Features missing in just one engine

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

• backdrop-filter

  Limited availability

  The backdrop-filter CSS property applies graphical effects such as blurring or color shifting to the area behind an element.

  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 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

• 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.

  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 ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• 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.

  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 ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• COLRv1

  Limited availability

  COLRv1 is a font format that supports multi-color glyphs.

  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 ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• content-visibility

  Limited availability

  The content-visibility CSS property delays rendering an element, including layout and painting, until it is needed.

  Learn more

  • Chrome 108 Released on 2022-11-29
  • Chrome Android 108 Released on 2022-11-29
  • Edge 108 Released on 2022-12-05
  • 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

• 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.

  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 ❌ See webkit.org/b/182671
  • Safari on iOS ❌ See webkit.org/b/182671

• <datalist>

  Limited availability

  The <datalist> element defines a set of recommended values for an <input> element. Browsers may show a dropdown menu of all options, or matching options as the user types.

  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 ❌ 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

• Mutually exclusive <details> elements

  Limited availability

  Multiple <details> elements which use the same name attribute are mutually exclusive. When one member of the group is opened, all other members are closed.

  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 ❌ See bugzil.la/1856460
  • Firefox for Android ❌ See bugzil.la/1856460
  • Safari 17.2 Released on 2023-12-11
  • Safari on iOS 17.2 Released on 2023-12-11

• Fetch priority

  Limited availability

  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

  • Chrome 102 Released on 2022-05-24
  • Chrome Android 102 Released on 2022-05-24
  • Edge 102 Released on 2022-05-31
  • 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

• Fullscreen API

  Limited availability

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

  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 ❌ Search for bugs Search for standards position

• Growable SharedArrayBuffer

  Limited availability

  The grow() method of a SharedArrayBuffer, constructed with the maxByteLength option, increases the size of the buffer in place.

  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 ❌ 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

• Custom highlights

  Limited availability

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

  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 ❌ 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

  • 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

• 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.

  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 ❌ 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

  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

  • 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 15 Released on 2021-09-20
  • Safari on iOS 15 Released on 2021-09-20

• JSON import attributes

  Limited availability

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

  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 ❌ 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

• 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.

  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 ❌ 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

  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

  • 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

  • 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

• Unsanitized HTML parsing methods

  Limited availability

  The Document.parseHTMLUnsafe() static method parses HTML into a DOM tree, while the setHTMLUnsafe() method of Element and ShadowRoot parses and inserts HTML into an existing tree. No sanitization applies to these methods, so never call them with user-provided HTML strings.

  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 ❌ 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

• 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.

  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 ❌ 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

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

  Learn more

  • 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

• Registered custom properties

  Limited availability

  The CSS.registerProperty() static method and the @property CSS at-rule register custom properties for which types and behaviors can be defined.

  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 ❌ 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

• Relative colors

  Limited availability

  The from keyword for color functions (color(), hsl(), oklch(), etc.) creates a new color based on a given color by modifying the values of the input color. Also known as relative color syntax (RCS).

  Learn more

  • Chrome 119 Released on 2023-10-31
  • Chrome Android 119 Released on 2023-10-31
  • Edge 119 Released on 2023-11-02
  • 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

• requestVideoFrameCallback()

  Limited availability

  The requestVideoFrameCallback() method for <video> schedules a function that runs with the next video frame. It is similar to requestAnimationFrame(), but for video.

  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 ❌ See bugzil.la/1800882
  • Firefox for Android ❌ See bugzil.la/1800882
  • Safari 15.4 Released on 2022-03-14
  • Safari on iOS 15.4 Released on 2022-03-14

• Resizable ArrayBuffer

  Limited availability

  The resize() method of an ArrayBuffer, constructed with the maxByteLength option, changes the size of the buffer in place.

  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 ❌ 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

• @scope

  Limited availability

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

  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 ❌ 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

• Scroll to text fragment

  Limited availability

  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

  • 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

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

  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 ❌ See webkit.org/b/231590
  • Safari on iOS ❌ See webkit.org/b/231590

• scrollbar-gutter

  Limited availability

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

  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 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

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

  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 ❌ See webkit.org/b/231588
  • Safari on iOS ❌ See webkit.org/b/231588

• scrollend

  Limited availability

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

  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 ❌ See webkit.org/b/201556
  • Safari on iOS ❌ See webkit.org/b/201556

• 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.

  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 ❌ See webkit.org/b/261703

• 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.

  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 ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• ::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.

  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 ❌ 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

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

  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 ❌ 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

• transition-behavior

  Limited availability

  The transition-behavior: allow-discrete CSS declaration allows transitions for properties whose animation behavior is discrete. Such properties can't be interpolated and swap from their start value to the end value at 50%.

  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 ❌ Search for bugs Search for standards position
  • Firefox for Android ❌ See bugzil.la/1805727
  • Safari 17.4 Released on 2024-03-05
  • Safari on iOS 17.4 Released on 2024-03-05

• WebDriver BiDi

  Limited availability

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

  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 ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position

• WebTransport

  Limited availability

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

  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 ❌ Search for bugs Search for standards position
  • Safari on iOS ❌ Search for bugs Search for standards position