Features implemented only in Chromium

The following features are only implemented in Chromium.

• Accelerometer

  Limited availability

  The Accelerometer, LinearAccelerationSensor and GravitySensor APIs read the acceleration applied to a device in three dimensions, either including the effect of gravity, without its effect, or only its effect, respectively.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported Position: oppose
  • Safari on iOS Not supported Position: oppose

• Anchor positioning transforms

  Limited availability

  Anchor positioned elements take CSS transforms on their anchor elements into account.

  Learn more

  • Chrome 144 Released on 2026-01-13
  • Chrome Android 144 Released on 2026-01-13
  • Edge 144 Released on 2026-01-21
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• File handlers

  Limited availability

  The file_handlers web app manifest member registers an installed web app as a handler for files with specific file extensions or MIME types.

  Learn more

  • Chrome 102 Released on 2022-05-24
  • Chrome Android Not supported
  • Edge 102 Released on 2022-05-31
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Launch handler

  Limited availability

  The launch_handler web app manifest member, with the client_mode property, configure how web app launches behave when an instance of the app is already open. For example, you can choose to focus the existing app instance instead of launching a new one.

  Learn more

  • Chrome 110 Released on 2023-02-07
  • Chrome Android Not supported
  • Edge 110 Released on 2023-02-09
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Web app origin migration

  Limited availability

  The migrate_to and migrate_from web app manifest members move an installed app from one origin to another, within the same site. They preserve the user's installation settings on the device, like shortcuts.

  Learn more

  • Chrome 149 Released on 2026-06-02
  • Chrome Android Not supported
  • Edge 149 Released on 2026-06-04
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Protocol handlers

  Limited availability

  The protocol_handlers web app manifest member registers an installed web app as a handler for a specific protocol. When a user follows a link with the specified protocol, the installed app opens the link.

  Learn more

  • Chrome 96 Released on 2021-11-15
  • Chrome Android Not supported
  • Edge 96 Released on 2021-11-19
  • Firefox Not supported Position: defer
  • Firefox for Android Not supported Position: defer
  • Safari Not supported
  • Safari on iOS Not supported

• Share targets

  Limited availability

  The share_target web app manifest member registers an installed web app as a handler for shared content. When a user shares content by using the device share dialog, the installed app can be listed as an option for handling the shared content.

  Learn more

  • Chrome 89 Released on 2021-03-02
  • Chrome Android 76 Released on 2019-07-30
  • Edge 89 Released on 2021-03-04
  • Firefox Not supported Position: positive
  • Firefox for Android Not supported Position: positive
  • Safari Not supported Position: neutral
  • Safari on iOS Not supported Position: neutral

• Attribution reporting

  The attribution reporting API measures when an ad click or view leads to a conversion, such as a purchase on an advertiser site.

  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 Not supported Position
  • Firefox for Android Not supported Position
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• Background fetch

  Limited availability

  Background fetch downloads data in the background even when the web page is closed.

  Learn more

  • Chrome 74 Released on 2019-04-23
  • Chrome Android 74 Released on 2019-04-24
  • Edge 79 Released on 2020-01-15
  • Firefox Not supported Position
  • Firefox for Android Not supported Position
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• Background sync

  Limited availability

  The background synchronization API registers a service worker callback to run only when the device is no longer offline. You can use this to let users continue using your app while offline and synchronize with a server after reconnecting.

  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 Not supported Position: negative
  • Firefox for Android Not supported Position: negative
  • Safari Not supported
  • Safari on iOS Not supported

• Barcode detector

  Limited availability

  The BarcodeDetector API recognizes various barcode formats in images.

  Learn more

  • Chrome Not supported
  • Chrome Android 83 Released on 2020-05-19
  • Edge Not supported
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Battery status

  Limited availability

  The navigator.getBattery() API obtains information about the device's battery, including charge level and status. Also known as the Battery API.

  Learn more

  • Chrome 38 Released on 2014-10-07
  • Chrome Android 38 Released on 2014-10-08
  • Edge 79 Released on 2020-01-15
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• beforeinstallprompt

  Limited availability

  The beforeinstallprompt event fires when a Progressive Web App (PWA) is installable. You can cancel the event and later call event.prompt() to control when the installation prompt is shown. The appinstalled event fires when the PWA is successfully installed.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Back/forward cache blocking reasons

  Limited availability

  The notRestoredReasons property of a PerformanceNavigationTiming object explains why the current document was blocked from using the back/forward cache (also known as the bfcache) on navigation.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• border-shape

  Limited availability

  The border-shape CSS property sets the geometry of the border box, changing the shape of any applicable border, border image, focus outline, or shadow.

  Learn more

  • Chrome 147 Released on 2026-04-07
  • Chrome Android 147 Released on 2026-04-07
  • Edge 147 Released on 2026-04-10
  • Firefox Not supported Position
  • Firefox for Android Not supported Position
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• calc-size()

  Limited availability

  The calc-size() CSS function computes mathematical expressions that include height and width keyword values, for example calc-size(fit-content, size / 2). Not to be confused with the calc() CSS function, which cannot use keyword values.

  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 Not supported Position: positive
  • Firefox for Android Not supported Position: positive
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• Capture Handle

  Limited availability

  The capture handle API allows you to share a custom handle (a string) from a web application being captured by getDisplayMedia() to the capturing web application.

  Learn more

  • Chrome 102 Released on 2022-05-24
  • Chrome Android Not supported
  • Edge 102 Released on 2022-05-31
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• caret-shape

  Limited availability

  The caret-shape CSS property sets the shape of the insertion caret, the symbol that shows where the next character is to be inserted or deleted.

  Learn more

  • Chrome 144 Released on 2026-01-13
  • Chrome Android 144 Released on 2026-01-13
  • Edge 144 Released on 2026-01-21
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Custom formats for clipboard items

  Limited availability

  The web prefix for ClipboardItem data types (also known as MIME types) allows reading and writing unsanitized custom data from the device clipboard.

  Learn more

  • Chrome 104 Released on 2022-08-02
  • Chrome Android 104 Released on 2022-08-02
  • Edge 104 Released on 2022-08-05
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• SVG clipboard items

  Limited availability

  The image/svg+xml data type (also known as the MIME type) for ClipboardItem objects represents SVG data written to or read from the clipboard.

  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 Not supported Position
  • Firefox for Android Not supported Position
  • Safari Not supported
  • Safari on iOS Not supported

• Read unsanitized clipboard data

  Limited availability

  The optional formats.unsanitized parameter of the navigator.clipboard.read() method reads unsanitized text/html data from the system clipboard.

  Learn more

  • Chrome 122 Released on 2024-02-20
  • Chrome Android 122 Released on 2024-02-20
  • Edge 122 Released on 2024-02-23
  • Firefox Not supported Position: neutral
  • Firefox for Android Not supported Position: neutral
  • Safari Not supported
  • Safari on iOS Not supported

• clipboardchange

  Limited availability

  The clipboardchange event for navigator.clipboard fires when the user modifies the clipboard's contents.

  Learn more

  • Chrome 144 Released on 2026-01-13
  • Chrome Android 144 Released on 2026-01-13
  • Edge 144 Released on 2026-01-21
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Column breaks

  Limited availability

  In columnar layouts (created by the columns or column-count CSS properties), the break-after, break-before, break-inside properties control where columns start or end.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• ::column

  Limited availability

  The ::column CSS pseudo-element represents the individual columns of a multi-column layout container. Columns can only be styled with scroll snap CSS properties and can also have a ::scroll-marker pseudo-element, which scrolls to the column when activated.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Compression Dictionary Transport

  Limited availability

  Compression Dictionary Transport is a mechanism for using designated HTTP responses as an external dictionary for future HTTP responses for compression schemes that support using external dictionaries (e.g., Brotli and Zstandard)

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• CPU compute pressure

  Limited availability

  The PressureObserver API monitors CPU load, allowing you to adjust workloads in response to available computing resources. Also known as the Compute Pressure API.

  Learn more

  • Chrome 125 Released on 2024-05-14
  • Chrome Android Not supported
  • Edge 125 Released on 2024-05-17
  • Firefox Not supported Position
  • Firefox for Android Not supported Position
  • Safari Not supported Position: oppose
  • Safari on iOS Not supported Position: oppose

• Contact picker

  Limited availability

  The navigator.contacts API allows you to ask users to share limited details about entries in their contact list with your application.

  Learn more

  • Chrome Not supported
  • Chrome Android 80 Released on 2020-02-04
  • Edge Not supported
  • Firefox Not supported Position: defer
  • Firefox for Android Not supported Position: defer
  • Safari Not supported
  • Safari on iOS Not supported

• Anchor position container queries

  Limited availability

  Anchor position container queries with the @container anchored(fallback: …) at-rule apply styles to an element based on the element's anchor position.

  Learn more

  • Chrome 143 Released on 2025-12-02
  • Chrome Android 143 Released on 2025-12-02
  • Edge 143 Released on 2025-12-05
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Container scroll-state queries

  Limited availability

  Container scroll-state queries with the @container scroll-state(...) at-rule apply styles to an element based on the sticky positioning, snapped, and scrollable state of the container.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Content Index

  Limited availability

  The Content Index API allows developers to register their offline enabled content with the browser.

  Learn more

  • Chrome Not supported
  • Chrome Android 84 Released on 2020-07-27
  • Edge Not supported
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• controlslist

  Limited availability

  The controlslist attribute for <audio> or <video> hides parts of the browser's built-in controls. For example, controlslist="nofullscreen" removes the button to play the video in fullscreen.

  Learn more

  • Chrome 58 Released on 2017-04-19
  • Chrome Android 58 Released on 2017-04-25
  • Edge 79 Released on 2020-01-15
  • Firefox Not supported Position
  • Firefox for Android Not supported Position
  • Safari Not supported
  • Safari on iOS Not supported

• Cookie store

  Limited availability

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

  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 Not supported Position: positive
  • Firefox for Android Not supported Position: positive
  • Safari Not supported Position: support
  • Safari on iOS Not supported Position: support

• corner-shape

  Limited availability

  The corner-shape CSS property sets the shape of an element's corners when using border-radius, allowing for shapes other than rounded corners. For example, corner-shape: squircle is a shape in between a square and rounded corner.

  Learn more

  • Chrome 139 Released on 2025-08-05
  • Chrome Android 139 Released on 2025-08-05
  • Edge 139 Released on 2025-08-07
  • Firefox Not supported Position
  • Firefox for Android Not supported Position
  • Safari Not supported Position: support
  • Safari on iOS Not supported Position: support

• Customizable <select>

  Limited availability

  The <select> element's appearance, including the button, selected option, picker dropdown, and options, can be customized using CSS.

  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 Not supported Position: positive
  • Firefox for Android Not supported Position: positive
  • Safari Not supported Position: support
  • Safari on iOS Not supported Position: support

• Device memory

  Limited availability

  The navigator.deviceMemory property is the approximate amount of device memory, in gigabytes.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Device posture

  Limited availability

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

  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 Not supported Position
  • Firefox for Android Not supported Position
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• Digital goods

  Limited availability

  The window.getDigitalGoodsService API connects to stores or billing services for in-app products and subscriptions.

  Learn more

  • Chrome Not supported
  • Chrome Android 101 Released on 2022-04-26
  • Edge 134 Released on 2025-03-06
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• dynamic-range-limit

  Limited availability

  The dynamic-range-limit CSS property controls the peak luminance of high dynamic range content. You can use this to coordinate the apparent brightness of HDR and SDR content.

  Learn more

  • Chrome 136 Released on 2025-04-29
  • Chrome Android 136 Released on 2025-04-29
  • Edge 136 Released on 2025-05-01
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• EditContext

  Limited availability

  The EditContext API allows you to build rich text editors that support advanced text input, such as Input Method Editor (IME) composition, an emoji picker, or other platform-specific editing UI.

  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 Not supported Position: positive
  • Firefox for Android Not supported Position: positive
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• Element capture

  Limited availability

  The restrictTo() method on screen capture media tracks limits capture to a specific element, excluding content which might occlude the element itself, such as video conferencing controls.

  Learn more

  • Chrome 132 Released on 2025-01-14
  • Chrome Android Not supported
  • Edge 132 Released on 2025-01-17
  • Firefox Not supported Position: negative
  • Firefox for Android Not supported Position: negative
  • Safari Not supported
  • Safari on iOS Not supported

• Element timing

  Limited availability

  The element performance entry and the PerformanceElementTiming API measures the time to render elements that have the elementtiming attribute.

  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 Not supported Position: positive
  • Firefox for Android Not supported Position: positive
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• Eyedropper

  Limited availability

  The EyeDropper API opens an eyedropper tool, a color picker that allows users to select a color from their screen.

  Learn more

  • Chrome 96 Released on 2021-11-15
  • Chrome Android Not supported
  • Edge 96 Released on 2021-11-19
  • Firefox Not supported Position
  • Firefox for Android Not supported Position
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• Feature policy

  The Feature-Policy response header sets whether a policy-controlled feature, such as an API, may be used in a document. Not to be confused with permissions policy.

  Learn more

  • Chrome 74 Released on 2019-04-23
  • Chrome Android 74 Released on 2019-04-24
  • Edge 79 Released on 2020-01-15
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Federated credential management

  Limited availability

  The IdentityCredential API delegates authentication to a third-party identity provider, instead of using third-party cookies. Also known as FedCM.

  Learn more

  • Chrome 116 Released on 2023-08-15
  • Chrome Android 116 Released on 2023-08-15
  • Edge 116 Released on 2023-08-21
  • Firefox Not supported Position: neutral
  • Firefox for Android Not supported Position: neutral
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• Federated credentials

  Limited availability

  The FederatedCredential API represents the details required to authenticate a user using a third-party identity provider. Not to be confused with federated credential management (FedCM).

  Learn more

  • Chrome 51 Released on 2016-05-25
  • Chrome Android 51 Released on 2016-06-08
  • Edge 79 Released on 2020-01-15
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• <fencedframe>

  Limited availability

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

  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 Not supported Position: negative
  • Firefox for Android Not supported Position: negative
  • Safari Not supported Position: blocked
  • Safari on iOS Not supported Position: blocked

• Fetch upload streams

  Limited availability

  The fetch() method and Request() constructor accept a ReadableStream object as the request's body option, to stream upload data to the server.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• fetchLater

  Limited availability

  The fetchLater() method requests a deferred fetch sent at an unknown time. The browser chooses a reliable time to send the request, ideally when the document is unloaded, and ignores the response. This API is useful for sending beacons to a server without expecting a particular response.

  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 Not supported Position: positive
  • Firefox for Android Not supported Position: positive
  • Safari Not supported Position: support
  • Safari on iOS Not supported Position: support

• File system access

  Limited availability

  The showOpenFilePicker(), showDirectoryPicker(), and showSaveFilePicker() methods request access to files and directories on the user's device and returns a handle for reading and writing to them.

  Learn more

  • Chrome 86 Released on 2020-10-20
  • Chrome Android 132 Released on 2025-01-14
  • Edge 86 Released on 2020-10-09
  • Firefox Not supported Position: negative
  • Firefox for Android Not supported Position: negative
  • Safari Not supported Position: oppose
  • Safari on iOS Not supported Position: oppose

• font-palette animation

  Limited availability

  You can animate color fonts between two font-palette values.

  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 Not supported Position
  • Firefox for Android Not supported Position
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• @function

  Limited availability

  The @function CSS at-rule defines a custom function that takes CSS values or custom properties as arguments, and returns a CSS value. It can be based on conditional logic such as by using the @media at-rule.

  Learn more

  • Chrome 139 Released on 2025-08-05
  • Chrome Android 139 Released on 2025-08-05
  • Edge 139 Released on 2025-08-07
  • Firefox Not supported Position
  • Firefox for Android Not supported Position
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• Gap decorations

  Limited availability

  The column-rule and row-rule CSS properties display decorative lines between columns and rows of a flex, grid, or multi-column layout. The rule-break, rule-outset, and rule-paint-order properties control the appearance of these lines.

  Learn more

  • Chrome 149 Released on 2026-06-02
  • Chrome Android 149 Released on 2026-06-02
  • Edge 149 Released on 2026-06-04
  • Firefox Not supported Position: positive
  • Firefox for Android Not supported Position: positive
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• <geolocation>

  Limited availability

  The <geolocation> HTML element represents a button that, upon activation, prompts the user to choose whether to grant the page access to geolocation data.

  Learn more

  • Chrome 144 Released on 2026-01-13
  • Chrome Android 144 Released on 2026-01-13
  • Edge 144 Released on 2026-01-21
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• IndexedDB getAllRecords()

  Limited availability

  The getAllRecords() method of IDBObjectStore and IDBIndex return records and their primary keys from an IndexedDB store or index. The records can be read in batches and in reverse order. The getAllRecords() methods speed up read operations on large datasets.

  Learn more

  • Chrome 141 Released on 2025-09-30
  • Chrome Android 141 Released on 2025-09-30
  • Edge 141 Released on 2025-10-03
  • Firefox Not supported Position: positive
  • Firefox for Android Not supported Position: positive
  • Safari Not supported Position: support
  • Safari on iOS Not supported Position: support

• Gyroscope

  Limited availability

  The Gyroscope API reads the angular velocity of a device in three dimensions.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported Position: oppose
  • Safari on iOS Not supported Position: oppose

• :host-context()

  The :host-context() CSS pseudo-class selects the containing element of the shadow tree in which it is used if that element or an ancestor matches the provided selector.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Idle detection

  Limited availability

  The IdleDetector API is used to notify a webpage of the user's idle, active, and locked state.

  Learn more

  • Chrome 94 Released on 2021-09-21
  • Chrome Android 94 Released on 2021-09-21
  • Edge 114 Released on 2023-06-02
  • Firefox Not supported Position: negative
  • Firefox for Android Not supported Position: negative
  • Safari Not supported
  • Safari on iOS Not supported

• if()

  Limited availability

  The if() CSS function is an inline conditional value that returns a value based on a set of conditions.

  Learn more

  • Chrome 137 Released on 2025-05-27
  • Chrome Android 137 Released on 2025-05-27
  • Edge 137 Released on 2025-05-29
  • Firefox Not supported Position
  • Firefox for Android Not supported Position
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• Credentialless iframes

  Limited availability

  The credentialless attribute for the <iframe> HTML element loads third-party content in an ephemeral context and does not send any credentials such as cookies. When using cross-origin isolation, this allows you to embed content that does not send Cross-Origin-Embedder-Policy headers.

  Learn more

  • Chrome 110 Released on 2023-02-07
  • Chrome Android 110 Released on 2023-02-07
  • Edge 110 Released on 2023-02-09
  • Firefox Not supported Position
  • Firefox for Android Not supported Position
  • Safari Not supported
  • Safari on iOS Not supported

• initial-letter

  Limited availability

  The initial-letter CSS property sets the number of lines the first letter of an element occupies. You can use the property to make a raised capital or drop cap.

  Learn more

  • Chrome 110 Released on 2023-02-07
  • Chrome Android 110 Released on 2023-02-07
  • Edge 110 Released on 2023-02-09
  • Firefox Not supported Position
  • Firefox for Android Not supported Position
  • Safari Not supported Position: support
  • Safari on iOS Not supported Position: support

• Ink

  Limited availability

  The navigator.ink API uses the system compositor to draw to a <canvas> element ahead of pointer events, reducing the delay between moving a stylus or cursor and a pen stroke appearing on screen.

  Learn more

  • Chrome 94 Released on 2021-09-21
  • Chrome Android 94 Released on 2021-09-21
  • Edge 93 Released on 2021-09-02
  • Firefox Not supported Position
  • Firefox for Android Not supported Position
  • Safari Not supported
  • Safari on iOS Not supported

• interactivity

  Limited availability

  The interactivity: inert CSS declaration makes an element and its descendants inert, like when using the inert HTML attribute. Inert elements can't be focused or clicked, their text can't be selected or found using the browser's find-in-page feature.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Interest invokers

  Limited availability

  Interest invokers, registered by the interestfor HTML attribute, trigger events and actions on a target element when a user shows interest in the element, through behaviors such as hover, focus, or long-press. Pseudo-elements apply styles to sources and targets of interest.

  Learn more

  • Chrome 142 Released on 2025-10-28
  • Chrome Android 142 Released on 2025-10-28
  • Edge 142 Released on 2025-10-31
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• interpolate-size

  Limited availability

  The interpolate-size CSS property sets whether animations and transitions interpolate between a numeric value and a keyword value, such as from a fixed length to auto or fit-content.

  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 Not supported Position: positive
  • Firefox for Android Not supported Position: positive
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• Intersection observer visibility tracking

  Limited availability

  The trackVisibility parameter for the IntersectionObserver constructor enables tracking the visibility of an element, to detect if it may be obscured by other content or visual effects. Also known as IntersectionObserver v2.

  Learn more

  • Chrome 74 Released on 2019-04-23
  • Chrome Android 74 Released on 2019-04-24
  • Edge 79 Released on 2020-01-15
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• isInputPending()

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

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• justify-self in block layouts

  Limited availability

  The justify-self CSS property aligns an item along a container's inline axis in block layouts, like it does in grid layouts. Likewise, the justify-items property sets a default justify-self value for all items in a container in a block layout.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Keyboard lock

  Limited availability

  The navigator.keyboard.lock() API allows you to capture keys that are normally reserved by the operating system. It can be used to provide an immersive fullscreen experience such as games.

  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 Not supported Position: negative
  • Firefox for Android Not supported Position: negative
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• Keyboard map

  Limited availability

  The navigator.keyboard.getLayoutMap() API returns a map from key codes to human readable key names. It can be used to describe buttons to the user when using the keyboard as a set of buttons, such as in games.

  Learn more

  • Chrome 69 Released on 2018-09-04
  • Chrome Android 69 Released on 2018-09-04
  • Edge 79 Released on 2020-01-15
  • Firefox Not supported Position: negative
  • Firefox for Android Not supported Position: negative
  • Safari Not supported
  • Safari on iOS Not supported

• Language detector

  Limited availability

  The LanguageDetector API identifies the likely natural language that some text is written in. You can use this API to supplement machine translation when the source source language is not known.

  Learn more

  • Chrome 138 Released on 2025-06-24
  • Chrome Android Not supported
  • Edge 148 Released on 2026-05-07
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• LanguageModel

  Limited availability

  The LanguageModel API prompts an on-device language model. Also known as the Prompt API.

  Learn more

  • Chrome 148 Released on 2026-05-05
  • Chrome Android Not supported
  • Edge Not supported
  • Firefox Not supported Position: negative
  • Firefox for Android Not supported Position: negative
  • Safari Not supported Position: oppose
  • Safari on iOS Not supported Position: oppose

• Layout instability

  Limited availability

  The layout-shift performance entry and LayoutShift API measures the layout stability of web pages based on movements of the elements on the page. They're used to calculate Cumulative Layout Shift (CLS), a common metric for perceived stability.

  Learn more

  • Chrome 84 Released on 2020-07-27
  • Chrome Android 84 Released on 2020-07-27
  • Edge 84 Released on 2020-07-16
  • Firefox Not supported Position: positive
  • Firefox for Android Not supported Position: positive
  • Safari Not supported
  • Safari on iOS Not supported

• <link rel="expect">

  Limited availability

  The rel="expect" attribute for the <link> HTML element is a hint to the browser to block rendering until the element that the href value references is connected to the document and fully parsed.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Local fonts

  Limited availability

  The window.queryLocalFonts() method returns an array of locally-installed fonts, each represented by a FontData object.

  Learn more

  • Chrome 103 Released on 2022-06-21
  • Chrome Android Not supported
  • Edge 103 Released on 2022-06-23
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Local network access

  Limited availability

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

  Learn more

  • Chrome 142 Released on 2025-10-28
  • Chrome Android 142 Released on 2025-10-28
  • Edge 142 Released on 2025-10-31
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Long animation frames

  Limited availability

  The long-animation-frame performance event type and the PerformanceLongAnimationFrameTiming API provide information about rendering updates that take longer than 50 milliseconds. Also known as LoAFs.

  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 Not supported Position: positive
  • Firefox for Android Not supported Position: positive
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• Long tasks

  Limited availability

  The longtask performance event type and the PerformanceLongTaskTiming API provides information about tasks that occupy the UI thread for 50 milliseconds or more, a metric for input latency, delayed animations, and other sources of "jank."

  Learn more

  • Chrome 58 Released on 2017-04-19
  • Chrome Android 58 Released on 2017-04-25
  • Edge 79 Released on 2020-01-15
  • Firefox Not supported Position
  • Firefox for Android Not supported Position
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• Memory measurement

  Limited availability

  The measureUserAgentSpecificMemory() method estimates the memory usage of a web application including all its iframes and workers.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• <meta name="application-title">

  Limited availability

  The name="application-title" attribute for the <meta> HTML element sets an installed web application's title bar text.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• <meta name="text-scale">

  Limited availability

  The <meta name="text-scale" content="scale" /> HTML element allows the browser's initial font size to be affected by the operating system text scale settings. The <meta name="text-scale" content="legacy" /> element is the default behavior that respects only browser font-size settings.

  Learn more

  • Chrome 146 Released on 2026-03-10
  • Chrome Android 146 Released on 2026-03-10
  • Edge 146 Released on 2026-03-13
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Navigation timing confidence

  Limited availability

  The confidence property of a navigation timing entry describes whether the navigation metric is likely to be representative the page's performance (high confidence) or affected by transient conditions, such as browser startup (low confidence).

  Learn more

  • Chrome 145 Released on 2026-02-10
  • Chrome Android 145 Released on 2026-02-10
  • Edge 145 Released on 2026-02-14
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Network Information

  Limited availability

  The navigator.connection API provides information about the network connection a device is using and fires events when the connection type changes.

  Learn more

  • Chrome Not supported
  • Chrome Android 67 Released on 2018-05-31
  • Edge Not supported
  • Firefox Not supported Position: negative
  • Firefox for Android Not supported Position: negative
  • Safari Not supported
  • Safari on iOS Not supported

• Non-cookie storage access

  Limited availability

  Non-cookie storage access extends the requestStorageAccess() API to let content in cross-site iframes request access to first-party data beyond cookies.

  Learn more

  • Chrome 125 Released on 2024-05-14
  • Chrome Android Not supported
  • Edge Not supported
  • Firefox Not supported Position: positive
  • Firefox for Android Not supported Position: positive
  • Safari Not supported
  • Safari on iOS Not supported

• object-view-box

  Limited availability

  The object-view-box CSS property crops and zooms to an inset area of an image.

  Learn more

  • Chrome 104 Released on 2022-08-02
  • Chrome Android 104 Released on 2022-08-02
  • Edge 104 Released on 2022-08-05
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Observable

  Limited availability

  The when() method on a event target returns an Observable object, which provides a declarative API for subscribing to and operating on events. It's an alternative to addEventListener() callbacks.

  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 Not supported Position: negative
  • Firefox for Android Not supported Position: negative
  • Safari Not supported Position: support
  • Safari on iOS Not supported Position: support

• Orientation Sensor

  Limited availability

  The AbsoluteOrientationSensor and RelativeOrientationSensor APIs describe the physical orientation of a device in three-dimensional space, either in relation to the Earth's coordinate system or in relation to the device's own orientation, respectively.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported Position: oppose
  • Safari on iOS Not supported Position: oppose

• overlay

  Limited availability

  The overlay CSS property, used as an allow-discrete CSS transition, prevents a top layer element, such as a popover or a <dialog>, from being removed from the top layer before it has finished animating. You can't set the value of the overlay property; only use it as transition property.

  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 Not supported Position
  • Firefox for Android Not supported Position
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• OVR_multiview2 WebGL extension

  Limited availability

  The OVR_multiview2 extension for WebGL 2.0 contexts renders into multiple views simultaneously. This especially useful for virtual reality (VR) and WebXR.

  Learn more

  • Chrome Not supported
  • Chrome Android 93 Released on 2021-08-31
  • Edge Not supported
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Page break aliases

  The page-break-before, page-break-inside, and page-break-after CSS properties are aliases to the break-before, break-inside, and break-after properties.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Page lifecycle

  Limited availability

  The page lifecycle API helps you safely handle page suspensions or discards from memory. The freeze and resume events fire when the browser suspends or resumes a page from memory while the document.wasDiscarded property reports whether the page was reloaded after being dropped.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Page visibility state

  Limited availability

  The visibility-state performance entry and the VisibilityStateEntry API measure the timing of page visibility state changes, such as when a tab is no longer visible or the user has switched to another app.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• paint()

  Limited availability

  The paint() CSS function creates a custom image, drawn using a paint worklet, for an element's background or border.

  Learn more

  • Chrome 65 Released on 2018-03-06
  • Chrome Android 65 Released on 2018-03-06
  • Edge 79 Released on 2020-01-15
  • Firefox Not supported Position: positive
  • Firefox for Android Not supported Position: positive
  • Safari Not supported
  • Safari on iOS Not supported

• Partitioned cookies

  Limited availability

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

  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 Not supported Position: positive
  • Firefox for Android Not supported Position: positive
  • Safari Not supported Position: support
  • Safari on iOS Not supported Position: support

• Password credentials

  Limited availability

  The PasswordCredential API represents a username and password.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Payment handler

  Limited availability

  The payment handler API registers a web application as a payment handler and responds to payment requests in the browser's user interface, rather than redirecting users to a separate site to complete a payment.

  Learn more

  • Chrome 70 Released on 2018-10-16
  • Chrome Android 70 Released on 2018-10-17
  • Edge 79 Released on 2020-01-15
  • Firefox Not supported Position: defer
  • Firefox for Android Not supported Position: defer
  • Safari Not supported
  • Safari on iOS Not supported

• Periodic background sync

  Limited availability

  The periodic background synchronization API fires a recurring periodicsync event in a service worker. You can use this to update data in the background at regular intervals.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Permissions policy

  Limited availability

  The Permissions-Policy response header and the allow attribute for <iframe> elements sets whether a policy-controlled feature, such as an API, may be used in a document.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• prefers-reduced-transparency media query

  Limited availability

  The prefers-reduced-transparency CSS media query sets styles based on whether the user prefers to reduce the amount of transparent effects on their device, for example to improve contrast and legibility.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• Presentation API

  Limited availability

  The Presentation API shows or controls content on another display, such as a network-connected TV or projector.

  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 Not supported Position
  • Firefox for Android Not supported Position
  • Safari Not supported
  • Safari on iOS Not supported

• Profiler

  Limited availability

  The Profiler API records data about the execution of a page, which you can send to a server for later analysis. Also known as self-profiling.

  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 Not supported Position
  • Firefox for Android Not supported Position
  • Safari Not supported
  • Safari on iOS Not supported

• Protected audience

  The protected audience API facilitates advertisement sales by allowing sites to register users as part of an interest group or to choose which ads appear based on those interest groups, while minimizing the ability of advertisers to track specific members of the interest group. Also known as FLEDGE.

  Learn more

  • Chrome 134 Released on 2025-03-04
  • Chrome Android 134 Released on 2025-03-04
  • Edge Not supported
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• reading-flow

  Limited availability

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

  Learn more

  • Chrome 137 Released on 2025-05-27
  • Chrome Android 137 Released on 2025-05-27
  • Edge 137 Released on 2025-05-29
  • Firefox Not supported Position
  • Firefox for Android Not supported Position
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• Region capture

  Limited availability

  When using navigator.mediaDevices.getDisplayMedia() to capture a browser tab as a video stream, the region capture API allows you to crop the video to the bounding box of a given element. In contrast to the element capture API, any content that overlays that element is also captured.

  Learn more

  • Chrome 104 Released on 2022-08-02
  • Chrome Android Not supported
  • Edge 104 Released on 2022-08-05
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Related apps

  Limited availability

  The related_applications web app manifest member lists operating system-specific applications that are related to the current web app, such as an Android app that provides similar functionality. The getInstalledRelatedApps() method lists which of those are installed on the current device.

  Learn more

  • Chrome Not supported
  • Chrome Android 84 Released on 2020-07-27
  • Edge 85 Released on 2020-08-27
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Related website sets

  Related website sets declares relationships between sites so the browser allows cookie and storage access between them through methods such as document.requestStorageAccessFor().

  Learn more

  • Chrome 119 Released on 2023-10-31
  • Chrome Android 120 Released on 2023-12-05
  • Edge 119 Released on 2023-11-02
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• COEP violation reports

  Limited availability

  COEP violation reporting sends a report to a URL nominated by the Reporting-Endpoints header or the ReportingObserver API when a page violates its Cross-Origin-Embedder-Policy policy.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Crash report storage

  Limited availability

  The window.crashReport object is a key-value store to record information about your application's state. If there's a crash, then the data in the key-value store is sent to your crash reporting endpoint, to help you pinpoint the cause of the crash.

  Learn more

  • Chrome 145 Released on 2026-02-10
  • Chrome Android 145 Released on 2026-02-10
  • Edge 145 Released on 2026-02-14
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Deprecation reports

  Limited availability

  Deprecation reporting sends a report to a URL nominated by the Reporting-Endpoints header or the ReportingObserver API when a page uses a deprecated API or other browser feature.

  Learn more

  • Chrome 69 Released on 2018-09-04
  • Chrome Android 69 Released on 2018-09-04
  • Edge 79 Released on 2020-01-15
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Intervention reports

  Intervention reporting sends a report to a URL nominated by the Reporting-Endpoints header when the browser has not honored an application's request, contrary to specified behavior, such as for security or privacy reasons.

  Learn more

  • Chrome 69 Released on 2018-09-04
  • Chrome Android 69 Released on 2018-09-04
  • Edge 79 Released on 2020-01-15
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Permissions policy violation reporting

  Limited availability

  Permissions policy violation reporting sends a report to a URL nominated by the Reporting-Endpoints header or the ReportingObserver API when a page violates a policy. You can also use the Permissions-Policy-Report-Only header to receive reports of what might break under a given policy.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Save-Data

  Limited availability

  Browsers send the Save-Data HTTP request header when the user turns on a data-saving mode. It is a hint to reduce data sent to the browser. Servers should respond with alternative content, such as smaller images and videos, or different markup and styling.

  Learn more

  • Chrome 65 Released on 2018-03-06
  • Chrome Android 65 Released on 2018-03-06
  • Edge 79 Released on 2020-01-15
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• scroll-initial-target

  Limited availability

  The scroll-initial-target: nearest CSS declaration sets the initial scroll position of its scroll container to the top of the element, much like scrolling to a URL fragment.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• scrollIntoView() container

  Limited availability

  The container option of the scrollIntoView() method sets which ancestor scroll container to scroll. The "nearest" value scrolls only the nearest ancestor, instead of the default "all".

  Learn more

  • Chrome 140 Released on 2025-09-02
  • Chrome Android 140 Released on 2025-09-02
  • Edge 140 Released on 2025-09-05
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Scroll marker target pseudo-classes

  Limited availability

  The :target-current CSS pseudo-class selects the active scroll marker (as in ::scroll-marker), while the :target-after and :target-before pseudo-classes select the inactive markers preceding and following the active scroll marker.

  Learn more

  • Chrome 142 Released on 2025-10-28
  • Chrome Android 142 Released on 2025-10-28
  • Edge 142 Released on 2025-10-31
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Scroll markers

  Limited availability

  A scroll marker scrolls a container to a scroll target. The ::scroll-marker CSS pseudo-element selects a scroll marker in a ::scroll-marker-group pseudo-element, generated before or after the scroll container. You can use them to navigate and style tables of contents, tab panels, and carousels.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Scroll snap events

  Limited availability

  The scrollsnapchanging and scrollsnapchange events fire when a scroll gesture changes the selected scroll snap target.

  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 Not supported Position
  • Firefox for Android Not supported Position
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• scroll-target-group

  Limited availability

  The scroll-target-group CSS property sets the container where anchor links act as scroll markers. Using selectors such as :target-current, you can style elements when a target has scrolled into view. It's an alternative to the ::scroll-marker-group pseudo-element, which generates scroll markers.

  Learn more

  • Chrome 140 Released on 2025-09-02
  • Chrome Android 140 Released on 2025-09-02
  • Edge 140 Released on 2025-09-05
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Secure payment confirmation

  Limited availability

  The payment extension of a web authentication credential allows a relying party (such as a bank) to create a credential that can be queried by any merchant origin as part of an online checkout that uses the Payment Request API's secure-payment-confirmation payment method. Also known as SPC.

  Learn more

  • Chrome 139 Released on 2025-08-05
  • Chrome Android 139 Released on 2025-08-05
  • Edge 139 Released on 2025-08-07
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Service workers static routing

  Limited availability

  The service worker install event's addRoutes method declares resource paths that should either be fetched from the network or the cache, to bypass the service worker and improve performance.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Shared storage locks

  The withLock option to set(), append(), delete(), clear(), and batchUpdate() methods of the sharedStorage API prevents duplicate reporting from cross-site race conditions.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Signature-based resource integrity

  Limited availability

  Signature-based resource integrity verifies a script's provenance by checking that the resource has been signed with a trusted key given by the <script> element's integrity attribute.

  Learn more

  • Chrome 141 Released on 2025-09-30
  • Chrome Android 141 Released on 2025-09-30
  • Edge 141 Released on 2025-10-03
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Speculation rules

  Limited availability

  Speculation rules are hints to the browser to proactively download pages in the background so they appear instantly when the user navigates to them.

  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 Not supported Position: neutral
  • Firefox for Android Not supported Position: neutral
  • Safari Not supported
  • Safari on iOS Not supported

• Speech recognition

  Limited availability

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

  Learn more

  • Chrome 139 Released on 2025-08-05
  • Chrome Android 139 Released on 2025-08-05
  • Edge 139 Released on 2025-08-07
  • Firefox Not supported Position
  • Firefox for Android Not supported Position
  • Safari Not supported
  • Safari on iOS Not supported

• Storage buckets

  Limited availability

  The navigator.storageBuckets API allows you to organize locally stored data into groups called storage buckets. Each bucket can have different settings, allowing the browser to manage and delete buckets independently rather than applying the same treatment to all.

  Learn more

  • Chrome 122 Released on 2024-02-20
  • Chrome Android 122 Released on 2024-02-20
  • Edge 122 Released on 2024-02-23
  • Firefox Not supported Position: positive
  • Firefox for Android Not supported Position: positive
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• stretch

  Limited availability

  The stretch CSS keyword expands a box as needed to fit its contents until the maximum size is reached, without preserving the content's preferred aspect ratio.

  Learn more

  • Chrome 138 Released on 2025-06-24
  • Chrome Android 138 Released on 2025-06-24
  • Edge 138 Released on 2025-06-26
  • Firefox Not supported Position: positive
  • Firefox for Android Not supported Position: positive
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• Range syntax for style queries

  Limited availability

  The @container style() CSS at-rule and if(style()) CSS function queries accept a range syntax, such as >, <, >=, <=, to query for inexact values.

  Learn more

  • Chrome 142 Released on 2025-10-28
  • Chrome Android 142 Released on 2025-10-28
  • Edge 142 Released on 2025-10-31
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Summarizer

  Limited availability

  The Summarizer API uses an on-device language model to summarize text.

  Learn more

  • Chrome 138 Released on 2025-06-24
  • Chrome Android Not supported
  • Edge 138 Released on 2025-06-26
  • Firefox Not supported Position: negative
  • Firefox for Android Not supported Position: negative
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• text-decoration in ::selection

  Limited availability

  The text-decoration CSS property in a ::selection rule sets the underline and other text decoration styles on the text a user has highlighted.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• text-size-adjust

  Limited availability

  The text-size-adjust CSS property disables or modifies the browser's default text size adjustment for small screen sizes.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• text-spacing-trim

  Limited availability

  The text-spacing-trim CSS property controls spacing around CJK characters, avoiding excessive whitespace when using full-width punctuation characters.

  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 Not supported Position
  • Firefox for Android Not supported Position
  • Safari Not supported
  • Safari on iOS Not supported

• Topics

  The topics API reports a user's likely subject-matter interests (as determined by the browser, known as topics) to iframes. This allows for interest-based advertising that does not rely on user's exact browsing history, third-party cookies, or fingerprinting.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Translator

  Limited availability

  The Translator API translates some text from one natural language to another, using machine translation.

  Learn more

  • Chrome 138 Released on 2025-06-24
  • Chrome Android Not supported
  • Edge 148 Released on 2026-05-07
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• User agent client hints

  Limited availability

  The Sec-CH-UA HTTP request header and the navigator.userAgentData API expose browser and platform information used to vary responses and application logic. User agent client hints are similar to user agent strings but more privacy-preserving and safer to parse.

  Learn more

  • Chrome 90 Released on 2021-04-13
  • Chrome Android 90 Released on 2021-04-13
  • Edge 90 Released on 2021-04-15
  • Firefox Not supported Position: neutral
  • Firefox for Android Not supported Position: neutral
  • Safari Not supported Position: blocked
  • Safari on iOS Not supported Position: blocked

• Vibration

  Limited availability

  The navigator.vibrate() method makes a tactile alert, if the device is equipped with a haptic motor.

  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 Not supported Position
  • Firefox for Android Not supported Position
  • Safari Not supported Position: oppose
  • Safari on iOS Not supported Position: oppose

• Element-scoped view transitions

  Limited availability

  The startViewTransition() method of an Element object starts a view transition that affects only that element's DOM tree. You can use this to run separate elements' transitions concurrently.

  Learn more

  • Chrome 147 Released on 2026-04-07
  • Chrome Android 147 Released on 2026-04-07
  • Edge 147 Released on 2026-04-10
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Viewport segments

  Limited availability

  The viewport segment CSS environment variables and media features, and the viewport.segments API, allow you to adapt your layout to devices where the display is split, such as on foldable devices.

  Learn more

  • Chrome 138 Released on 2025-06-24
  • Chrome Android 138 Released on 2025-06-24
  • Edge 138 Released on 2025-06-26
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Virtual keyboard

  Limited availability

  The navigator.virtualKeyboard API inspects and controls on-screen virtual keyboards. You can use it to programmatically hide or show a virtual keyboard or respond to the keyboard disappearing or appearing.

  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 Not supported Position
  • Firefox for Android Not supported Position
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• Virtual pressure sources

  Limited availability

  The CreateVirtualPressureSource WebDriver command creates artificial sources of compute pressure for testing without the need real device sources of compute pressure.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported Position: oppose
  • Safari on iOS Not supported Position: oppose

• Virtual sensors

  Limited availability

  The CreateVirtualSensor WebDriver command creates a virtual sensor for testing applications that use sensor APIs, without the need for real device sensors.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• JavaScript promise integration (WebAssembly)

  Limited availability

  The JavaScript promise integration (JSPI) suspends a WebAssembly module when it calls a JavaScript method that returns a promise. The module resumes when the promise is resolved. You can use this to call asynchronous Web APIs from synchronous WebAssembly.

  Learn more

  • Chrome 137 Released on 2025-05-27
  • Chrome Android Not supported
  • Edge 137 Released on 2025-05-29
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Web Bluetooth

  Limited availability

  The Web Bluetooth API enables selecting and communicating with nearby Bluetooth devices.

  Learn more

  • Chrome 70 Released on 2018-10-16
  • Chrome Android 56 Released on 2017-02-01
  • Edge 79 Released on 2020-01-15
  • Firefox Not supported Position: negative
  • Firefox for Android Not supported Position: negative
  • Safari Not supported
  • Safari on iOS Not supported

• Web NFC

  Limited availability

  The NDEFReader API reads and writes messages to near-field communication (NFC) tags.

  Learn more

  • Chrome Not supported
  • Chrome Android 100 Released on 2022-03-29
  • Edge Not supported
  • Firefox Not supported Position: negative
  • Firefox for Android Not supported Position: negative
  • Safari Not supported
  • Safari on iOS Not supported

• WebOTP

  Limited availability

  The OTPCredential API represents a one-time-password (OTP).

  Learn more

  • Chrome 93 Released on 2021-08-31
  • Chrome Android 84 Released on 2020-07-27
  • Edge 93 Released on 2021-09-02
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Desynchronized WebGL canvas

  Limited availability

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

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Desynchronized WebGL2 canvas

  Limited availability

  The optional desynchronized parameter of a canvas's getContext() method permits the browser to draw a WebGL2 canvas independently of the event loop. This can reduce drawing latency.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• WebHID

  Limited availability

  The WebHID API provides access to Human Interface Devices (HID) that are connected to the user's device.

  Learn more

  • Chrome 89 Released on 2021-03-02
  • Chrome Android Not supported
  • Edge 89 Released on 2021-03-04
  • Firefox Not supported Position: negative
  • Firefox for Android Not supported Position: negative
  • Safari Not supported
  • Safari on iOS Not supported

• WebUSB

  Limited availability

  The WebUSB API exposes USB compatible devices to web pages.

  Learn more

  • Chrome 61 Released on 2017-09-05
  • Chrome Android 61 Released on 2017-09-05
  • Edge 79 Released on 2020-01-15
  • Firefox Not supported Position: negative
  • Firefox for Android Not supported Position: negative
  • Safari Not supported Position: oppose
  • Safari on iOS Not supported Position: oppose

• Anchors (WebXR)

  Limited availability

  An XRAnchor object keeps track of a pose that is fixed relative to the real world. Anchors build an illusion that the placed objects are really present in the user's environment.

  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 Not supported Position: defer
  • Firefox for Android Not supported Position: defer
  • Safari Not supported
  • Safari on iOS Not supported

• Augmented reality

  Limited availability

  The "immersive-ar" value for navigator.xr.requestSession() starts an augmented reality WebXR session that renders content aligned with the visible environment.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Raw camera access for WebXR

  Limited availability

  The XRView.camera property provides direct access to pose-synchronized camera images within a WebXR session.

  Learn more

  • Chrome 107 Released on 2022-10-25
  • Chrome Android 107 Released on 2022-10-25
  • Edge 107 Released on 2022-10-27
  • Firefox Not supported Position: defer
  • Firefox for Android Not supported Position: defer
  • Safari Not supported Position: oppose
  • Safari on iOS Not supported Position: oppose

• Depth sensing

  Limited availability

  An XRDepthInformation object represents a measurement of the distance from the user's device to the real-world geometry in the user's environment.

  Learn more

  • Chrome 90 Released on 2021-04-13
  • Chrome Android 90 Released on 2021-04-13
  • Edge 90 Released on 2021-04-15
  • Firefox Not supported Position: defer
  • Firefox for Android Not supported Position: defer
  • Safari Not supported
  • Safari on iOS Not supported

• WebXR

  Limited availability

  The navigator.xr API represents the browser's virtual reality or augmented reality system. You can use to request a WebXR session.

  Learn more

  • Chrome 79 Released on 2019-12-10
  • Chrome Android 79 Released on 2019-12-17
  • Edge 79 Released on 2020-01-15
  • Firefox Not supported Position: positive
  • Firefox for Android Not supported Position: positive
  • Safari Not supported Position
  • Safari on iOS Not supported Position

• DOM overlays for WebXR

  Limited availability

  A DOM overlay shows 2D DOM content as an interactive, transparent layer on top of a WebXR application's WebGL content and camera image.

  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 Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Gamepad (WebXR)

  Limited availability

  The gamepad attribute of an XRInputSource represents an XR input device, such as a motion controller, that reports data from physical inputs (such as buttons, touch pads, and triggers).

  Learn more

  • Chrome 79 Released on 2019-12-10
  • Chrome Android 79 Released on 2019-12-17
  • Edge 79 Released on 2020-01-15
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Hand input

  Limited availability

  An XRHand object, from the hand attribute of an XRInputSource object, represents a WebXR session's fully-articulated hand tracking model.

  Learn more

  • Chrome 131 Released on 2024-11-12
  • Chrome Android 131 Released on 2024-11-12
  • Edge Not supported
  • Firefox Not supported Position: defer
  • Firefox for Android Not supported Position: defer
  • Safari Not supported Position: support
  • Safari on iOS Not supported Position: support

• Hit test

  Limited availability

  The getHitTestResults() method of an XRFrame object helps place objects in an augmented reality session by finding where cast rays intersect with real-world geometry.

  Learn more

  • Chrome 81 Released on 2020-04-07
  • Chrome Android 81 Released on 2020-04-07
  • Edge 81 Released on 2020-04-13
  • Firefox Not supported Position: defer
  • Firefox for Android Not supported Position: defer
  • Safari Not supported
  • Safari on iOS Not supported

• Layers (WebXR)

  Limited availability

  WebXR layer types, such as XRCylinderLayer, XRCylinderLayer, XREquirectLayer, XRProjectionLayer or XRQuadLayer, are managed by the system compositor, to reduce latency or resampling.

  Learn more

  • Chrome 147 Released on 2026-04-07
  • Chrome Android 147 Released on 2026-04-07
  • Edge 147 Released on 2026-04-10
  • Firefox Not supported Position: defer
  • Firefox for Android Not supported Position: defer
  • Safari Not supported
  • Safari on iOS Not supported

• Lighting estimation

  Limited availability

  The XRLightProbe and XRLightEstimate objects represent real-world environmental lighting conditions during a WebXR session.

  Learn more

  • Chrome 90 Released on 2021-04-13
  • Chrome Android 90 Released on 2021-04-13
  • Edge 90 Released on 2021-04-15
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• Window Controls Overlay

  Limited availability

  The display_override: ["window-controls-overlay"] web application manifest member shows content in the title bar area of a progressive web app that is installed on a desktop device.

  Learn more

  • Chrome 105 Released on 2022-09-02
  • Chrome Android Not supported
  • Edge 105 Released on 2022-09-01
  • Firefox Not supported Position: defer
  • Firefox for Android Not supported Position: defer
  • Safari Not supported
  • Safari on iOS Not supported

• Window management

  Limited availability

  The window.getScreenDetails() method gets information about the screens on a device, which you can use to place new windows on a specific screen with window.open().

  Learn more

  • Chrome 111 Released on 2023-03-07
  • Chrome Android Not supported
  • Edge 111 Released on 2023-03-13
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported
  • Safari on iOS Not supported

• word-break: auto-phrase

  Limited availability

  The word-break: auto-phrase CSS declaration specifies that wrapping should occur at natural phrase boundaries, especially in CJK languages.

  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 Not supported Position
  • Firefox for Android Not supported Position
  • Safari Not supported
  • Safari on iOS Not supported