• Filters:
• Newly available
• Widely available
• Limited availability
• One missing engine
• Discouraged
• All features

• Features only in:
• Chromium
• Firefox
• Safari

• Browser releases:
• Chrome
• Chrome Android
• Edge 141
• Firefox 144
• Firefox for Android 144
• Safari 26
• Safari on iOS 26

Features missing in just one browser engine (oldest first)

The following features are missing from just one browser engine.
This view shows the features that have been blocked for the longest time first. To see the most recently updated features first, see Features missing in just one browser engine.

• Widows and orphans

  Limited availability

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

  Baseline availability blocked since July 2015 by Firefox (123 months)

  Learn more

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

• Wheel events

  Limited availability

  The wheel event fires when the user moves a mouse wheel or similar spatially rotating input device.

  Baseline availability blocked since July 2015 by Safari on iOS (123 months)

  Learn more

  • Chrome 31 Released on 2013-11-12
  • Chrome Android 31 Released on 2013-11-14
  • Edge 12 Released on 2015-07-29
  • Firefox 17 Released on 2012-11-20
  • Firefox for Android 17 Released on 2012-11-20
  • Safari 7 Released on 2013-10-22
  • Safari on iOS ❌

• <link rel="prefetch">

  Limited availability

  The rel="prefetch" attribute for the <link> HTML element is a hint to the browser that the user is likely to navigate to a resource, so the browser should preemptively fetch and cache the resource.

  Baseline availability blocked since July 2015 by Safari (123 months)

  Learn more

  • Chrome 8 Released on 2010-12-02
  • Chrome Android 18 Released on 2012-06-27
  • Edge 12 Released on 2015-07-29
  • Firefox 2 Released on 2006-10-24
  • Firefox for Android 4 Released on 2011-03-29
  • Safari ❌
  • Safari on iOS ❌

• window.external

  Discouraged

  The window.external.AddSearchProvider() and window.external.IsSearchProviderInstalled() do nothing. Historically, they added external search providers to the browser.

  Baseline availability blocked since July 2015 by Safari (123 months)

  Learn more

  • Chrome 9 Released on 2011-02-03
  • Chrome Android 18 Released on 2012-06-27
  • Edge 12 Released on 2015-07-29
  • Firefox 2 Released on 2006-10-24
  • Firefox for Android 4 Released on 2011-03-29
  • Safari ❌
  • Safari on iOS ❌

• devicePixelRatio

  Limited availability

  The window.devicePixelRatio property is the ratio of the size of one CSS pixel to the vertical size of one physical pixel on the current display device.

  Baseline availability blocked since July 2015 by Safari (123 months)

  Learn more

  • Chrome 1 Released on 2008-12-11
  • Chrome Android 18 Released on 2012-06-27
  • Edge 12 Released on 2015-07-29
  • Firefox 18 Released on 2013-01-08
  • Firefox for Android 18 Released on 2013-01-08
  • Safari ❌
  • Safari on iOS ❌

• beforeunload

  Limited availability

  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.

  Baseline availability blocked since July 2015 by Safari on iOS (123 months)

  Learn more

  • Chrome 1 Released on 2008-12-11
  • Chrome Android 18 Released on 2012-06-27
  • Edge 12 Released on 2015-07-29
  • Firefox 1 Released on 2004-11-09
  • Firefox for Android 4 Released on 2011-03-29
  • Safari 3 Released on 2007-10-26
  • Safari on iOS ❌

• Media source

  Limited availability

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

  Baseline availability blocked since November 2015 by Safari on iOS (119 months)

  Learn more

  • 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 41 Released on 2015-09-22
  • Safari 8 Released on 2014-10-16
  • Safari on iOS ❌

• OES_texture_half_float_linear WebGL extension

  Limited availability

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

  Baseline availability blocked since August 2016 by Firefox for Android (110 months)

  Learn more

  • 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 ❌
  • Safari 8 Released on 2014-10-16
  • Safari on iOS 8 Released on 2014-09-17

• Touch events

  Limited availability

  Touch events touchstart, touchmove, touchend, and touchcancel fire when users interact with a touch-sensitive surface, such as a screen or drawing tablet. These events are similar to mouse events.

  Baseline availability blocked since March 2017 by Safari (103 months)

  Learn more

  • Chrome 22 Released on 2012-09-25
  • Chrome Android 25 Released on 2013-02-27
  • Edge 12 Released on 2015-07-29
  • Firefox 52 Released on 2017-03-07
  • Firefox for Android 6 Released on 2011-08-16
  • Safari ❌
  • Safari on iOS ≤3 Released before 2009-06-17

• ping

  Limited availability

  The ping attribute for <a> elements sets a URL to send a POST request to when the <a> is clicked. This is typically used for outbound link reporting.

  Baseline availability blocked since April 2018 by Firefox (90 months)

  Learn more

  • Chrome 12 Released on 2011-06-07
  • Chrome Android 18 Released on 2012-06-27
  • Edge 17 Released on 2018-04-30
  • Firefox ❌
  • Firefox for Android ❌
  • Safari 6 Released on 2012-07-25
  • Safari on iOS 6 Released on 2012-09-10

• Payment request

  Limited availability

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

  Baseline availability blocked since April 2018 by Firefox (90 months)

  Learn more

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

• ::selection

  Limited availability

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

  Baseline availability blocked since September 2018 by Safari on iOS (85 months)

  Learn more

  • 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 ❌

• <input type="color">

  Limited availability

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

  Baseline availability blocked since March 2019 by Firefox for Android (79 months)

  Learn more

  • 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 ❌
  • Safari 12.1 Released on 2019-03-25
  • Safari on iOS 12.2 Released on 2019-03-25

• Gamepad touch buttons

  Limited availability

  The touched property of a GamepadButton object indicates whether a button capable of detecting touch is currently touched.

  Baseline availability blocked since March 2019 by Safari (79 months)

  Learn more

  • Chrome 73 Released on 2019-03-12
  • Chrome Android 73 Released on 2019-03-12
  • Edge 15 Released on 2017-04-05
  • Firefox 55 Released on 2017-08-08
  • Firefox for Android 55 Released on 2017-08-08
  • Safari ❌
  • Safari on iOS ❌

• Time-relative pseudo-selectors

  Limited availability

  The :past and :future CSS pseudo-classes match prior or upcoming text track cues during media playback.

  Baseline availability blocked since January 2020 by Firefox (69 months)

  Learn more

  • Chrome 23 Released on 2012-11-06
  • Chrome Android 25 Released on 2013-02-27
  • Edge 79 Released on 2020-01-15
  • Firefox ❌
  • Firefox for Android ❌
  • Safari 7 Released on 2013-10-22
  • Safari on iOS 7 Released on 2013-09-18

• requestIdleCallback()

  Limited availability

  The requestIdleCallback() API queues a function that runs in idle browser time, either at the end of a frame or when the user is inactive. Also known as the background tasks API.

  Baseline availability blocked since January 2020 by Safari (69 months)

  Learn more

  • Chrome 47 Released on 2015-12-01
  • Chrome Android 47 Released on 2015-12-02
  • Edge 79 Released on 2020-01-15
  • Firefox 55 Released on 2017-08-08
  • Firefox for Android 55 Released on 2017-08-08
  • Safari ❌
  • Safari on iOS ❌

• overflow-anchor

  Limited availability

  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.

  Baseline availability blocked since January 2020 by Safari (69 months)

  Learn more

  • 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 ❌
  • Safari on iOS ❌

• Customized built-in elements

  Limited availability

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

  Baseline availability blocked since January 2020 by Safari (69 months)

  Learn more

  • 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 ❌ Vendor position : oppose
  • Safari on iOS ❌ Vendor position : oppose

• 2D canvas opacity

  Limited availability

  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.

  Baseline availability blocked since January 2020 by Safari (69 months)

  Learn more

  • Chrome 32 Released on 2014-01-14
  • Chrome Android 32 Released on 2014-01-15
  • Edge 79 Released on 2020-01-15
  • Firefox 30 Released on 2014-06-10
  • Firefox for Android 30 Released on 2014-06-10
  • Safari ❌
  • Safari on iOS ❌

• baseline-shift

  Limited availability

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

  Baseline availability blocked since January 2020 by Firefox (69 months)

  Learn more

  • Chrome 1 Released on 2008-12-11
  • Chrome Android 18 Released on 2012-06-27
  • Edge 79 Released on 2020-01-15
  • Firefox ❌
  • Firefox for Android ❌
  • Safari 4 Released on 2009-06-08
  • Safari on iOS 3.2 Released on 2010-04-03

• alignment-baseline

  Limited availability

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

  Baseline availability blocked since January 2020 by Firefox (69 months)

  Learn more

  • Chrome 1 Released on 2008-12-11
  • Chrome Android 18 Released on 2012-06-27
  • Edge 79 Released on 2020-01-15
  • Firefox ❌
  • Firefox for Android ❌
  • Safari 5.1 Released on 2011-07-20
  • Safari on iOS 5 Released on 2011-10-12

• WEBGL_compressed_texture_etc1 WebGL extension

  Limited availability

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

  Baseline availability blocked since March 2020 by Firefox (67 months)

  Learn more

  • Chrome 49 Released on 2016-03-02
  • Chrome Android 49 Released on 2016-03-09
  • Edge 79 Released on 2020-01-15
  • Firefox ❌
  • 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_etc WebGL extension

  Limited availability

  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().

  Baseline availability blocked since March 2020 by Firefox (67 months)

  Learn more

  • Chrome 63 Released on 2017-12-06
  • Chrome Android 63 Released on 2017-12-05
  • Edge 79 Released on 2020-01-15
  • Firefox ❌
  • 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

• SharedArrayBuffer in WebGL

  Limited availability

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

  Baseline availability blocked since July 2020 by Safari (63 months)

  Learn more

  • 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 ❌
  • Safari on iOS ❌

• user-select

  Limited availability

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

  Baseline availability blocked since July 2020 by Safari (63 months)

  Learn more

  • 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 ❌
  • Safari on iOS ❌

• Page selectors

  Limited availability

  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.

  Baseline availability blocked since August 2020 by Firefox (62 months)

  Learn more

  • Chrome 85 Released on 2020-08-25
  • Chrome Android 85 Released on 2020-08-25
  • Edge 85 Released on 2020-08-27
  • Firefox ❌
  • Firefox for Android ❌
  • Safari 6 Released on 2012-07-25
  • Safari on iOS 6 Released on 2012-09-10

• ::marker

  Limited availability

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

  Baseline availability blocked since October 2020 by Safari (60 months)

  Learn more

  • 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 ❌
  • Safari on iOS ❌

• WEBGL_compressed_texture_s3tc_srgb WebGL extension

  Limited availability

  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().

  Baseline availability blocked since April 2021 by Firefox for Android (54 months)

  Learn more

  • 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 ❌
  • Safari 14.1 Released on 2021-04-26
  • Safari on iOS 14.5 Released on 2021-04-26

• KHR_parallel_shader_compile WebGL extension

  Limited availability

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

  Baseline availability blocked since April 2021 by Firefox (54 months)

  Learn more

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

• EXT_float_blend WebGL extension

  Limited availability

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

  Baseline availability blocked since April 2021 by Safari on iOS (54 months)

  Learn more

  • 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 ❌

• Top-level await

  Limited availability

  The await keyword, when used at the top level of a module (outside of an async function), delays parent module execution until after a promise fulfills.

  Baseline availability blocked since June 2021 by Safari (52 months)

  Learn more

  • Chrome 89 Released on 2021-03-02
  • Chrome Android 89 Released on 2021-03-02
  • Edge 89 Released on 2021-03-04
  • Firefox 89 Released on 2021-06-01
  • Firefox for Android 89 Released on 2021-06-01
  • Safari ❌
  • Safari on iOS ❌

• Font metric overrides

  Limited availability

  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.

  Baseline availability blocked since June 2021 by Safari (52 months)

  Learn more

  • 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 ❌
  • Safari on iOS ❌

• Event timing

  Limited availability

  The event and first-input performance entries and the PerformanceEventTiming API measures the latency of user input events, such as mouse clicks or keypresses. They're used to calculate Interaction to Next Paint (INP), a common metric for perceived responsiveness.

  Baseline availability blocked since June 2021 by Safari (52 months)

  Learn more

  • 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 ❌ Vendor position : unknown (concerns: duplication, interoperability)
  • Safari on iOS ❌ Vendor position : unknown (concerns: duplication, interoperability)

• Fetch metadata request headers

  Limited availability

  The Sec-Fetch-Dest, Sec-Fetch-Mode, Sec-Fetch-Site, and Sec-Fetch-User HTTP headers provide extra information about the way a request was made, to help servers reject certain kinds of malicious requests.

  Baseline availability blocked since July 2021 by Safari (51 months)

  Learn more

  • Chrome 80 Released on 2020-02-04
  • Chrome Android 80 Released on 2020-02-04
  • Edge 80 Released on 2020-02-07
  • Firefox 90 Released on 2021-07-13
  • Firefox for Android 90 Released on 2021-07-13
  • Safari ❌
  • Safari on iOS ❌

• WEBGL_multi_draw WebGL extension

  Limited availability

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

  Baseline availability blocked since September 2021 by Firefox (49 months)

  Learn more

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

• Media session

  Limited availability

  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.

  Baseline availability blocked since September 2021 by Firefox for Android (49 months)

  Learn more

  • 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 ❌ Vendor position : positive
  • Safari 15 Released on 2021-09-20
  • Safari on iOS 15 Released on 2021-09-20

• JavaScript modules in service workers

  Limited availability

  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.

  Baseline availability blocked since September 2021 by Firefox (49 months)

  Learn more

  • Chrome 91 Released on 2021-05-25
  • Chrome Android 91 Released on 2021-05-25
  • Edge 91 Released on 2021-05-27
  • Firefox ❌
  • Firefox for Android ❌
  • Safari 15 Released on 2021-09-20
  • Safari on iOS 15 Released on 2021-09-20

• EXT_shader_texture_lod WebGL extension

  Limited availability

  The EXT_shader_texture_lod extension for WebGL 1.0 and 2.0 contexts adds texture functions to the OpenGL ES Shading Language such that the shader writer explicitly controls of the level of detail (LOD).

  Baseline availability blocked since September 2021 by Firefox for Android (49 months)

  Learn more

  • Chrome 38 Released on 2014-10-07
  • Chrome Android 38 Released on 2014-10-08
  • Edge 93 Released on 2021-09-02
  • Firefox 47 Released on 2016-06-07
  • Firefox for Android ❌
  • Safari 8 Released on 2014-10-16
  • Safari on iOS 8 Released on 2014-09-17

• EXT_frag_depth WebGL extension

  Limited availability

  The EXT_frag_depth extension for WebGL 1.0 and 2.0 contexts adds setting the depth value of a fragment from within the fragment shader.

  Baseline availability blocked since September 2021 by Firefox for Android (49 months)

  Learn more

  • Chrome 38 Released on 2014-10-07
  • Chrome Android 38 Released on 2014-10-08
  • Edge 93 Released on 2021-09-02
  • Firefox 47 Released on 2016-06-07
  • Firefox for Android ❌
  • Safari 9 Released on 2015-09-30
  • Safari on iOS 15 Released on 2021-09-20

• Desynchronized 2D canvas

  Limited availability

  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.

  Baseline availability blocked since September 2021 by Firefox (49 months)

  Learn more

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

• Cursor styles

  Limited availability

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

  Baseline availability blocked since December 2021 by Safari on iOS (46 months)

  Learn more

  • Chrome 68 Released on 2018-07-24
  • Chrome Android 68 Released on 2018-07-24
  • Edge 79 Released on 2020-01-15
  • Firefox 27 Released on 2014-02-04
  • Firefox for Android 95 Released on 2021-12-07
  • Safari 11 Released on 2017-09-19
  • Safari on iOS ❌

• Color management for 2D canvas

  Limited availability

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

  Baseline availability blocked since December 2021 by Firefox (46 months)

  Learn more

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

• Readable byte streams

  Limited availability

  A ReadableStream constructed with { type: "bytes" } reads bytes from a stream without making extra copies, improving efficiency for streams of large chunks. Also known as BYOB or bring your own buffer.

  Baseline availability blocked since June 2022 by Safari (40 months)

  Learn more

  • Chrome 89 Released on 2021-03-02
  • Chrome Android 89 Released on 2021-03-02
  • Edge 89 Released on 2021-03-04
  • Firefox 102 Released on 2022-06-28
  • Firefox for Android 102 Released on 2022-06-28
  • Safari ❌
  • Safari on iOS ❌

• Transferable streams

  Limited availability

  Streams are transferable objects, which can be moved between contexts such as windows and workers.

  Baseline availability blocked since July 2022 by Safari (39 months)

  Learn more

  • Chrome 87 Released on 2020-11-17
  • Chrome Android 87 Released on 2020-11-17
  • Edge 87 Released on 2020-11-19
  • Firefox 103 Released on 2022-07-26
  • Firefox for Android 103 Released on 2022-07-26
  • Safari ❌
  • Safari on iOS ❌

• Serializable errors

  Limited availability

  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().

  Baseline availability blocked since July 2022 by Safari (39 months)

  Learn more

  • 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 ❌
  • Safari on iOS ❌

• Shared worker

  Limited availability

  The SharedWorker() constructor runs a script in its own thread, which can send and receive messages with other scripts running at the same origin.

  Baseline availability blocked since September 2022 by Chrome Android (37 months)

  Learn more

  • Chrome 5 Released on 2010-05-25
  • Chrome Android ❌
  • Edge 79 Released on 2020-01-15
  • Firefox 29 Released on 2014-04-29
  • Firefox for Android 33 Released on 2014-10-14
  • Safari 16 Released on 2022-09-12
  • Safari on iOS 16 Released on 2022-09-12

• Picture-in-picture (video)

  Limited availability

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

  Baseline availability blocked since September 2022 by Firefox (37 months)

  Learn more

  • Chrome 69 Released on 2018-09-04
  • Chrome Android 105 Released on 2022-09-02
  • Edge 79 Released on 2020-01-15
  • Firefox ❌ Vendor position : unknown
  • Firefox for Android ❌ Vendor position : unknown
  • Safari 13.1 Released on 2020-03-24
  • Safari on iOS 13.4 Released on 2020-03-24

• Fetch upload streams

  Limited availability

  A fetch() request uploads a stream of data to the server when a request's body property is a ReadableStream object.

  Baseline availability blocked since September 2022 by Firefox (37 months)

  Learn more

  • Chrome 105 Released on 2022-09-02
  • Chrome Android 105 Released on 2022-09-02
  • Edge 105 Released on 2022-09-01
  • Firefox ❌
  • Firefox for Android ❌
  • Safari 11.1 Released on 2018-04-12
  • Safari on iOS 11.3 Released on 2018-03-29

• EXT_texture_norm16 WebGL extension

  Limited availability

  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.

  Baseline availability blocked since September 2022 by Firefox (37 months)

  Learn more

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

• WebDriver BiDi

  Limited availability

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

  Baseline availability blocked since October 2022 by Safari (36 months)

  Learn more

  • 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 ❌ Vendor position : support
  • Safari on iOS ❌ Vendor position : support

• COLRv1

  Limited availability

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

  Baseline availability blocked since November 2022 by Safari (35 months)

  Learn more

  • 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 ❌ Vendor position : unknown
  • Safari on iOS ❌ Vendor position : unknown

• <datalist>

  Limited availability

  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.

  Baseline availability blocked since February 2023 by Firefox for Android (32 months)

  Learn more

  • 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 ❌
  • Safari 12.1 Released on 2019-03-25
  • Safari on iOS 12.2 Released on 2019-03-25

• Reporting API

  Limited availability

  The Reporting-Endpoints HTTP header and ReportingObserver() API send reports of Content Security Policy (CSP) violations, Permissions-Policy violations, deprecated feature usage, browser interventions, and crashes to a nominated URL or callback function.

  Baseline availability blocked since March 2023 by Firefox (31 months)

  Learn more

  • Chrome 96 Released on 2021-11-15
  • Chrome Android 96 Released on 2021-11-15
  • Edge 96 Released on 2021-11-19
  • Firefox ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari 16.4 Released on 2023-03-27
  • Safari on iOS 16.4 Released on 2023-03-27

• Numeric factory functions

  Limited availability

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

  Baseline availability blocked since March 2023 by Firefox (31 months)

  Learn more

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

• Fullscreen API

  Limited availability

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

  Baseline availability blocked since March 2023 by Safari on iOS (31 months)

  Learn more

  • 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 ❌

• CSS typed object model

  Limited availability

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

  Baseline availability blocked since March 2023 by Firefox (31 months)

  Learn more

  • Chrome 66 Released on 2018-04-17
  • Chrome Android 66 Released on 2018-04-17
  • Edge 79 Released on 2020-01-15
  • Firefox ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari 16.4 Released on 2023-03-27
  • Safari on iOS 16.4 Released on 2023-03-27

• autocapitalize

  Limited availability

  The autocapitalize global HTML attribute sets the virtual keyboard capitalization behavior for user input on an element, such as the first letter of sentences or all words.

  Baseline availability blocked since March 2023 by Safari (31 months)

  Learn more

  • Chrome 66 Released on 2018-04-17
  • Chrome Android 66 Released on 2018-04-17
  • Edge 79 Released on 2020-01-15
  • Firefox 111 Released on 2023-03-14
  • Firefox for Android 111 Released on 2023-03-14
  • Safari ❌
  • Safari on iOS 10.3 Released on 2017-03-27

• Atomics.waitAsync

  Limited availability

  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().

  Baseline availability blocked since March 2023 by Firefox (31 months)

  Learn more

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

• WebTransport

  Limited availability

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

  Baseline availability blocked since June 2023 by Safari (28 months)

  Learn more

  • 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 ❌ Vendor position : support
  • Safari on iOS ❌ Vendor position : support

• scrollend

  Limited availability

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

  Baseline availability blocked since June 2023 by Safari (28 months)

  Learn more

  • 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 ❌ Vendor position : support
  • Safari on iOS ❌ Vendor position : support

• JavaScript modules in shared workers

  Limited availability

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

  Baseline availability blocked since June 2023 by Chrome Android (28 months)

  Learn more

  • Chrome 80 Released on 2020-02-04
  • Chrome Android ❌
  • 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

• baseline-source

  Limited availability

  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.

  Baseline availability blocked since July 2023 by Safari (27 months)

  Learn more

  • 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 ❌ Vendor position : unknown
  • Safari on iOS ❌ Vendor position : unknown

• Web app manifest

  Limited availability

  A web app manifest file provides metadata about the site. The browser can use the metadata to install the site as a standalone application on the user's device. The metadata usually includes the app's name, icon, description, and ways in which the app wishes to integrate with the device.

  Baseline availability blocked since September 2023 by Firefox (25 months)

  Learn more

  • Chrome 53 Released on 2016-08-31
  • Chrome Android 53 Released on 2016-09-07
  • Edge 79 Released on 2020-01-15
  • Firefox ❌
  • Firefox for Android 79 Released on 2020-07-28
  • Safari 17 Released on 2023-09-18
  • Safari on iOS 15.4 Released on 2022-03-14

• ric unit

  Limited availability

  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.

  Baseline availability blocked since December 2023 by Firefox (22 months)

  Learn more

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

• rex unit

  Limited availability

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

  Baseline availability blocked since December 2023 by Firefox (22 months)

  Learn more

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

• rch unit

  Limited availability

  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.

  Baseline availability blocked since December 2023 by Firefox (22 months)

  Learn more

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

• rcap unit

  Limited availability

  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.

  Baseline availability blocked since December 2023 by Firefox (22 months)

  Learn more

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

• Custom highlights

  Limited availability

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

  Baseline availability blocked since December 2023 by Firefox (22 months)

  Learn more

  • Chrome 105 Released on 2022-09-02
  • Chrome Android 105 Released on 2022-09-02
  • Edge 105 Released on 2022-09-01
  • Firefox ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari 17.2 Released on 2023-12-11
  • Safari on iOS 17.2 Released on 2023-12-11

• background-clip: text

  Limited availability

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

  Baseline availability blocked since December 2023 by Firefox (22 months)

  Learn more

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

• showPicker() for <select>

  Limited availability

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

  Baseline availability blocked since January 2024 by Safari (21 months)

  Learn more

  • 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 ❌ Vendor position : support
  • Safari on iOS ❌ Vendor position : support

• scrollbar-color

  Limited availability

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

  Baseline availability blocked since January 2024 by Safari (21 months)

  Learn more

  • 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 ❌ Vendor position : support
  • Safari on iOS ❌ Vendor position : support

• Remote playback

  Limited availability

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

  Baseline availability blocked since January 2024 by Firefox (21 months)

  Learn more

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

• page-orientation

  Limited availability

  The page-orientation CSS property sets the rotation of a page after pagination. This allows pages with the same size declaration to display with different orientations.

  Baseline availability blocked since January 2024 by Safari (21 months)

  Learn more

  • Chrome 85 Released on 2020-08-25
  • Chrome Android 85 Released on 2020-08-25
  • Edge 85 Released on 2020-08-27
  • Firefox 122 Released on 2024-01-23
  • Firefox for Android 122 Released on 2024-01-23
  • Safari ❌
  • Safari on iOS ❌

• Largest contentful paint (LCP)

  Limited availability

  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.

  Baseline availability blocked since January 2024 by Safari (21 months)

  Learn more

  • 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 ❌ Vendor position : unknown
  • Safari on iOS ❌ Vendor position : unknown

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

  Limited availability

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

  Baseline availability blocked since March 2024 by Firefox (19 months)

  Learn more

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

• showPicker() for <input>

  Limited availability

  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.

  Baseline availability blocked since March 2024 by Safari on iOS (19 months)

  Learn more

  • 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 ❌

• @scope

  Limited availability

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

  Baseline availability blocked since March 2024 by Firefox (19 months)

  Learn more

  • Chrome 118 Released on 2023-10-10
  • Chrome Android 118 Released on 2023-10-10
  • Edge 118 Released on 2023-10-13
  • Firefox ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari 17.4 Released on 2024-03-05
  • Safari on iOS 17.4 Released on 2024-03-05

• paint-order

  Limited availability

  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.

  Baseline availability blocked since March 2024 by Safari on iOS (19 months)

  Learn more

  • 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 before 2019-03-19
  • Safari ≤12 Released before 2018-09-17
  • Safari on iOS ❌

• Multi-memory (WebAssembly)

  Limited availability

  A single module in WebAssembly can have multiple memories.

  Baseline availability blocked since April 2024 by Safari (18 months)

  Learn more

  • 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 ❌
  • Safari on iOS ❌

• context-fill and context-stroke

  Limited availability

  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.

  Baseline availability blocked since April 2024 by Safari (18 months)

  Learn more

  • 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 ❌
  • Safari on iOS ❌

• contextlost and contextrestored

  Limited availability

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

  Baseline availability blocked since April 2024 by Safari (18 months)

  Learn more

  • 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 ❌
  • Safari on iOS ❌

• Asynchronously iterable streams

  Limited availability

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

  Baseline availability blocked since April 2024 by Safari (18 months)

  Learn more

  • 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 ❌ Vendor position : support
  • Safari on iOS ❌ Vendor position : support

• Zstandard compression

  Limited availability

  Zstandard or zstd is fast lossless compression algorithm. When used as a content encoding, it is often faster and offers better compression than brotli.

  Baseline availability blocked since May 2024 by Safari (17 months)

  Learn more

  • Chrome 123 Released on 2024-03-19
  • Chrome Android 123 Released on 2024-03-19
  • Edge 123 Released on 2024-03-22
  • Firefox 126 Released on 2024-05-14
  • Firefox for Android 126 Released on 2024-05-14
  • Safari ❌
  • Safari on iOS ❌

• navigator.share()

  Limited availability

  The navigator.share() method invokes the device's native sharing mechanism and passes text, links, files, and other content to share targets. Also known as the Web Share API.

  Baseline availability blocked since August 2024 by Firefox (14 months)

  Learn more

  • Chrome 128 Released on 2024-08-20
  • Chrome Android 61 Released on 2017-09-05
  • Edge 93 Released on 2021-09-02
  • Firefox ❌ Vendor position : positive
  • Firefox for Android 79 Released on 2020-07-28
  • Safari 12.1 Released on 2019-03-25
  • Safari on iOS 12.2 Released on 2019-03-25

• document.caretPositionFromPoint()

  Limited availability

  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.

  Baseline availability blocked since August 2024 by Safari (14 months)

  Learn more

  • 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 ❌ Vendor position : support
  • Safari on iOS ❌ Vendor position : support

• writingsuggestions

  Limited availability

  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.

  Baseline availability blocked since September 2024 by Firefox (13 months)

  Learn more

  • Chrome 124 Released on 2024-04-16
  • Chrome Android 124 Released on 2024-04-16
  • Edge 124 Released on 2024-04-18
  • Firefox ❌
  • Firefox for Android ❌
  • Safari 18 Released on 2024-09-16
  • Safari on iOS 18 Released on 2024-09-16

• display animation

  Limited availability

  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.

  Baseline availability blocked since September 2024 by Firefox (13 months)

  Learn more

  • Chrome 117 Released on 2023-09-12
  • Chrome Android 117 Released on 2023-09-12
  • Edge 117 Released on 2023-09-15
  • Firefox ❌ Vendor position : unknown
  • Firefox for Android ❌ Vendor position : unknown
  • Safari 18 Released on 2024-09-16
  • Safari on iOS 18 Released on 2024-09-16

• Container style queries

  Limited availability

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

  Baseline availability blocked since September 2024 by Firefox (13 months)

  Learn more

  • Chrome 111 Released on 2023-03-07
  • Chrome Android 111 Released on 2023-03-07
  • Edge 111 Released on 2023-03-13
  • Firefox ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari 18 Released on 2024-09-16
  • Safari on iOS 18 Released on 2024-09-16

• Intl.Locale info

  Limited availability

  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.

  Baseline availability blocked since October 2024 by Firefox (12 months)

  Learn more

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

• box-decoration-break

  Limited availability

  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.

  Baseline availability blocked since October 2024 by Safari (12 months)

  Learn more

  • 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 ❌
  • Safari on iOS ❌

• Cross-document view transitions

  Limited availability

  The @view-transition CSS rule sets whether a document opts-in to transitions between documents in a multi-page application. Both the old and new document must opt-in for a transition to be triggered.

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

  Learn more

  • Chrome 126 Released on 2024-06-11
  • Chrome Android 126 Released on 2024-06-11
  • Edge 126 Released on 2024-06-13
  • Firefox ❌
  • Firefox for Android ❌
  • Safari 18.2 Released on 2024-12-11
  • Safari on iOS 18.2 Released on 2024-12-11

• blocking="render"

  Limited availability

  The blocking="render" attribute for <link>, <script>, and <style> elements blocks rendering until the external script or stylesheet has been loaded. For <link rel="expect">, rendering is blocked until a specific element is in the DOM.

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

  Learn more

  • Chrome 105 Released on 2022-09-02
  • Chrome Android 105 Released on 2022-09-02
  • Edge 105 Released on 2022-09-01
  • Firefox ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari 18.2 Released on 2024-12-11
  • Safari on iOS 18.2 Released on 2024-12-11

• Active view transition

  Limited availability

  The :active-view-transition CSS pseudo-class matches the root element when a view transition is active. The :active-view-transition-type() CSS pseudo-class matches only when the active view transition was started with the specified type.

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

  Learn more

  • Chrome 125 Released on 2024-05-14
  • Chrome Android 125 Released on 2024-05-14
  • Edge 125 Released on 2024-05-17
  • Firefox ❌
  • Firefox for Android ❌
  • Safari 18.2 Released on 2024-12-11
  • Safari on iOS 18.2 Released on 2024-12-11

• String builtins (WebAssembly)

  Limited availability

  The WebAssembly builtin string functions mirror a subset of the JavaScript String API and adapt it to be efficiently callable without JavaScript glue code.

  Baseline availability blocked since January 2025 by Safari (9 months)

  Learn more

  • Chrome 130 Released on 2024-10-15
  • Chrome Android 130 Released on 2024-10-15
  • Edge 130 Released on 2024-10-17
  • Firefox 134 Released on 2025-01-07
  • Firefox for Android 134 Released on 2025-01-07
  • Safari ❌
  • Safari on iOS ❌

• Memory64 (WebAssembly)

  Limited availability

  Instructions accept 64-bit memory indexes.

  Baseline availability blocked since February 2025 by Safari (8 months)

  Learn more

  • Chrome 133 Released on 2025-02-04
  • Chrome Android 133 Released on 2025-02-04
  • Edge 133 Released on 2025-02-06
  • Firefox 134 Released on 2025-01-07
  • Firefox for Android 134 Released on 2025-01-07
  • Safari ❌
  • Safari on iOS ❌

• text-box

  Limited availability

  The text-box CSS property sets the spacing above and below text based on a font's typographic features. For example, text-box: trim-both ex alphabetic trims the top to the top of the letter x and the bottom to the bottom of most letters, without descenders.

  Baseline availability blocked since February 2025 by Firefox (8 months)

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  • Chrome 133 Released on 2025-02-04
  • Chrome Android 133 Released on 2025-02-04
  • Edge 133 Released on 2025-02-06
  • Firefox ❌
  • Firefox for Android ❌
  • Safari 18.2 Released on 2024-12-11
  • Safari on iOS 18.2 Released on 2024-12-11

• JSON source text access

  Limited availability

  To serialize and parse JSON in a lossless way, JSON.stringify() handles rawJSON values and JSON.parse()'s reviver callback takes a source context parameter.

  Baseline availability blocked since February 2025 by Safari (8 months)

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  • Chrome 114 Released on 2023-05-30
  • Chrome Android 114 Released on 2023-05-30
  • Edge 114 Released on 2023-06-02
  • Firefox 135 Released on 2025-02-04
  • Firefox for Android 135 Released on 2025-02-04
  • Safari ❌
  • Safari on iOS ❌

• :open

  Limited availability

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

  Baseline availability blocked since March 2025 by Safari (7 months)

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  • Chrome 133 Released on 2025-02-04
  • Chrome Android 133 Released on 2025-02-04
  • Edge 133 Released on 2025-02-06
  • Firefox 136 Released on 2025-03-04
  • Firefox for Android 136 Released on 2025-03-04
  • Safari ❌ Vendor position : support
  • Safari on iOS ❌ Vendor position : support

• :has-slotted

  Limited availability

  The :has-slotted CSS pseudo-class matches <slot> elements where the fallback content is not shown. The pseudo-class matches any slotted content, including white space, text nodes, or elements.

  Baseline availability blocked since March 2025 by Safari (7 months)

  Learn more

  • Chrome 134 Released on 2025-03-04
  • Chrome Android 134 Released on 2025-03-04
  • Edge 134 Released on 2025-03-06
  • Firefox 136 Released on 2025-03-04
  • Firefox for Android 136 Released on 2025-03-04
  • Safari ❌ Vendor position : support
  • Safari on iOS ❌ Vendor position : support

• Error.isError()

  Limited availability

  The Error.isError() static method checks whether a value is an Error object.

  Baseline availability blocked since April 2025 by Safari (6 months)

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  • Chrome 134 Released on 2025-03-04
  • Chrome Android 134 Released on 2025-03-04
  • Edge 134 Released on 2025-03-06
  • Firefox 138 Released on 2025-04-29
  • Firefox for Android 138 Released on 2025-04-29
  • Safari ❌
  • Safari on iOS ❌

• Hyphenate limit chars

  Limited availability

  The hyphenate-limit-chars CSS property sets the number of characters in a word before it is hyphenated and the minimum number of characters on either side of the hyphen.

  Baseline availability blocked since April 2025 by Safari (6 months)

  Learn more

  • Chrome 109 Released on 2023-01-10
  • Chrome Android 109 Released on 2023-01-10
  • Edge 109 Released on 2023-01-12
  • Firefox 137 Released on 2025-04-01
  • Firefox for Android 137 Released on 2025-04-01
  • Safari ❌
  • Safari on iOS ❌

• Exception references with exnref (WebAssembly)

  Limited availability

  When caught, an exception is reified into an exception reference, a value of the new type exnref.

  Baseline availability blocked since May 2025 by Edge (5 months)

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  • Chrome 137 Released on 2025-05-27
  • Chrome Android 137 Released on 2025-05-27
  • Edge ❌
  • Firefox 131 Released on 2024-10-01
  • Firefox for Android 131 Released on 2024-10-01
  • Safari 18.4 Released on 2025-03-31
  • Safari on iOS 18.4 Released on 2025-03-31

• hidden="until-found"

  Limited availability

  The hidden="until-found" attribute hides an element until it is found using the browser's find-in-page search or it is directly navigated to by following a URL fragment.

  Baseline availability blocked since May 2025 by Safari (5 months)

  Learn more

  • Chrome 102 Released on 2022-05-24
  • Chrome Android 102 Released on 2022-05-24
  • Edge 102 Released on 2022-05-31
  • Firefox 139 Released on 2025-05-27
  • Firefox for Android 139 Released on 2025-05-27
  • Safari ❌ Vendor position : support
  • Safari on iOS ❌ Vendor position : support

• font-variant-emoji

  Limited availability

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

  Baseline availability blocked since July 2025 by Safari (3 months)

  Learn more

  • Chrome 131 Released on 2024-11-12
  • Chrome Android 131 Released on 2024-11-12
  • Edge 131 Released on 2024-11-14
  • Firefox 141 Released on 2025-07-22
  • Firefox for Android 141 Released on 2025-07-22
  • Safari ❌
  • Safari on iOS ❌

• Explicit resource management

  Limited availability

  The using and await using declarations and the dispose and asyncDispose symbols manage the lifecycle of resources such as file handles and streams. The DisposableStack and AsyncDisposableStack objects can group, dispose, and coordinate dependencies between multiple disposable resources.

  Baseline availability blocked since July 2025 by Safari (3 months)

  Learn more

  • Chrome 134 Released on 2025-03-04
  • Chrome Android 134 Released on 2025-03-04
  • Edge 134 Released on 2025-03-06
  • Firefox 141 Released on 2025-07-22
  • Firefox for Android 141 Released on 2025-07-22
  • Safari ❌
  • Safari on iOS ❌

• <dialog closedby>

  Limited availability

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

  Baseline availability blocked since July 2025 by Safari (3 months)

  Learn more

  • Chrome 134 Released on 2025-03-04
  • Chrome Android 134 Released on 2025-03-04
  • Edge 134 Released on 2025-03-06
  • Firefox 141 Released on 2025-07-22
  • Firefox for Android 141 Released on 2025-07-22
  • Safari ❌ Vendor position : support
  • Safari on iOS ❌ Vendor position : support

• Scheduler API

  Limited availability

  The scheduler API provides a way to prioritize all tasks belonging to an application.

  Baseline availability blocked since August 2025 by Safari (2 months)

  Learn more

  • Chrome 129 Released on 2024-09-17
  • Chrome Android 129 Released on 2024-09-17
  • Edge 129 Released on 2024-09-19
  • Firefox 142 Released on 2025-08-19
  • Firefox for Android 142 Released on 2025-08-19
  • Safari ❌
  • Safari on iOS ❌

• WebCodecs

  Limited availability

  The WebCodecs API provides low-level access to individual video frames and chunks of audio samples, for full control over the way media is processed.

  Baseline availability blocked since September 2025 by Firefox for Android (1 months)

  Learn more

  • Chrome 94 Released on 2021-09-21
  • Chrome Android 94 Released on 2021-09-21
  • Edge 94 Released on 2021-09-24
  • Firefox 130 Released on 2024-09-03
  • Firefox for Android ❌ Vendor position : positive
  • Safari 26 Released on 2025-09-15
  • Safari on iOS 26 Released on 2025-09-15

• Web authentication signal methods

  Limited availability

  The signalUnknownCredential(), signalAllAcceptedCredentials(), and signalCurrentUserDetails() methods of PublicKeyCredential inform authenticators of the state of public key credentials, so that incorrect or revoked credentials may be updated, removed, or hidden.

  Baseline availability blocked since September 2025 by Firefox (1 months)

  Learn more

  • Chrome 132 Released on 2025-01-14
  • Chrome Android 132 Released on 2025-01-14
  • Edge 132 Released on 2025-01-17
  • Firefox ❌
  • Firefox for Android ❌
  • Safari 26 Released on 2025-09-15
  • Safari on iOS 26 Released on 2025-09-15

• Trusted types

  Limited availability

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

  Baseline availability blocked since September 2025 by Firefox (1 months)

  Learn more

  • Chrome 83 Released on 2020-05-19
  • Chrome Android 83 Released on 2020-05-19
  • Edge 83 Released on 2020-05-21
  • Firefox ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari 26 Released on 2025-09-15
  • Safari on iOS 26 Released on 2025-09-15

• text-wrap-style

  Limited availability

  The text-wrap-style CSS property sets how lines break in text that overflows the container. It can also be set with the text-wrap shorthand.

  Baseline availability blocked since September 2025 by Firefox (1 months)

  Learn more

  • Chrome 130 Released on 2024-10-15
  • Chrome Android 130 Released on 2024-10-15
  • Edge 130 Released on 2024-10-17
  • Firefox ❌ Vendor position : positive (concerns: compatibility, complexity)
  • Firefox for Android ❌ Vendor position : positive (concerns: compatibility, complexity)
  • Safari 26 Released on 2025-09-15
  • Safari on iOS 26 Released on 2025-09-15

• text-wrap: pretty

  Limited availability

  The text-wrap: pretty CSS declaration prioritizes better layout over speed when text is broken into multiple lines.

  Baseline availability blocked since September 2025 by Firefox (1 months)

  Learn more

  • Chrome 117 Released on 2023-09-12
  • Chrome Android 117 Released on 2023-09-12
  • Edge 117 Released on 2023-09-15
  • Firefox ❌ Vendor position : positive (concerns: compatibility, complexity)
  • Firefox for Android ❌ Vendor position : positive (concerns: compatibility, complexity)
  • Safari 26 Released on 2025-09-15
  • Safari on iOS 26 Released on 2025-09-15

• Scroll-driven animations

  Limited availability

  The animation-timeline, scroll-timeline, and view-timeline CSS properties advance animations based on the user's scroll position.

  Baseline availability blocked since September 2025 by Firefox (1 months)

  Learn more

  • Chrome 115 Released on 2023-07-18
  • Chrome Android 115 Released on 2023-07-21
  • Edge 115 Released on 2023-07-21
  • Firefox ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari 26 Released on 2025-09-15
  • Safari on iOS 26 Released on 2025-09-15

• Anchor positioning

  Limited availability

  Anchor positioning places an element based on the position of another element. For example, you can place a tooltip next to the content it references.

  Baseline availability blocked since September 2025 by Firefox (1 months)

  Learn more

  • Chrome 125 Released on 2024-05-14
  • Chrome Android 125 Released on 2024-05-14
  • Edge 125 Released on 2024-05-17
  • Firefox ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari 26 Released on 2025-09-15
  • Safari on iOS 26 Released on 2025-09-15

• Invoker commands

  Limited availability

  The command and commandfor attributes for the <button> HTML element dispatch an action to an element when the button is invoked (by click or keystroke), as a declarative alternative to addEventListener() calls or onclick attribute handlers.

  Baseline availability blocked since October 2025 by Safari (0 months)

  Learn more

  • Chrome 135 Released on 2025-04-01
  • Chrome Android 135 Released on 2025-04-01
  • Edge 135 Released on 2025-04-04
  • Firefox 144 Released on 2025-10-14
  • Firefox for Android 144 Released on 2025-10-14
  • Safari ❌ Vendor position : support
  • Safari on iOS ❌ Vendor position : support