Features missing in just one engine

These web features are not yet available, one browser engine has not implemented it yet.

• accent-color

  Limited availability

  Tags: css Groups: CSS

  The accent-color CSS property sets a color for checkboxes, radio buttons, and other form controls.

  Learn more

  Baseline availability blocked since September 2021 by Safari (38 months)

  • Chrome 93 Released on 2021-08-31
  • Chrome Android 93 Released on 2021-08-31
  • Edge 93 Released on 2021-09-02
  • Firefox 92 Released on 2021-09-07
  • Firefox for Android 92 Released on 2021-09-07
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• alignment-baseline

  Limited availability

  Tags: css Groups: CSS > Text

  The alignment-baseline CSS property sets which baseline of an element is aligned with the corresponding baseline of its parent.

  Learn more

  Baseline availability blocked since February 2020 by Firefox (57 months)

  • Chrome ≤80 Released before 2020-02-04
  • Chrome Android 80 Released on 2020-02-04
  • Edge 80 Released on 2020-02-07
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari ≤13.1 Released before 2020-03-24
  • Safari on iOS ≤13.4 Released before 2020-03-24

• Asynchronously iterable streams

  Limited availability

  Tags: api Groups: Streams

  Asynchronous iteration of a stream allows you to use for await … of loops to iterate through a stream's incoming data.

  Learn more

  Baseline availability blocked since April 2024 by Safari (7 months)

  • Chrome 124 Released on 2024-04-16
  • Chrome Android 124 Released on 2024-04-16
  • Edge 124 Released on 2024-04-18
  • Firefox 110 Released on 2023-02-14
  • Firefox for Android 110 Released on 2023-02-14
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• Atomics.waitAsync

  Limited availability

  Tags: javascript Groups: JavaScript

  The Atomics.waitAsync() static method waits for a value in a shared memory location, providing a promise when the expected value is not yet in memory. The waitAsync() method is a non-blocking alternative to Atomics.wait().

  Learn more

  Baseline availability blocked since March 2023 by Firefox (20 months)

  • Chrome 87 Released on 2020-11-17
  • Chrome Android 89 Released on 2021-03-02
  • Edge 87 Released on 2020-11-19
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 16.4 Released on 2023-03-27
  • Safari on iOS 16.4 Released on 2023-03-27

• background-clip: text

  Limited availability

  Tags: css Groups: CSS > Background

  The background-clip: text CSS declaration draws the background underneath only the text in the element.

  Learn more

  Baseline availability blocked since December 2023 by Firefox (11 months)

  • Chrome 120 Released on 2023-12-05
  • Chrome Android 120 Released on 2023-12-05
  • Edge 120 Released on 2023-12-07
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 14 Released on 2020-09-16
  • Safari on iOS 14 Released on 2020-09-16

• BarProp

  Limited availability

  Tags: api

  The visible property of the window.locationbar, window.menubar, window.personalbar, window.scrollbars, window.statusbar, and window.toolbar APIs historically represented the visibility of a browser user interface. For privacy reasons, it now represents whether the window is a pop-up.

  Learn more

  Baseline availability blocked since February 2022 by Safari (33 months)

  • Chrome 98 Released on 2022-02-01
  • Chrome Android 98 Released on 2022-02-01
  • Edge 98 Released on 2022-02-03
  • Firefox 96 Released on 2022-01-11
  • Firefox for Android 96 Released on 2022-01-11
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• baseline-shift

  Limited availability

  Tags: css Groups: CSS > Text

  The baseline-shift CSS property sets the position of an element relative to its dominant baseline.

  Learn more

  Baseline availability blocked since February 2020 by Firefox (57 months)

  • Chrome ≤80 Released before 2020-02-04
  • Chrome Android 80 Released on 2020-02-04
  • Edge 80 Released on 2020-02-07
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari ≤13.1 Released before 2020-03-24
  • Safari on iOS ≤13.4 Released before 2020-03-24

• baseline-source

  Limited availability

  Tags: css

  The baseline-source CSS property controls how inline-level boxes with multiple lines of text are aligned with the surrounding text. By default, which typographic baseline is used depends on the display property value.

  Learn more

  Baseline availability blocked since July 2023 by Safari (16 months)

  • Chrome 111 Released on 2023-03-07
  • Chrome Android 111 Released on 2023-03-07
  • Edge 111 Released on 2023-03-13
  • Firefox 115 Released on 2023-07-04
  • Firefox for Android 115 Released on 2023-07-04
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• Beforeunload

  Limited availability

  Tags: api

  The beforeunload event is fired when the current window is about to be unloaded. Typically this is used to display a dialog to confirm if users really want to leave the page when there is unsaved data that would be lost.

  Learn more

  Baseline availability blocked since November 2023 by Safari on iOS (12 months)

  • Chrome 119 Released on 2023-10-31
  • Chrome Android 119 Released on 2023-10-31
  • Edge 119 Released on 2023-11-02
  • Firefox 6 Released on 2011-08-16
  • Firefox for Android 6 Released on 2011-08-16
  • Safari 11 Released on 2017-09-19
  • Safari on iOS ❌ Search for bugs Search for standards position

• box-decoration-break

  Limited availability

  Tags: css

  The box-decoration-break CSS property sets whether box decorations, such as borders or backgrounds, of an element divided across a page, column, or region wraps each fragment or splits across the break.

  Learn more

  Baseline availability blocked since October 2024 by Safari (1 months)

  • Chrome 130 Released on 2024-10-15
  • Chrome Android 130 Released on 2024-10-15
  • Edge 130 Released on 2024-10-17
  • Firefox 32 Released on 2014-09-02
  • Firefox for Android 32 Released on 2014-09-02
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• 2D canvas opacity

  Limited availability

  Tags: api Groups: Canvas

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

  Learn more

  Baseline availability blocked since June 2014 by Safari (125 months)

  • Chrome 32 Released on 2014-01-14
  • Chrome Android 32 Released on 2014-01-15
  • Edge ≤79 Released before 2020-01-15
  • Firefox 30 Released on 2014-06-10
  • Firefox for Android 30 Released on 2014-06-10
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• Color management for 2D canvas

  Limited availability

  Tags: api Groups: Canvas

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

  Learn more

  Baseline availability blocked since December 2021 by Firefox (35 months)

  • Chrome 92 Released on 2021-07-20
  • Chrome Android 92 Released on 2021-07-20
  • Edge 92 Released on 2021-07-22
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 15.2 Released on 2021-12-13
  • Safari on iOS 15.2 Released on 2021-12-13

• Desynchronized 2D canvas

  Limited availability

  Tags: api Groups: Canvas

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

  Learn more

  Baseline availability blocked since September 2021 by Firefox (38 months)

  • Chrome 81 Released on 2020-04-07
  • Chrome Android 75 Released on 2019-06-04
  • Edge 79 Released on 2020-01-15
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 15 Released on 2021-09-20
  • Safari on iOS 15 Released on 2021-09-20

• contextlost and contextrestored

  Limited availability

  Tags: api Groups: Canvas

  The contextlost event for <canvas> fires when the canvas backing storage is lost, while the contextrestored event fires when it is recreated.

  Learn more

  Baseline availability blocked since April 2024 by Safari (7 months)

  • Chrome 99 Released on 2022-03-01
  • Chrome Android 99 Released on 2022-03-01
  • Edge 99 Released on 2022-03-03
  • Firefox 125 Released on 2024-04-16
  • Firefox for Android 125 Released on 2024-04-16
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• Animatable clipping paths

  Limited availability

  Tags: css Groups: Clipping, shapes and masking

  The clip-path property can be animated using CSS transitions and animations.

  Learn more

  Baseline availability blocked since January 2020 by Safari (58 months)

  • Chrome 55 Released on 2016-12-01
  • Chrome Android 55 Released on 2016-12-06
  • Edge 79 Released on 2020-01-15
  • Firefox 49 Released on 2016-09-20
  • Firefox for Android 49 Released on 2016-09-20
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• ClipboardItem.supports()

  Limited availability

  Tags: api Groups: Clipboard

  The ClipboardItem.supports() static method checks if the browser supports writing data types such as "image/svg+xml" or other custom formats to the system clipboard.

  Learn more

  Baseline availability blocked since June 2024 by Safari (5 months)

  • Chrome 121 Released on 2024-01-23
  • Chrome Android 121 Released on 2024-01-23
  • Edge 121 Released on 2024-01-25
  • Firefox 127 Released on 2024-06-11
  • Firefox for Android 127 Released on 2024-06-11
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• COLRv1

  Limited availability

  Tags: css Groups: CSS > Fonts

  COLRv1 is a font format that supports multi-color glyphs. COLRv1 extends COLRv0 to support gradients, transforms, and blending modes.

  Learn more

  Baseline availability blocked since November 2022 by Safari (24 months)

  • Chrome 98 Released on 2022-02-01
  • Chrome Android 98 Released on 2022-02-01
  • Edge 98 Released on 2022-02-03
  • Firefox 107 Released on 2022-11-15
  • Firefox for Android 107 Released on 2022-11-15
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• Container style queries

  Limited availability

  Tags: css Groups: CSS > Containment

  Container style queries with the @container at-rule apply styles to an element based on the values of custom properties of its container.

  Learn more

  Baseline availability blocked since September 2024 by Firefox (2 months)

  • Chrome 111 Released on 2023-03-07
  • Chrome Android 111 Released on 2023-03-07
  • Edge 111 Released on 2023-03-13
  • Firefox ❌ See bugzil.la/1795622
  • Firefox for Android ❌ See bugzil.la/1795622
  • Safari 18 Released on 2024-09-16
  • Safari on iOS 18 Released on 2024-09-16

• context-fill and context-stroke

  Limited availability

  Tags: svg Groups: SVG

  The context-fill and context-stroke CSS values are used with fill and stroke in SVG <marker> or <use> elements to match a color from where they appear.

  Learn more

  Baseline availability blocked since April 2024 by Safari (7 months)

  • Chrome 124 Released on 2024-04-16
  • Chrome Android 124 Released on 2024-04-16
  • Edge 124 Released on 2024-04-18
  • Firefox 111 Released on 2023-03-14
  • Firefox for Android 111 Released on 2023-03-14
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• createImageBitmap

  Limited availability

  Tags: api

  The createImageBitmap() global method creates an ImageBitmap object from a source such as an image, SVG, blob, or canvas. An ImageBitmap object represents pixel data that can be drawn to a canvas with lower latency than other types, such as ImageData.

  Learn more

  Baseline availability blocked since December 2023 by Firefox (11 months)

  • Chrome 66 Released on 2018-04-17
  • Chrome Android 66 Released on 2018-04-17
  • Edge 79 Released on 2020-01-15
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 17.2 Released on 2023-12-11
  • Safari on iOS 17.2 Released on 2023-12-11

• CSS typed object model

  Limited availability

  Tags: api Groups: CSS > CSS object models

  The CSSStyleValue and its subclasses represent CSS values as distinct types instead of only strings. Also known as typed OM.

  Learn more

  Baseline availability blocked since March 2023 by Firefox (20 months)

  • Chrome 66 Released on 2018-04-17
  • Chrome Android 66 Released on 2018-04-17
  • Edge 79 Released on 2020-01-15
  • Firefox ❌ See bugzil.la/1278697
  • Firefox for Android ❌ See bugzil.la/1278697
  • Safari 16.4 Released on 2023-03-27
  • Safari on iOS 16.4 Released on 2023-03-27

• Cursor styles

  Limited availability

  Tags: css svg Groups: CSS

  The cursor CSS property styles the pointer, allowing you to provide hints to the user on how to interact with the hovered element.

  Learn more

  Baseline availability blocked since December 2021 by Safari on iOS (35 months)

  • Chrome ≤83 Released before 2020-05-19
  • Chrome Android 83 Released on 2020-05-19
  • Edge 83 Released on 2020-05-21
  • Firefox ≤72 Released before 2020-01-07
  • Firefox for Android 95 Released on 2021-12-07
  • Safari ≤13.1 Released before 2020-03-24
  • Safari on iOS ❌ Search for bugs Search for standards position

• Customized built-in elements

  Limited availability

  Tags: api html Groups: HTML > Custom elements

  Customized built-in elements are HTML elements that extend built-in elements using the is attribute, to add new behaviors that you define.

  Learn more

  Baseline availability blocked since January 2020 by Safari (58 months)

  • Chrome 67 Released on 2018-05-29
  • Chrome Android 67 Released on 2018-05-31
  • Edge 79 Released on 2020-01-15
  • Firefox 63 Released on 2018-10-23
  • Firefox for Android 63 Released on 2018-10-23
  • Safari ❌ See webkit.org/b/182671
  • Safari on iOS ❌ See webkit.org/b/182671

• <datalist>

  Limited availability

  Tags: api html Groups: HTML > Forms

  The <datalist> element sets recommended values for an <input> element. Browsers may show a dropdown menu of all values or match values as the user types.

  Learn more

  Baseline availability blocked since February 2023 by Firefox for Android (21 months)

  • Chrome 69 Released on 2018-09-04
  • Chrome Android 69 Released on 2018-09-04
  • Edge 12 Released on 2015-07-29
  • Firefox 110 Released on 2023-02-14
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 12.1 Released on 2019-03-25
  • Safari on iOS 12.2 Released on 2019-03-25

• display animation

  Limited availability

  Tags: css Groups: CSS

  You can animate elements between display: none and any other display value or animate between content-visibility: hidden and any other content-visibility value. This also applies to transitions.

  Learn more

  Baseline availability blocked since September 2024 by Firefox (2 months)

  • Chrome 117 Released on 2023-09-12
  • Chrome Android 117 Released on 2023-09-12
  • Edge 117 Released on 2023-09-15
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 18 Released on 2024-09-16
  • Safari on iOS 18 Released on 2024-09-16

• document.caretPositionFromPoint()

  Limited availability

  Tags: api

  The document.caretPositionFromPoint() method finds an insertion point, represented by a DOM node and an offset within that node, for given coordinates in the viewport.

  Learn more

  Baseline availability blocked since August 2024 by Safari (3 months)

  • Chrome 128 Released on 2024-08-20
  • Chrome Android 128 Released on 2024-08-20
  • Edge 128 Released on 2024-08-22
  • Firefox 20 Released on 2013-04-02
  • Firefox for Android 20 Released on 2013-04-02
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• Event timing

  Limited availability

  Tags: api Groups: Performance

  The event and first-input performance entries and the PerformanceEventTiming API measures the latency of user input events, such as mouse clicks or keypresses, and the latency of the first user input. First Input Delay (FID) is a common metric for perceived responsiveness.

  Learn more

  Baseline availability blocked since June 2021 by Safari (41 months)

  • Chrome 76 Released on 2019-07-30
  • Chrome Android 76 Released on 2019-07-30
  • Edge 79 Released on 2020-01-15
  • Firefox 89 Released on 2021-06-01
  • Firefox for Android 89 Released on 2021-06-01
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• EXT_float_blend WebGL extension

  Limited availability

  Tags: api Groups: WebGL > WebGL extensions

  The EXT_float_blend extension for WebGL 1.0 and 2.0 contexts adds 32-bit floating-point components to blending and draw buffers.

  Learn more

  Baseline availability blocked since April 2021 by Safari on iOS (43 months)

  • Chrome 75 Released on 2019-06-04
  • Chrome Android 75 Released on 2019-06-04
  • Edge 79 Released on 2020-01-15
  • Firefox 67 Released on 2019-05-21
  • Firefox for Android 67 Released on 2019-05-21
  • Safari 14.1 Released on 2021-04-26
  • Safari on iOS ❌ Search for bugs Search for standards position

• EXT_texture_norm16c WebGL extension

  Limited availability

  Tags: api Groups: WebGL > WebGL extensions

  The EXT_texture_norm16 extension to WebGL 2.0 contexts adds 16 bit signed normalized and unsigned normalized fixed-point texture, renderbuffer, and texture buffer formats.

  Learn more

  Baseline availability blocked since September 2022 by Firefox (26 months)

  • Chrome 87 Released on 2020-11-17
  • Chrome Android 87 Released on 2020-11-17
  • Edge 87 Released on 2020-11-19
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 16 Released on 2022-09-12
  • Safari on iOS 16 Released on 2022-09-12

• Fetch priority

  Limited availability

  Tags: api html http

  The fetch() priority option and the fetchPriority HTML attribute give hints to the browser about which requests to do before other requests of the same type.

  Learn more

  Baseline availability blocked since December 2023 by Firefox (11 months)

  • Chrome 103 Released on 2022-06-21
  • Chrome Android 103 Released on 2022-06-21
  • Edge 103 Released on 2022-06-23
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 17.2 Released on 2023-12-11
  • Safari on iOS 17.2 Released on 2023-12-11

• Font metric overrides

  Limited availability

  Tags: api css Groups: CSS > Fonts

  The ascent-override, descent-override, and line-gap-override descriptors adjust the display of a font declared in an @font-face statement. This can help make fallback fonts look the same size.

  Learn more

  Baseline availability blocked since June 2021 by Safari (41 months)

  • Chrome 87 Released on 2020-11-17
  • Chrome Android 87 Released on 2020-11-17
  • Edge 87 Released on 2020-11-19
  • Firefox 89 Released on 2021-06-01
  • Firefox for Android 89 Released on 2021-06-01
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• Fullscreen API

  Limited availability

  Tags: api css html

  The fullscreen API makes a specific element fill the whole screen and hides most browser UI.

  Learn more

  Baseline availability blocked since March 2023 by Safari on iOS (20 months)

  • Chrome 71 Released on 2018-12-04
  • Chrome Android 71 Released on 2018-12-04
  • Edge 79 Released on 2020-01-15
  • Firefox 64 Released on 2018-12-11
  • Firefox for Android 64 Released on 2018-12-11
  • Safari 16.4 Released on 2023-03-27
  • Safari on iOS ❌ Search for bugs Search for standards position

• Custom highlights

  Limited availability

  Tags: api css

  Custom highlights style arbitrary text ranges, without adding extra elements to the DOM.

  Learn more

  Baseline availability blocked since December 2023 by Firefox (11 months)

  • Chrome 105 Released on 2022-09-02
  • Chrome Android 105 Released on 2022-09-02
  • Edge 105 Released on 2022-09-01
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ See bugzil.la/1703961
  • Safari 17.2 Released on 2023-12-11
  • Safari on iOS 17.2 Released on 2023-12-11

• HTTP/3

  Limited availability

  HTTP/3 is a major revision of the HTTP network protocol, providing improved performance and efficiency by using QUIC as the underlying transport protocol.

  Learn more

  Baseline availability blocked since April 2021 by Safari (43 months)

  • Chrome 87 Released on 2020-11-17
  • Chrome Android 87 Released on 2020-11-17
  • Edge 87 Released on 2020-11-19
  • Firefox 88 Released on 2021-04-19
  • Firefox for Android 88 Released on 2021-04-19
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• <input type="color">

  Limited availability

  Tags: html Groups: HTML > Forms HTML > HTML elements

  The <input type="color"> HTML element displays a color picker, from which users can choose a color.

  Learn more

  Baseline availability blocked since March 2019 by Firefox for Android (68 months)

  • Chrome 20 Released on 2012-06-26
  • Chrome Android 25 Released on 2013-02-27
  • Edge 14 Released on 2016-08-02
  • Firefox 29 Released on 2014-04-29
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 12.1 Released on 2019-03-25
  • Safari on iOS 12.2 Released on 2019-03-25

• Intl.DurationFormat

  Limited availability

  Tags: javascript Groups: JavaScript > Internationalization

  The Intl.DurationFormat API creates a locale-aware formatter that turns an object representing a duration (such as days, hours, and minutes) into a string.

  Learn more

  Baseline availability blocked since September 2024 by Firefox (2 months)

  • Chrome 129 Released on 2024-09-17
  • Chrome Android 129 Released on 2024-09-17
  • Edge 129 Released on 2024-09-19
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 16.4 Released on 2023-03-27
  • Safari on iOS 16.4 Released on 2023-03-27

• Intl.Locale info

  Limited availability

  Tags: javascript Groups: JavaScript > Internationalization

  The getter methods of the Intl.Locale API provide supplemental information about a Unicode locale, such as the locale's calendar (for example, the first day in a week or the weekend start day), writing direction, 12- or 24-hour cycles, and numbering system.

  Learn more

  Baseline availability blocked since October 2024 by Firefox (1 months)

  • Chrome 130 Released on 2024-10-15
  • Chrome Android 130 Released on 2024-10-15
  • Edge 130 Released on 2024-10-17
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 17 Released on 2023-09-18
  • Safari on iOS 17 Released on 2023-09-18

• Iterator methods

  Limited availability

  Tags: javascript Groups: JavaScript > Iterators

  The Iterator object is an abstract base for objects that implement the iterator protocol. It provides methods common to built-in iterators, such as filter(), find(), map(), and reduce(). You can also use the static method Iterator.from() to convert an existing iterable into an Iterator.

  Learn more

  Baseline availability blocked since October 2024 by Safari (1 months)

  • Chrome 122 Released on 2024-02-20
  • Chrome Android 122 Released on 2024-02-20
  • Edge 122 Released on 2024-02-23
  • Firefox 131 Released on 2024-10-01
  • Firefox for Android 131 Released on 2024-10-01
  • Safari ❌ See webkit.org/b/248650
  • Safari on iOS ❌ See webkit.org/b/248650

• JavaScript modules in service workers

  Limited availability

  Tags: api javascript Groups: JavaScript modules

  The navigator.serviceWorker.register() method accepts { type: "module" } to load scripts that use import and export. Also known as ECMAScript modules or ESM in service workers.

  Learn more

  Baseline availability blocked since September 2021 by Firefox (38 months)

  • Chrome 91 Released on 2021-05-25
  • Chrome Android 91 Released on 2021-05-25
  • Edge 91 Released on 2021-05-27
  • Firefox ❌ See bugzil.la/1360870
  • Firefox for Android ❌ See bugzil.la/1360870
  • Safari 15 Released on 2021-09-20
  • Safari on iOS 15 Released on 2021-09-20

• JavaScript modules in shared workers

  Limited availability

  Tags: api Groups: JavaScript modules

  The SharedWorker() constructor accepts { type: "module" } to load scripts that use import and export. Also known as ECMAScript modules or ESM in shared workers.

  Learn more

  Baseline availability blocked since June 2023 by Chrome Android (17 months)

  • Chrome 80 Released on 2020-02-04
  • Chrome Android ❌ Search for bugs Search for Chromestatus entry
  • Edge 80 Released on 2020-02-07
  • Firefox 114 Released on 2023-06-06
  • Firefox for Android 114 Released on 2023-06-06
  • Safari 16 Released on 2022-09-12
  • Safari on iOS 16 Released on 2022-09-12

• JSON import attributes

  Limited availability

  Tags: javascript Groups: JavaScript > JSON

  Module import … with { type: "json" } statements load JSON data. Also known as JSON module scripts and formerly known as import assertions.

  Learn more

  Baseline availability blocked since March 2024 by Firefox (8 months)

  • Chrome 123 Released on 2024-03-19
  • Chrome Android 123 Released on 2024-03-19
  • Edge 123 Released on 2024-03-22
  • Firefox ❌ See bugzil.la/1736059
  • Firefox for Android ❌ See bugzil.la/1736059
  • Safari 17.2 Released on 2023-12-11
  • Safari on iOS 17.2 Released on 2023-12-11

• KHR_parallel_shader_compile WebGL extension

  Limited availability

  Tags: api Groups: WebGL > WebGL extensions

  The KHR_parallel_shader_compile extension for WebGL 1.0 and 2.0 contexts checks the status of shader compilation without blocking the runtime.

  Learn more

  Baseline availability blocked since April 2021 by Firefox (43 months)

  • Chrome 76 Released on 2019-07-30
  • Chrome Android 76 Released on 2019-07-30
  • Edge 79 Released on 2020-01-15
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 14.1 Released on 2021-04-26
  • Safari on iOS 14.5 Released on 2021-04-26

• Largest contentful paint (LCP)

  Limited availability

  Tags: api Groups: Performance

  The largest-contentful-paint performance entry and the LargestContentfulPaint API measures the time it takes for the largest image or text to appear. Largest contentful paint (LCP) is a common metric for perceived loading times.

  Learn more

  Baseline availability blocked since January 2024 by Safari (10 months)

  • Chrome 77 Released on 2019-09-10
  • Chrome Android 77 Released on 2019-09-10
  • Edge 79 Released on 2020-01-15
  • Firefox 122 Released on 2024-01-23
  • Firefox for Android 122 Released on 2024-01-23
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• ::marker

  Limited availability

  Tags: css Groups: CSS > Lists

  The ::marker CSS pseudo-element selects list item markers for styling numbers or bullets.

  Learn more

  Baseline availability blocked since October 2020 by Safari (49 months)

  • Chrome 86 Released on 2020-10-20
  • Chrome Android 86 Released on 2020-10-20
  • Edge 86 Released on 2020-10-09
  • Firefox 80 Released on 2020-08-25
  • Firefox for Android 80 Released on 2020-08-31
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• Media session

  Limited availability

  Tags: api

  The navigator.mediaSession API integrates with platform UI for media playback. It can be used to set metadata such as title and artwork, and to handle user actions like playing, pausing, or seeking.

  Learn more

  Baseline availability blocked since September 2021 by Firefox for Android (38 months)

  • Chrome 73 Released on 2019-03-12
  • Chrome Android 57 Released on 2017-03-16
  • Edge 79 Released on 2020-01-15
  • Firefox 82 Released on 2020-10-20
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 15 Released on 2021-09-20
  • Safari on iOS 15 Released on 2021-09-20

• Media source

  Limited availability

  Tags: api

  The MediaSource API is a custom data source for media elements commonly used for adaptive streaming. Also known as Media Source Extensions (MSE).

  Learn more

  Baseline availability blocked since November 2015 by Safari on iOS (108 months)

  • Chrome 31 Released on 2013-11-12
  • Chrome Android 31 Released on 2013-11-14
  • Edge 12 Released on 2015-07-29
  • Firefox 42 Released on 2015-11-03
  • Firefox for Android 42 Released on 2015-11-03
  • Safari 8 Released on 2014-10-16
  • Safari on iOS ❌ Search for bugs Search for standards position

• Notifications

  Limited availability

  The notifications API sends system notifications to the user, often even when the page or browser is not the foreground application.

  Learn more

  Baseline availability blocked since August 2016 by Safari on iOS (99 months)

  • Chrome 20 Released on 2012-06-26
  • Chrome Android 42 Released on 2015-04-15
  • Edge 14 Released on 2016-08-02
  • Firefox 22 Released on 2013-06-25
  • Firefox for Android 22 Released on 2013-06-25
  • Safari 6 Released on 2012-07-25
  • Safari on iOS ❌ Search for bugs Search for standards position

• Numeric factory functions

  Limited availability

  Tags: api Groups: CSS > CSS object models

  The numeric factory functions, such as CSS.px() or CSS.kHz(), return a CSSUnitValue representing a CSS number value (as in 12px or 440kHz).

  Learn more

  Baseline availability blocked since December 2023 by Firefox (11 months)

  • Chrome 118 Released on 2023-10-10
  • Chrome Android 118 Released on 2023-10-10
  • Edge 118 Released on 2023-10-13
  • Firefox ❌ See bugzil.la/1278697
  • Firefox for Android ❌ See bugzil.la/1278697
  • Safari 17.2 Released on 2023-12-11
  • Safari on iOS 17.2 Released on 2023-12-11

• OES_texture_half_float_linear WebGL extension

  Limited availability

  Tags: api Groups: WebGL > WebGL extensions

  The OES_texture_half_float_linear extension for WebGL 1.0 contexts adds linear filtering with half floating-point pixel types for textures.

  Learn more

  Baseline availability blocked since August 2016 by Firefox for Android (99 months)

  • Chrome 29 Released on 2013-08-20
  • Chrome Android 29 Released on 2013-08-21
  • Edge 14 Released on 2016-08-02
  • Firefox 30 Released on 2014-06-10
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 8 Released on 2014-10-16
  • Safari on iOS 8 Released on 2014-09-17

• overflow-anchor

  Limited availability

  Tags: css Groups: Scrolling

  The overflow-anchor CSS property sets an element as a possible scroll anchor, reducing unintended scrolling when document changes occur above the current scrollport. This is enabled by default where supported.

  Learn more

  Baseline availability blocked since January 2020 by Safari (58 months)

  • Chrome 56 Released on 2017-01-25
  • Chrome Android 56 Released on 2017-02-01
  • Edge 79 Released on 2020-01-15
  • Firefox 66 Released on 2019-03-19
  • Firefox for Android 66 Released on 2019-03-19
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• Page selectors

  Limited availability

  Tags: css Groups: CSS > Selectors Print media

  The :first, :left, and :right pseudo-classes select pages based on their position in sequence after pagination. They're often used with the page CSS property, to choose a print layout defined by the @page rule.

  Learn more

  Baseline availability blocked since August 2020 by Firefox (51 months)

  • Chrome 85 Released on 2020-08-25
  • Chrome Android 85 Released on 2020-08-25
  • Edge 85 Released on 2020-08-27
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari ≤13.1 Released before 2020-03-24
  • Safari on iOS ≤13.4 Released before 2020-03-24

• Page setup

  Limited availability

  Tags: css Groups: CSS > Layout Print media

  The @page CSS at-rule sets the page-specific dimensions and margins for content such as printed documents, ebooks, or slides.

  Learn more

  Baseline availability blocked since December 2021 by Safari (35 months)

  • Chrome 15 Released on 2011-10-25
  • Chrome Android 18 Released on 2012-06-27
  • Edge 79 Released on 2020-01-15
  • Firefox 95 Released on 2021-12-07
  • Firefox for Android 95 Released on 2021-12-07
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• paint-order

  Limited availability

  Tags: css svg Groups: CSS

  The paint-order CSS property sets the z-order of strokes, fills, and (in SVG content) markers. For example, paint-order: markers stroke fill; draws the markers, then stroke on top of markers, then fill on top of both markers and stroke.

  Learn more

  Baseline availability blocked since March 2024 by Safari on iOS (8 months)

  • Chrome 123 Released on 2024-03-19
  • Chrome Android 123 Released on 2024-03-19
  • Edge 123 Released on 2024-03-22
  • Firefox ≤66 Released before 2019-03-19
  • Firefox for Android 66 Released on 2019-03-19
  • Safari ≤12 Released before 2018-09-17
  • Safari on iOS ❌ Search for bugs Search for standards position

• Payment request

  Limited availability

  Tags: api html http Groups: Payments

  The PaymentRequest API prompts the user to make a payment through the browser's user interface.

  Learn more

  Baseline availability blocked since April 2018 by Firefox (79 months)

  • Chrome 60 Released on 2017-07-25
  • Chrome Android 53 Released on 2016-09-07
  • Edge 15 Released on 2017-04-05
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 11.1 Released on 2018-04-12
  • Safari on iOS 11.3 Released on 2018-03-29

• Picture-in-picture (video)

  Limited availability

  Tags: api css html http

  The picture-in-picture API allow websites to create a floating, always-on-top video window. Also known as PiP or pop-out video.

  Learn more

  Baseline availability blocked since September 2022 by Firefox (26 months)

  • Chrome 69 Released on 2018-09-04
  • Chrome Android 105 Released on 2022-09-02
  • Edge 79 Released on 2020-01-15
  • Firefox ❌ See bugzil.la/1463402
  • Firefox for Android ❌ See bugzil.la/1463402
  • Safari 13.1 Released on 2020-03-24
  • Safari on iOS 13.4 Released on 2020-03-24

• Pointer lock

  Limited availability

  Tags: api

  Provides access to raw mouse movement by locking the target of mouse events to a single element and hiding the mouse cursor.

  Learn more

  Baseline availability blocked since March 2017 by Safari on iOS (92 months)

  • Chrome 37 Released on 2014-08-26
  • Chrome Android 37 Released on 2014-09-03
  • Edge 13 Released on 2015-11-12
  • Firefox 50 Released on 2016-11-15
  • Firefox for Android 50 Released on 2016-11-15
  • Safari 10.1 Released on 2017-03-27
  • Safari on iOS ❌ Search for bugs Search for standards position

• Popover

  Limited availability

  Tags: api css html Groups: HTML

  The popover HTML attribute creates an overlay to display content on top of other page content. Popovers can be shown declaratively using HTML, or using the showPopover() method.

  Learn more

  Baseline availability blocked since April 2024 by Safari on iOS (7 months)

  • Chrome 114 Released on 2023-05-30
  • Chrome Android 114 Released on 2023-05-30
  • Edge 114 Released on 2023-06-02
  • Firefox 125 Released on 2024-04-16
  • Firefox for Android 125 Released on 2024-04-16
  • Safari 17 Released on 2023-09-18
  • Safari on iOS ❌ Search for bugs Search for standards position

• rcap unit

  Limited availability

  Tags: css Groups: CSS > Units

  The rcap CSS length unit is a font-relative length equal to the value of the cap unit on the root element. Cap-height is approximately equal to the height of a capital Latin letter.

  Learn more

  Baseline availability blocked since December 2023 by Firefox (11 months)

  • Chrome 118 Released on 2023-10-10
  • Chrome Android 118 Released on 2023-10-10
  • Edge 118 Released on 2023-10-13
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 17.2 Released on 2023-12-11
  • Safari on iOS 17.2 Released on 2023-12-11

• rch unit

  Limited availability

  Tags: css Groups: CSS > Units

  The rch CSS length unit is a font-relative length equal to the value of the ch unit on the root element. ch length is based on the width of the zero (0) character.

  Learn more

  Baseline availability blocked since December 2023 by Firefox (11 months)

  • Chrome 111 Released on 2023-03-07
  • Chrome Android 111 Released on 2023-03-07
  • Edge 111 Released on 2023-03-13
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 17.2 Released on 2023-12-11
  • Safari on iOS 17.2 Released on 2023-12-11

• Remote playback

  Limited availability

  Tags: api html

  The Remote Playback API initiates and controls playback of media on connected remote devices, such as smart TVs with AirPlay or Chromecast capabilities.

  Learn more

  Baseline availability blocked since January 2024 by Firefox (10 months)

  • Chrome 121 Released on 2024-01-23
  • Chrome Android 56 Released on 2017-02-01
  • Edge 121 Released on 2024-01-25
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 13.1 Released on 2020-03-24
  • Safari on iOS 13.4 Released on 2020-03-24

• resize (CSS property)

  Limited availability

  Tags: css Groups: CSS

  The resize CSS property sets whether an element can be resized by the user, and on which axes.

  Learn more

  Baseline availability blocked since January 2020 by Safari on iOS (58 months)

  • Chrome 4 Released on 2010-01-25
  • Chrome Android 18 Released on 2012-06-27
  • Edge 79 Released on 2020-01-15
  • Firefox 5 Released on 2011-06-21
  • Firefox for Android 5 Released on 2011-06-21
  • Safari 4 Released on 2009-06-08
  • Safari on iOS ❌ Search for bugs Search for standards position

• rex unit

  Limited availability

  Tags: css Groups: CSS > Units

  The rex CSS length unit is a font-relative length that is equal to the x-height of the root element.

  Learn more

  Baseline availability blocked since December 2023 by Firefox (11 months)

  • Chrome 111 Released on 2023-03-07
  • Chrome Android 111 Released on 2023-03-07
  • Edge 111 Released on 2023-03-13
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 17.2 Released on 2023-12-11
  • Safari on iOS 17.2 Released on 2023-12-11

• ric unit

  Limited availability

  Tags: css Groups: CSS > Units

  The ric CSS length unit, or root international character, is a font-relative length equal to the width of CJK character relative to the root element.

  Learn more

  Baseline availability blocked since December 2023 by Firefox (11 months)

  • Chrome 111 Released on 2023-03-07
  • Chrome Android 111 Released on 2023-03-07
  • Edge 111 Released on 2023-03-13
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 17.2 Released on 2023-12-11
  • Safari on iOS 17.2 Released on 2023-12-11

• ruby-align

  Limited availability

  Tags: css Groups: Ruby

  The ruby-align CSS property sets the spacing and alignment of ruby annotation text when it does not fill its available space.

  Learn more

  Baseline availability blocked since August 2024 by Safari (3 months)

  • Chrome 128 Released on 2024-08-20
  • Chrome Android 128 Released on 2024-08-20
  • Edge 128 Released on 2024-08-22
  • Firefox 38 Released on 2015-05-12
  • Firefox for Android 38 Released on 2015-05-12
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• ruby-position

  Limited availability

  Tags: css Groups: Ruby

  The ruby-position CSS property sets the position of a ruby annotation in relation to its base text. Annotations can display over, under, or interleaved with the base text.

  Learn more

  Baseline availability blocked since July 2020 by Safari (52 months)

  • Chrome 84 Released on 2020-07-27
  • Chrome Android 84 Released on 2020-07-27
  • Edge 84 Released on 2020-07-16
  • Firefox 38 Released on 2015-05-12
  • Firefox for Android 38 Released on 2015-05-12
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• @scope

  Limited availability

  Tags: api css Groups: CSS

  The @scope CSS at-rule sets the scope for a group of rules.

  Learn more

  Baseline availability blocked since March 2024 by Firefox (8 months)

  • Chrome 118 Released on 2023-10-10
  • Chrome Android 118 Released on 2023-10-10
  • Edge 118 Released on 2023-10-13
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 17.4 Released on 2024-03-05
  • Safari on iOS 17.4 Released on 2024-03-05

• Screen wake lock

  Limited availability

  Tags: api html http

  The navigator.wakeLock.request("screen") API prevents the device's screen from dimming or being turned off.

  Learn more

  Baseline availability blocked since May 2024 by Safari on iOS (6 months)

  • Chrome 84 Released on 2020-07-27
  • Chrome Android 84 Released on 2020-07-27
  • Edge 84 Released on 2020-07-16
  • Firefox 126 Released on 2024-05-14
  • Firefox for Android 126 Released on 2024-05-14
  • Safari 16.4 Released on 2023-03-27
  • Safari on iOS ❌ Search for bugs Search for standards position

• Scroll to text fragment

  Limited availability

  Groups: Text fragments Scrolling

  Text fragments are URL fragments on the form #:~:text=snippet and link to a snippet of text within a page. The browser may scroll, highlight, or otherwise bring that text to the reader's attention.

  Learn more

  Baseline availability blocked since October 2022 by Firefox (25 months)

  • Chrome 81 Released on 2020-04-07
  • Chrome Android 81 Released on 2020-04-07
  • Edge 83 Released on 2020-05-21
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 16.1 Released on 2022-10-24
  • Safari on iOS 16.1 Released on 2022-10-24

• scrollbar-color

  Limited availability

  Tags: css Groups: Scrolling

  The scrollbar-color CSS property sets the color of the scrollbar track and thumb.

  Learn more

  Baseline availability blocked since January 2024 by Safari (10 months)

  • Chrome 121 Released on 2024-01-23
  • Chrome Android 121 Released on 2024-01-23
  • Edge 121 Released on 2024-01-25
  • Firefox 64 Released on 2018-12-11
  • Firefox for Android 64 Released on 2018-12-11
  • Safari ❌ See webkit.org/b/231590
  • Safari on iOS ❌ See webkit.org/b/231590

• scrollbar-gutter

  Limited availability

  Tags: css Groups: Scrolling

  The scrollbar-gutter CSS property reserves space for the scrollbar, preventing unwanted layout changes as the scrollbar appears and disappears.

  Learn more

  Baseline availability blocked since February 2022 by Safari (33 months)

  • Chrome 94 Released on 2021-09-21
  • Chrome Android 94 Released on 2021-09-21
  • Edge 94 Released on 2021-09-24
  • Firefox 97 Released on 2022-02-08
  • Firefox for Android 97 Released on 2022-02-08
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• scrollbar-width

  Limited availability

  Tags: css Groups: Scrolling

  The scrollbar-width CSS property sets the width of the scrollbar.

  Learn more

  Baseline availability blocked since January 2024 by Safari (10 months)

  • Chrome 121 Released on 2024-01-23
  • Chrome Android 121 Released on 2024-01-23
  • Edge 121 Released on 2024-01-25
  • Firefox 64 Released on 2018-12-11
  • Firefox for Android 64 Released on 2018-12-11
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• scrollend

  Limited availability

  Tags: api Groups: Scrolling

  The scrollend event fires when an element or document has finished scrolling.

  Learn more

  Baseline availability blocked since June 2023 by Safari (17 months)

  • Chrome 114 Released on 2023-05-30
  • Chrome Android 114 Released on 2023-05-30
  • Edge 114 Released on 2023-06-02
  • Firefox 109 Released on 2023-01-17
  • Firefox for Android 109 Released on 2023-01-17
  • Safari ❌ See webkit.org/b/201556
  • Safari on iOS ❌ See webkit.org/b/201556

• ::selection

  Limited availability

  Tags: css Groups: CSS > Selectors Selection

  The ::selection CSS pseudo-element selects text a user has highlighted.

  Learn more

  Baseline availability blocked since September 2018 by Safari on iOS (74 months)

  • Chrome 1 Released on 2008-12-11
  • Chrome Android 18 Released on 2012-06-27
  • Edge 12 Released on 2015-07-29
  • Firefox 62 Released on 2018-09-05
  • Firefox for Android 62 Released on 2018-09-05
  • Safari 1.1 Released on 2003-10-24
  • Safari on iOS ❌ Search for bugs Search for standards position

• Serializable errors

  Limited availability

  Tags: api javascript

  The DOMException, Error, EvalError, RangeError, ReferenceError, SyntaxError, TypeError, and URIError objects are serializable. You can call structuredClone() on an error object or pass it to a worker using postMessage().

  Learn more

  Baseline availability blocked since July 2022 by Safari (28 months)

  • Chrome 77 Released on 2019-09-10
  • Chrome Android 77 Released on 2019-09-10
  • Edge 79 Released on 2020-01-15
  • Firefox 103 Released on 2022-07-26
  • Firefox for Android 103 Released on 2022-07-26
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• showPicker() for <input>

  Limited availability

  Tags: api Groups: HTML > Forms

  The showPicker() method for <input> elements shows the user interface for picking a value. For example, for <input type="date"> it shows the interface for picking a date.

  Learn more

  Baseline availability blocked since March 2024 by Safari on iOS (8 months)

  • Chrome 99 Released on 2022-03-01
  • Chrome Android 99 Released on 2022-03-01
  • Edge 99 Released on 2022-03-03
  • Firefox 101 Released on 2022-05-31
  • Firefox for Android 101 Released on 2022-05-31
  • Safari 17.4 Released on 2024-03-05
  • Safari on iOS ❌ See webkit.org/b/261703

• showPicker() for <select>

  Limited availability

  Tags: api Groups: HTML > Forms

  The showPicker() method for <select> elements shows the dropdown menu or other user interface for picking one of the options.

  Learn more

  Baseline availability blocked since January 2024 by Safari (10 months)

  • Chrome 121 Released on 2024-01-23
  • Chrome Android 121 Released on 2024-01-23
  • Edge 121 Released on 2024-01-25
  • Firefox 122 Released on 2024-01-23
  • Firefox for Android 122 Released on 2024-01-23
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• ::spelling-error and ::grammar-error

  Limited availability

  Tags: css Groups: CSS > Selectors

  The ::spelling-error and ::grammar-error CSS pseudo-elements match text that is highlighted as misspelled and grammatically incorrect, respectively.

  Learn more

  Baseline availability blocked since March 2024 by Firefox (8 months)

  • Chrome 121 Released on 2024-01-23
  • Chrome Android 121 Released on 2024-01-23
  • Edge 121 Released on 2024-01-25
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 17.4 Released on 2024-03-05
  • Safari on iOS 17.4 Released on 2024-03-05

• @starting-style

  Limited availability

  Tags: api css Groups: CSS

  The @starting-style CSS at-rule sets the starting values for properties that are transitioning when the target element's style is first updated.

  Learn more

  Baseline availability blocked since May 2024 by Firefox (6 months)

  • Chrome 117 Released on 2023-09-12
  • Chrome Android 117 Released on 2023-09-12
  • Edge 117 Released on 2023-09-15
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 17.5 Released on 2024-05-13
  • Safari on iOS 17.5 Released on 2024-05-13

• ::target-text

  Limited availability

  Tags: css Groups: Text fragments

  The ::target-text pseudo-element allows you to style text highlighted by a URL text fragment such as #:~:text=snippet.

  Learn more

  Baseline availability blocked since October 2024 by Safari (1 months)

  • Chrome 89 Released on 2021-03-02
  • Chrome Android 89 Released on 2021-03-02
  • Edge 89 Released on 2021-03-04
  • Firefox 131 Released on 2024-10-01
  • Firefox for Android 131 Released on 2024-10-01
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• user-select

  Limited availability

  Tags: css Groups: CSS

  The user-select CSS property controls which elements can be selected by the user.

  Learn more

  Baseline availability blocked since July 2020 by Safari (52 months)

  • Chrome 54 Released on 2016-10-12
  • Chrome Android 54 Released on 2016-10-19
  • Edge 79 Released on 2020-01-15
  • Firefox 69 Released on 2019-09-03
  • Firefox for Android 79 Released on 2020-07-28
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• Garbage collection (WebAssembly)

  Limited availability

  Tags: webassembly Groups: WebAssembly

  Garbage collection tracks references for better memory management with garbage-collected languages running in WebAssmbly.

  Learn more

  Baseline availability blocked since November 2023 by Safari (12 months)

  • Chrome 119 Released on 2023-10-31
  • Chrome Android 119 Released on 2023-10-31
  • Edge 119 Released on 2023-11-02
  • Firefox 120 Released on 2023-11-21
  • Firefox for Android 120 Released on 2023-11-21
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• Multi-memory (WebAssembly)

  Limited availability

  Tags: webassembly Groups: WebAssembly

  A single module in WebAssembly can have multiple memories.

  Learn more

  Baseline availability blocked since April 2024 by Safari (7 months)

  • Chrome 120 Released on 2023-12-05
  • Chrome Android 120 Released on 2023-12-05
  • Edge 120 Released on 2023-12-07
  • Firefox 125 Released on 2024-04-16
  • Firefox for Android 125 Released on 2024-04-16
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• Tail call optimization (WebAssembly)

  Limited availability

  Tags: webassembly Groups: WebAssembly

  Tail call optimization discards a caller frame and replaces the call with a jump instruction.

  Learn more

  Baseline availability blocked since December 2023 by Safari (11 months)

  • Chrome 112 Released on 2023-04-04
  • Chrome Android 112 Released on 2023-04-04
  • Edge 112 Released on 2023-04-06
  • Firefox 121 Released on 2023-12-19
  • Firefox for Android 121 Released on 2023-12-19
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• WebDriver BiDi

  Limited availability

  Groups: WebDriver

  WebDriver BiDi is a bidirectional protocol that allows a WebDriver client and a browser to communicate with each other.

  Learn more

  Baseline availability blocked since October 2022 by Safari (25 months)

  • Chrome 106 Released on 2022-09-27
  • Chrome Android 106 Released on 2022-09-27
  • Edge 106 Released on 2022-10-03
  • Firefox 102 Released on 2022-06-28
  • Firefox for Android 102 Released on 2022-06-28
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• WEBGL_compressed_texture_etc WebGL extension

  Limited availability

  Tags: api Groups: WebGL > WebGL extensions

  The WEBGL_compressed_texture_etc extension for WebGL 1.0 and 2.0 contexts adds many ETC2 and EAC compressed texture formats to compressedTexImage2D() and compressedTexSubImage2D().

  Learn more

  Baseline availability blocked since March 2020 by Firefox (56 months)

  • Chrome 63 Released on 2017-12-06
  • Chrome Android 63 Released on 2017-12-05
  • Edge 79 Released on 2020-01-15
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android 51 Released on 2017-01-24
  • Safari 13.1 Released on 2020-03-24
  • Safari on iOS 13.4 Released on 2020-03-24

• WEBGL_compressed_texture_etc1 WebGL extension

  Limited availability

  Tags: api Groups: WebGL > WebGL extensions

  The WEBGL_compressed_texture_etc1 extension for WebGL 1.0 and 2.0 contexts adds the ETC1 compressed texture format to compressedTexImage2D() and compressedTexSubImage2D().

  Learn more

  Baseline availability blocked since March 2020 by Firefox (56 months)

  • Chrome 49 Released on 2016-03-02
  • Chrome Android 49 Released on 2016-03-09
  • Edge 79 Released on 2020-01-15
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android 30 Released on 2014-06-10
  • Safari 13.1 Released on 2020-03-24
  • Safari on iOS 13.4 Released on 2020-03-24

• WEBGL_compressed_texture_pvrtc WebGL extension

  Limited availability

  Tags: api Groups: WebGL > WebGL extensions

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

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  Baseline availability blocked since August 2024 by Firefox (3 months)

  • Chrome 128 Released on 2024-08-20
  • Chrome Android 28 Released on 2013-07-10
  • Edge 128 Released on 2024-08-22
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 7 Released on 2013-10-22
  • Safari on iOS 7 Released on 2013-09-18

• WEBGL_compressed_texture_s3tc_srgb WebGL extension

  Limited availability

  Tags: api Groups: WebGL > WebGL extensions

  The WEBGL_compressed_texture_s3tc_srgb extension for WebGL 1.0 and 2.0 contexts adds S3TC compressed texture formats for the sRGB colorspace to compressedTexImage2D() and compressedTexSubImage2D().

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  Baseline availability blocked since April 2021 by Firefox for Android (43 months)

  • Chrome 60 Released on 2017-07-25
  • Chrome Android 60 Released on 2017-08-01
  • Edge 80 Released on 2020-02-07
  • Firefox 55 Released on 2017-08-08
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 14.1 Released on 2021-04-26
  • Safari on iOS 14.5 Released on 2021-04-26

• WEBGL_multi_draw WebGL extension

  Limited availability

  Tags: api Groups: WebGL > WebGL extensions

  The WEBGL_multi_draw extension for WebGL 1.0 and 2.0 contexts renders more than one primitive with a single function call.

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  Baseline availability blocked since September 2021 by Firefox (38 months)

  • Chrome 86 Released on 2020-10-20
  • Chrome Android 86 Released on 2020-10-20
  • Edge 86 Released on 2020-10-09
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 15 Released on 2021-09-20
  • Safari on iOS 15 Released on 2021-09-20

• SharedArrayBuffer in WebGL

  Limited availability

  Tags: api Groups: WebGL

  SharedArrayBuffer objects can be used in WebGL APIs that previously only worked with ArrayBuffer objects.

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  Baseline availability blocked since July 2020 by Safari (52 months)

  • Chrome 60 Released on 2017-07-25
  • Chrome Android 60 Released on 2017-08-01
  • Edge 79 Released on 2020-01-15
  • Firefox 79 Released on 2020-07-28
  • Firefox for Android 79 Released on 2020-07-28
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• WebTransport

  Limited availability

  Tags: api

  The WebTransport API transmits data between a client and a server, by using the HTTP/3 protocol.

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  Baseline availability blocked since June 2023 by Safari (17 months)

  • Chrome 97 Released on 2022-01-04
  • Chrome Android 97 Released on 2022-01-04
  • Edge 97 Released on 2022-01-06
  • Firefox 114 Released on 2023-06-06
  • Firefox for Android 114 Released on 2023-06-06
  • Safari ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• Widows and orphans

  Limited availability

  Tags: css Groups: CSS > Layout

  The widows and orphans CSS properties set the minimum lines included in a text fragment created by page, column, or region breaks.

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  Baseline availability blocked since July 2015 by Firefox (112 months)

  • Chrome 25 Released on 2013-02-21
  • Chrome Android 25 Released on 2013-02-27
  • Edge 12 Released on 2015-07-29
  • Firefox ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ Search for bugs Search for standards position
  • Safari 1.3 Released on 2005-04-15
  • Safari on iOS 1 Released on 2007-06-29

• writingsuggestions

  Limited availability

  Tags: api html Groups: HTML > Forms

  The writingsuggestions HTML attribute turns on or off a browser's writing suggestions. Writing suggestions vary by browser. For example, if turned on then a browser might show inline text completions accepted by pressing Tab.

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  Baseline availability blocked since September 2024 by Firefox (2 months)

  • Chrome 124 Released on 2024-04-16
  • Chrome Android 124 Released on 2024-04-16
  • Edge 124 Released on 2024-04-18
  • Firefox ❌ See bugzil.la/1871621
  • Firefox for Android ❌ See bugzil.la/1871621
  • Safari 18 Released on 2024-09-16
  • Safari on iOS 18 Released on 2024-09-16