action.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Page Visibility API Supported Build Number 79

Provides an API to ask whether the current tab is visible or not. If so, you might want to throttle back action or set an idle state.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

Passive Event Listeners Supported Build Number 79

Provides an API to mark event listeners as "passive", primarily to allow for scrolling performance improvements

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Payment Handler API Supported Build Number 79

A web standard way to help payment providers create and grow an ecosystem to simplify handling and processing payments on the web for developers and merchants.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Payment Request API Supported Build Number 79

A web API to allow merchants (i.e. web sites selling physical or digital goods) to easily accept payments from different payment methods with minimal integration.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
In development in Safari

Performance Observer Supported Build Number 79

An interface to observe the performance timeline (https://w3c.github.io/performance-timeline) and receive notifications of new performance entries as they are recorded.

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

<picture> Element Supported Build Number 79

Enable a responsive images solution by declaring multiple resources for an image using CSS media queries.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Picture-in-Picture Supported Build Number 79

An API for allowing websites to create a floating video window always on top of other windows so that users may continue consuming media while they interact with other content sites, or applications on their device.

Editor's draft

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Platform for Privacy Preferences 1.0 (P3P 1.0) Not Supported

The Platform for Privacy Preferences Project (P3P) enables web sites to express their privacy practices in a standard format allowing user agents to automate decision-making based on these practices when appropriate.

Established standard

Not Supported in Microsoft Edge (Chromium)
Deprecated in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Deprecated in Internet Explorer 11
Not Supported in Safari

Pointer Events Supported Build Number 79

Unified pointer input API (e.g. mouse, pen, touch input) which addresses several existing problems (especially on touchscreen laptops) and provides future extensibility.

Prefixed version: IE 10+, Microsoft Edge build 10240+

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

Pointer Lock (Mouse Lock) Supported Build Number 79

Gives access to raw mouse movement, locks the target of mouse events to a single element, eliminates limits of how far mouse movement can go in a single direction, and removes the cursor from view. Obvious use cases are for first person or real time strategy games.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

position: sticky Supported Build Number 79

position: sticky is a new way to position elements and is conceptually similar to position: fixed. The difference is that a stickily positioned element behaves like position: relative within its parent, until a given offset threshold is met.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

postMessage Supported Build Number 79

Safely enables cross-origin communication.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

Preconnect Resource Hints Supported Build Number 79

A link relation type used to indicate an origin that will be used to fetch required resources, so the browser can open a connection early for resouces that will be required later in the loading process.

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Prefetch Resource Hints Supported

Indicates the browser should preemptively fetch and cache the specified resource.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Not Supported in Safari

Preload Supported Build Number 79

A keyword that may be used with "link" elements which provides a declarative fetch primitive that initiates an early fetch and separates fetching from resoruce execution.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
In development in Safari

Prerender Resource Hints Supported

Provides a hint to the browser that another page is likely to be loaded by the user (such as the first result of a search) such that it may be prerendered for better performance.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Shipped in Internet Explorer 11
Not Supported in Safari

Promise.prototype.finally Supported Build Number 79

Registers a callback to be invoked when a promise is settled (whether it is fulfilled or rejected), allowing for cleanup of pending or ongoing actions depending on that promise.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Promises (ES6) Supported Build Number 79

Allows easier and cleaner asynchronous coding. Adds the Promise constructor, along with the 'all' and 'race' utility methods to the language itself.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

__proto__ (ES6) Supported

Support for legacy prototype manipulation similar to Object.setPrototypeOf.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

Proxies (ES6) Supported Build Number 79

Proxies are objects for which the programmer has to define the semantics in JavaScript.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Public Key Pinning Extension for HTTP Supported Build Number 79

Certificate public key pinning is a mechanism which allows specifying a key that must be present in the certificate chain associated with a domain name. HTTP Public Key Pinning (HPKP) is one way of doing certificate public key pinning. In this method, site owner defines pin rules for his domain name via HTTP header. This mechanism assumes that user has had a first clean connection to the site.

Established standard

Supported in Microsoft Edge (Chromium)
Under Consideration in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Push API Supported Build Number 79

Provides webapps with scripted access to server-sent notifications.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Quota Management API Supported Build Number 79

This API can be used to check how much quota an app/origin is using.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not currently planned in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Reflect (ES6) Supported Build Number 79

Provides methods for use in operations that are intercepted. Reflect methods are often used with proxies because they allow you to delegate to default behavior without implementing the default behavior in your code.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
In development in Safari

RegExp Built-ins (ES6) Not Supported

New methods on RegExp.prototype including match, replace, search, and split.

Preview in: Microsoft Edge build 14342+ by enabling in about:flags

Established standard

Not Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Regions Not Supported No longer pursuing

Magazine-like content flow into specified regions.

Prefixed version: IE 10+, Microsoft Edge build 10240+

Working draft or equivalent

Not Supported in Microsoft Edge (Chromium)
Prefixed in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

requestAnimationFrame() Supported Build Number 79

Offload animation repainting to browser for optimized performance. You should call this method whenever you're ready to update your animation onscreen. This will request that your animation function be called before the browser performs the next repaint.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

requestIdleCallback Supported Build Number 79

Allows developers to cooperatively schedule background tasks to avoid introducing delays with high priority tasks in the same event loop.

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Resize Observer Supported Build Number 79

Allows a web developer to attach an observer to an element and a callback will be fired when that element is resized

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
In development in Safari

Resource Timing API Supported Build Number 79

Allows web applications to access timing information related to HTML elements.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Shipped in Internet Explorer 11
Not Supported in Safari

Rest parameters (ES6) Supported Build Number 79

Allows representation of an indefinite number of arguments as an array.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

RTC Data Channels Supported

Data channels allow a web application to send and receive generic application data peer-to-peer.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Same-site cookies Supported Build Number 79

Defines a SameSite attribute, allowing a server to specify that cookies should not be sent with cross-site requests. NOTE: IE11 on build 16299+ also support this feature if all updates are applied to the OS

Editor's draft

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Scoped Styles Deprecated Build Number 79

Boolean attribute for the <style> element (<style scoped>). When present, its styles only apply to the parent element.

Working draft or equivalent

Deprecated in Microsoft Edge (Chromium)
Not currently planned in Microsoft Edge (EdgeHTML)
Deprecated in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Screen Capture Not Supported

Screen Capture API allows a user's display or parts thereof be used as the source of a media stream. NOTE: This feature works only on Window 10 Pro and Enterprise editions.

Working draft or equivalent

Not Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
In Development in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Screen Orientation API Supported Build Number 79

Provides the ability to read the screen orientation state, to be informed when this state changes, and to be able to lock the screen orientation to a specific state.

Prefixed version: IE 11, Microsoft Edge build 10240+

Supported in Microsoft Edge (Chromium)
Prefixed in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Not Supported in Safari

Secure Contexts In development In development

As the web enables more powerful apps, features which enable those apps should only be enabled in contexts which meet a specific security level. This also exposes the APIs that identify if you’re in a secure context.

Working draft or equivalent

In development in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
In development in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Selection API Supported

Based on APIs from HTML5 and DOM Range, this specification includes additional methods for programmatically inspecting and modifying the selection.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

selectionDirection attribute on text input elements Supported

Returns the string corresponding to the current selection direction on text input elements: "forward", "backward", or "none".

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Server-Sent Events (EventSource) Supported Build Number 79

Enables push notifications from the server received as DOM events.

Established standard

Supported in Microsoft Edge (Chromium)
Under Consideration in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Server Timing Not Supported

Enables the server to communicate request-response cycle metrics to the user agent, and provides a JavaScript interface to enable applications to access and act on those metrics.

Working draft or equivalent

Not Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Service Worker Supported Build Number 79

ServiceWorkers (formerly Navigation Controllers) are a new system that provides event-driven scripts that run independent of web pages. They are similar to SharedWorkers except that their lifetime is different and they have access to domain-wide events such as network fetches.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Set (ES6) Supported Build Number 79

Set objects let you store unique values of any type, whether primitive values or object references.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

Shadow DOM Supported Build Number 79

Enables DOM tree encapsulation. Without it, widgets may inadvertently break pages by using conflicting CSS selectors, class or id names, or JavaScript variables (often used in Web Components).

Established standard

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
In development in Safari

Shapes Supported Build Number 79

Define arbitrary shapes inside and around which inline content can flow.

Established standard

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
In development in Safari

Shared Memory and Atomics Supported Build Number 79

Shared memory and atomics for ECMAscript.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Shared Web Workers Supported

A special type of WebWorker that can commincate across windows/tabs for a site.

Established standard

Supported in Microsoft Edge (Chromium)
Not currently planned in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

showModalDialog Deprecated Build Number 79

The global showModalDialog() method displays a modal dialog box containing a specified HTML document. This feature has an incredibly high cost in terms of code complexity since it requires us to run an event loop on top of an arbitrary JavaScript stack. It also complicates the web platform by making task dispatch reentrant and hard to reason about.

Established standard

Deprecated in Microsoft Edge (Chromium)
Deprecated in Microsoft Edge (EdgeHTML)
Deprecated in Chrome
Not Supported in Firefox
Deprecated in Internet Explorer 11
Not Supported in Safari

SIMD In Development

Enables Single Instruction, Multiple Data instructions to be used from Javascript programs.

Preview in: Microsoft Edge build 10240+ by enabling in about:flags

Editor's draft

In Development in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
In Development in Chrome
In Development in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

SPDY/3 Supported Build Number 79

A faster protocol for transporting web content.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Deprecated in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Deprecated in Internet Explorer 11
In development in Safari

Spread (ES6) Supported Build Number 79

The spread operator expands iterable expressions into individual arguments. For example, a.b(…array) is roughly the same as a.b.apply(a, array).

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Streams API: ReadableStream Supported Build Number 79

A readable stream represents a source of data, from which you can read.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Streams API: WritableStream Supported Build Number 79

A writable stream represents a destination for data, into which you can write.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

String Built-ins (ES6) Supported

New methods on String including String.raw and String.fromCodePoint. New methods on String.prototype including codePointAt, normalize, repeat, startsWith, endsWith, and includes.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Subclassing (ES6) Supported

Allows subclassing of built-in types such as Dates and Arrays.

Prefixed version: Microsoft Edge build 14279+

Established standard

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Subpixel font scaling Supported Build Number 79

Allow sub-css-pixel font-sizes and thus smooth font scaling.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Not Supported in Safari

Subresource Integrity Supported Build Number 79

Subresource Integrity defines a mechanism by which user agents may verify that a fetched resource has been delivered without unexpected manipulation. In a nutshell, metadata inlined into HTML elements allows the browser to determine whether the resource that was downloaded matches the resource the page's author expected to download.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Support CSS transforms on SVG Supported

Enable support for CSS transforms on elements and presentational attributes of SVG

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Support dataset property on SVGElement Supported Build Number 79

The dataset IDL attribute provides access to custom data attributes on SVG elements. Its behavior is the same as the corresponding IDL member on the HTMLElement interface.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

SVG2 In development In development

Implement the new SVG2 features.

Working draft or equivalent

In development in Microsoft Edge (Chromium)
Partial Support in Microsoft Edge (EdgeHTML)
In development in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
In development in Safari

SVG Accessibility API Mappings Not Supported

Defines how user agents map SVG markup to platform accessibility application programming interfaces.

Working draft or equivalent

Not Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

SVG External Content Supported

Allows referencing external content in SVG. A common use case for this would be <use xlink:href="lib.svg#template" fill="#000000"></use>

Established standard

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

SVG foreignobject element Supported

Allows for inclusion of a foreign namespace (such as HTML) which has its graphical content drawn by a different user agent

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

SVG+SMIL Animation Supported

XML-based syntax for specifying animations of SVG.

Established standard

Supported in Microsoft Edge (Chromium)
Not currently planned in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Symbols (ES6) Supported Build Number 79

Allows properties to be added to existing objects without the possibility of interference with the existing properties, unintended visibility, or with other uncoordinated additions by any other code.

Established standard

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Tail Calls (ES6) Not Supported No longer pursuing

Enables boundlessly recursive algorithms (using constant stack space) for certain code patterns.

Established standard

Not Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

<template> Element Supported Build Number 79

HTML template element to allow creating fragment of inert HTML as a prototype for stamping out DOM (often used in Web Components).

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Template Strings (ES6) Supported Build Number 79

String literals that allow for expressions to be evaluated and concatenated with the string literal.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Theora Video Codec Supported

An open video codec.

De-facto standard

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

<time> Element Not Supported

An HTML element for representing dates and times.

Not Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Time-related input types Supported Build Number 79

Input controls for picking times via <input type='time'>, and <input type='datetime-local'>.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

TLS 1.2 Supported Build Number 79

The latest version of the Transport Layer Security (TLS) protocol. Allows for data/message confidentiality, and message authentication codes for message integrity and as a by-product message authentication.

Established standard

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

TLS 1.3 Supported Build Number 79

Transport Layer Security (TLS) protocol version 1.3 allows faster and more secure connection compared to TLS 1.2 by reducing round trip number, and removing legacy vulnerable cryptography features.

Established standard

Supported in Microsoft Edge (Chromium)
Provided-by-underlying-OS in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
In development in Safari

Touch-action: pan-up pan-down pan-left pan-right CSS properties Supported Build Number 79

Adds additional direction-specific values for the CSS touch-action property for pan-up, pan-down, pan-left, pan-right have been added to the specification.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Touch Events Supported Build Number 79

Touchscreen input API, originally introduced by Apple on iOS. Support is currently limited to only devices with a touchscreen (can be overridden in about:flags). See Pointer Events for touch, pen, and mouse input across all device types.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Track element Supported Build Number 79

Add subtitles, captions, screen reader descriptions, chapters and other types of timed metadata to video and audio.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

Transforms Supported Build Number 79

Enables changing the position of content in 3D space without disrupting the normal flow. See also preserve-3d.

Prefixed version: IE 9+, Microsoft Edge build 10240+

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

Typed Arrays (ES6) Supported Build Number 79

Buffers for holding binary data and working with WebGL & Audio API: ArrayBuffer, Float32Array , Int16Array, Uint8Array, etc.)

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

UIEvents - Keyboard Query APIs Not Supported No longer pursuing

Identify the physical key being pressed; Query key from layout.

Editor's draft

Not Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

URL API Supported Build Number 79

Expose constructible URL objects that can be manipulated and combined.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

URLSearchParams Supported Build Number 79

Allows developers to manipulate the search params of a URL.

Established standard

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

User Timing API Supported Build Number 79

Helps web developers measure the performance of their applications by giving them access to high precision timestamps.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Not Supported in Safari

Vibration API Supported Build Number 79

This specification defines an API that provides access to the vibration mechanism of the hosting device. Vibration is a form of tactile feedback.

Established standard

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Video tracks In Development Build Number 79

Adds the ability to get information about multiple video tracks, and switch between them using the VideoTrack.selected attributes.

Working draft or equivalent

In Development in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
In Development in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
In development in Safari

Vorbis Audio Codec Supported

An open codec for audio.

De-facto standard

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

VP8 for RTC Not Supported

Support for the VP8 video format in RTC scenarios.

De-facto standard

Not Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Not Supported in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

VP9 Video Playback Supported Build Number 79

An open codec for video optimized on the web. In the current release, VP9 is only automatically enabled when hardware acceleration is detected. VP9 support can be toggled manually via about:flags.

De-facto standard

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

WAV Audio Support Supported

Enables PCM WAV audio support in HTML5 Audio.

De-facto standard

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

WeakMap (ES6) Supported Build Number 79

WeakMaps are key/value maps in which keys are objects.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

WeakSet (ES6) Supported Build Number 79

Contains a set of objects such that those objects will be collected if they are not referenced anywhere else.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Web Animations JavaScript API Supported Build Number 79

A unified model for supporting animation and synchronization on the Web platform.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
In development in Safari

Web Application Manifest Supported Build Number 79

This specification defines a JSON-based manifest, which provides developers with a centralized place to put metadata associated with a web application. On Windows 10, we support submitting web apps with a manifest to the Microsoft Store using packaging tools like PWA Builder or Visual Studio, and are previewing proactive indexing of published PWAs via the Bing crawler.

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
In development in Safari

Web Assembly (MVP) Supported Build Number 79

WebAssembly or wasm is a new portable, size- and load-time-efficient format suitable for compilation to the web.

Documentation

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Web Audio API Supported Build Number 79

A high-level JavaScript API for processing and synthesizing audio in web applications

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Shipped in Safari

Web Authentication API Supported

Web Authentication provides an open, scalable, and interoperable solution to facilitate authentication, which replaces passwords with stronger hardware-bound credentials. The implementation in Microsoft Edge allows users to use Windows Hello (via PIN or biometrics) and external authenticators like FIDO2 Security Keys or FIDO U2F Security Keys, to securely authenticate to websites. This updates our previous implementation to match the updated spec and to be unprefixed and enabled by default.

Editor's draft

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Web Bluetooth Supported Build Number 79

An API for communicating with Bluetooth Low Energy devices as a GATT Client.

Editor's draft

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Not Supported in Firefox
Not Supported in Internet Explorer 11
Not Supported in Safari

Web Crypto API Supported Build Number 79

JavaScript bindings for cryptographic operations. Note: we are looking to update our current implementation to the latest W3C Last Call Working Draft specification.

Prefixed version: IE 11, Microsoft Edge build 10240+

Supported in Microsoft Edge (Chromium)
Prefixed in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
In development in Safari

WebDriver Supported

A platform and language-neutral interface and associated wire protocol that allows programs or scripts to introspect into, and control the behaviour of, a web browser.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

WebGL 2.0 Supported Build Number 79

An update to WebGL, based on OpenGL ES 3.0

Working draft or equivalent

Supported in Microsoft Edge (Chromium)
Not Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
In development in Firefox
Not Supported in Internet Explorer 11
In development in Safari

WebGL (Canvas 3D) Supported Build Number 79

3D rendering via the <canvas> element.

Prefixed version: IE 11, Microsoft Edge build 10240+

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
In development in Safari

WebGL Instancing Extension Supported

A way to use the GPU to quickly draw a lot of copies of a single object. In some scenes (like a forest with a lot of trees) it is a great way to get a huge performance improvement. Requires a compatible GPU.

Supported in Microsoft Edge (Chromium)
Supported in Microsoft Edge (EdgeHTML)
Shipped in Chrome
Shipped in Firefox
Shipped in Internet Explorer 11
Shipped in Safari

WebGL Shared Resources Not Supported No longer pursuing

Allow sharing resources between 2 or more WebGL contexts

Established standard

Not Supported in Microsoft Edge (Chromium)
Under Consideration in Microsoft Edge (EdgeHTML)
Not Supported in Chro