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

• Features only in:
• Chromium
• Firefox
• Safari

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

Features 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 ❌
  • Firefox for Android ❌
  • Safari ❌ Vendor position : oppose (concerns: duplication, privacy, venue, use cases, power, device independence)
  • Safari on iOS ❌ Vendor position : oppose (concerns: duplication, privacy, venue, use cases, power, device independence)

• 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 ❌
  • Edge 102 Released on 2022-05-31
  • Firefox ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Edge 110 Released on 2023-02-09
  • Firefox ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Edge 96 Released on 2021-11-19
  • Firefox ❌ Vendor position : defer
  • Firefox for Android ❌ Vendor position : defer
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari ❌ Vendor position : neutral (concerns: security, integration)
  • Safari on iOS ❌ Vendor position : neutral (concerns: security, integration)

• Attribution reporting

  Limited availability

  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 ❌ Vendor position : unknown
  • Firefox for Android ❌ Vendor position : unknown
  • Safari ❌ Vendor position : unknown
  • Safari on iOS ❌ Vendor position : unknown

• 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 ❌ Vendor position : unknown
  • Firefox for Android ❌ Vendor position : unknown
  • Safari ❌ Vendor position : unknown (concerns: privacy, maintenance)
  • Safari on iOS ❌ Vendor position : unknown (concerns: privacy, maintenance)

• 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 ❌ Vendor position : negative
  • Firefox for Android ❌ Vendor position : negative
  • Safari ❌
  • Safari on iOS ❌

• Barcode detector

  Limited availability

  The BarcodeDetector API recognizes various barcode formats in images.

  Learn more

  • Chrome ❌
  • Chrome Android 83 Released on 2020-05-19
  • Edge ❌
  • Firefox ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari ❌ Vendor position : unknown
  • Safari on iOS ❌ Vendor position : unknown

• captureStream() for <audio> and <video>

  Limited availability

  The captureStream() method for <audio> and <video> elements returns a MediaStream for the media element's content. You can use this to record media or send it elsewhere, such as a canvas or WebRTC connection.

  Learn more

  • Chrome 62 Released on 2017-10-17
  • Chrome Android 62 Released on 2017-10-24
  • Edge 79 Released on 2020-01-15
  • Firefox ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• Custom formats for clipboard items

  Limited availability

  The web prefix for ClipboardItem data types (also known as MIME types) allows reading and writing ununsanitized 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 ❌
  • Firefox for Android ❌
  • Safari ❌ Vendor position : unknown
  • Safari on iOS ❌ Vendor position : unknown

• 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 ❌ Vendor position : unknown
  • Firefox for Android ❌ Vendor position : unknown
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : neutral
  • Firefox for Android ❌ Vendor position : neutral
  • Safari ❌
  • Safari on iOS ❌

• CloseWatcher

  Limited availability

  The CloseWatcher API listens and responds to close requests on in-page components, such as modals, popovers, and sidebars.

  Learn more

  • Chrome 126 Released on 2024-06-11
  • Chrome Android 126 Released on 2024-06-11
  • Edge 126 Released on 2024-06-13
  • Firefox ❌
  • Firefox for Android ❌
  • Safari ❌ Vendor position : neutral
  • Safari on iOS ❌ Vendor position : neutral

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• ::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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Edge 125 Released on 2024-05-17
  • Firefox ❌ Vendor position : unknown
  • Firefox for Android ❌ Vendor position : unknown
  • Safari ❌ Vendor position : oppose (concerns: privacy, device independence)
  • Safari on iOS ❌ Vendor position : oppose (concerns: privacy, device independence)

• 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 ❌
  • Chrome Android 80 Released on 2020-02-04
  • Edge ❌
  • Firefox ❌ Vendor position : defer
  • Firefox for Android ❌ Vendor position : defer
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• Content Index

  Limited availability

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

  Learn more

  • Chrome ❌
  • Chrome Android 84 Released on 2020-07-27
  • Edge ❌
  • Firefox ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : unknown
  • Firefox for Android ❌ Vendor position : unknown
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari ❌ Vendor position : support (concerns: integration)
  • Safari on iOS ❌ Vendor position : support (concerns: integration)

• 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 ❌ Vendor position : unknown
  • Firefox for Android ❌ Vendor position : unknown
  • Safari ❌ Vendor position : support
  • Safari on iOS ❌ Vendor position : support

• CSS import attributes

  Limited availability

  Module import … with { type: "css" } statements load CSS modules as constructable stylesheets. Also known as CSS module scripts.

  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 ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari ❌ Vendor position : support
  • Safari on iOS ❌ Vendor 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 ❌ Vendor position : positive (concerns: compatibility)
  • Firefox for Android ❌ Vendor position : positive (concerns: compatibility)
  • Safari ❌ Vendor position : support
  • Safari on iOS ❌ Vendor position : support

• Device memory

  Limited availability

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

  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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : unknown
  • Firefox for Android ❌ Vendor position : unknown
  • Safari ❌ Vendor position : unknown
  • Safari on iOS ❌ Vendor position : unknown

• Digital goods

  Limited availability

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

  Learn more

  • Chrome ❌
  • Chrome Android 101 Released on 2022-04-26
  • Edge 134 Released on 2025-03-06
  • Firefox ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• display-mode media query

  Limited availability

  The display-mode CSS media query sets styles based on whether the web page is in fullscreen, standalone, minimal-ui, browser, or picture-in-picture mode.

  Learn more

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

• Document picture-in-picture

  Limited availability

  The document picture-in-picture API creates an always-on-top window from arbitrary HTML content.

  Learn more

  • Chrome 130 Released on 2024-10-15
  • Chrome Android ❌
  • Edge 130 Released on 2024-10-17
  • Firefox ❌ Vendor position : positive (concerns: device independence)
  • Firefox for Android ❌ Vendor position : positive (concerns: device independence)
  • Safari ❌ Vendor position : unknown (concerns: portability, device independence)
  • Safari on iOS ❌ Vendor position : unknown (concerns: portability, device independence)

• 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 ❌ Vendor position : positive (concerns: compatibility, accessibility)
  • Firefox for Android ❌ Vendor position : positive (concerns: compatibility, accessibility)
  • Safari ❌ Vendor position : unknown
  • Safari on iOS ❌ Vendor position : unknown

• 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 ❌
  • Edge 132 Released on 2025-01-17
  • Firefox ❌ Vendor position : negative
  • Firefox for Android ❌ Vendor position : negative
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari ❌ Vendor position : unknown
  • Safari on iOS ❌ Vendor position : unknown

• 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 ❌
  • Edge 96 Released on 2021-11-19
  • Firefox ❌ Vendor position : unknown (concerns: integration, API design)
  • Firefox for Android ❌ Vendor position : unknown (concerns: integration, API design)
  • Safari ❌ Vendor position : unknown (concerns: API design, maintenance)
  • Safari on iOS ❌ Vendor position : unknown (concerns: API design, maintenance)

• 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 ❌ Vendor position : neutral
  • Firefox for Android ❌ Vendor position : neutral
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• <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 ❌ Vendor position : negative (concerns: complexity, privacy, security, use cases)
  • Firefox for Android ❌ Vendor position : negative (concerns: complexity, privacy, security, use cases)
  • Safari ❌ Vendor position : blocked
  • Safari on iOS ❌ Vendor position : blocked

• 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 ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari ❌ Vendor position : support (concerns: complexity, privacy, integration, venue, API design, maintenance)
  • Safari on iOS ❌ Vendor position : support (concerns: complexity, privacy, integration, venue, API design, maintenance)

• field-sizing

  Limited availability

  The field-sizing CSS property allows form controls such as <textarea> to be sized based on their content.

  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 ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari ❌ Vendor position : support
  • Safari on iOS ❌ Vendor 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 ❌ Vendor position : negative
  • Firefox for Android ❌ Vendor position : negative
  • Safari ❌ Vendor position : oppose (concerns: security)
  • Safari on iOS ❌ Vendor position : oppose (concerns: security)

• Math font family

  Limited availability

  The font-family: math CSS declaration uses the browser default font face for displaying mathematical expressions.

  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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : unknown
  • Firefox for Android ❌ Vendor position : unknown
  • Safari ❌ Vendor position : unknown
  • Safari on iOS ❌ Vendor position : unknown

• @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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌ Vendor position : oppose (concerns: duplication, privacy, venue, use cases, power, device independence)
  • Safari on iOS ❌ Vendor position : oppose (concerns: duplication, privacy, venue, use cases, power, device independence)

• Custom highlights from point

  Limited availability

  The CSS.highlights.highlightsFromPoint() method returns an array of Highlight objects at a specified point.

  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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• :host-context()

  Discouraged

  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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : negative
  • Firefox for Android ❌ Vendor position : negative
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : unknown
  • Firefox for Android ❌ Vendor position : unknown
  • Safari ❌ Vendor position : unknown
  • Safari on iOS ❌ Vendor position : unknown

• 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 ❌ Vendor position : unknown (concerns: venue)
  • Firefox for Android ❌ Vendor position : unknown (concerns: venue)
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : unknown
  • Firefox for Android ❌ Vendor position : unknown
  • Safari ❌ Vendor position : support
  • Safari on iOS ❌ Vendor 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 ❌ Vendor position : unknown
  • Firefox for Android ❌ Vendor position : unknown
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Edge 135 Released on 2025-04-04
  • Firefox ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari ❌ Vendor position : unknown
  • Safari on iOS ❌ Vendor position : unknown

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• isInputPending()

  Discouraged

  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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : unknown
  • Firefox for Android ❌ Vendor position : unknown
  • Safari ❌ Vendor position : unknown (concerns: compatibility, internationalization, security, integration, portability, API design, annoyance, device independence, accessibility, dependencies)
  • Safari on iOS ❌ Vendor position : unknown (concerns: compatibility, internationalization, security, integration, portability, API design, annoyance, device independence, accessibility, dependencies)

• 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 ❌ Vendor position : negative
  • Firefox for Android ❌ Vendor position : negative
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari ❌
  • Safari on iOS ❌

• <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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Edge 103 Released on 2022-06-23
  • Firefox ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari ❌ Vendor position : unknown
  • Safari on iOS ❌ Vendor position : unknown

• 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 ❌ Vendor position : unknown
  • Firefox for Android ❌ Vendor position : unknown
  • Safari ❌ Vendor position : unknown
  • Safari on iOS ❌ Vendor position : unknown

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• <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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• moveBefore()

  Limited availability

  The moveBefore() DOM method relocates a node while preserving its state. For example, you can move the active element without losing focus, move an animated element without resetting the animation, or move an iframe without reloading its content.

  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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• Navigation API

  Limited availability

  The navigation API initiates, intercepts, or modifies browser navigation actions. Not to be confused with the navigator API.

  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 ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari ❌ Vendor position : support
  • Safari on iOS ❌ Vendor position : support

• 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 67 Released on 2018-05-29
  • Chrome Android 67 Released on 2018-05-31
  • Edge ❌
  • Firefox ❌ Vendor position : negative
  • Firefox for Android ❌ Vendor position : negative
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Edge ❌
  • Firefox ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : unknown (concerns: complexity, venue)
  • Firefox for Android ❌ Vendor position : unknown (concerns: complexity, venue)
  • Safari ❌ Vendor position : support (concerns: venue)
  • Safari on iOS ❌ Vendor position : support (concerns: venue)

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌ Vendor position : oppose (concerns: duplication, privacy, venue, use cases, power, device independence)
  • Safari on iOS ❌ Vendor position : oppose (concerns: duplication, privacy, venue, use cases, power, device independence)

• 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 ❌ Vendor position : unknown
  • Firefox for Android ❌ Vendor position : unknown
  • Safari ❌ Vendor position : unknown
  • Safari on iOS ❌ Vendor position : unknown

• 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 ❌
  • Chrome Android 93 Released on 2021-08-31
  • Edge ❌
  • Firefox ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• Page break aliases

  Discouraged

  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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari ❌ Vendor position : support (concerns: performance)
  • Safari on iOS ❌ Vendor position : support (concerns: performance)

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• popover="hint"

  Limited availability

  The popover="hint" global HTML attribute creates a popover that is subordinate to popovers with a popover="auto" attribute. You can use this to create tooltips that don't dismiss auto popovers.

  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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌ Vendor position : unknown (concerns: privacy)
  • Safari on iOS ❌ Vendor position : unknown (concerns: privacy)

• 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 ❌ Vendor position : unknown
  • Firefox for Android ❌ Vendor position : unknown
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : unknown (concerns: security)
  • Firefox for Android ❌ Vendor position : unknown (concerns: security)
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : unknown
  • Firefox for Android ❌ Vendor position : unknown
  • Safari ❌ Vendor position : unknown
  • Safari on iOS ❌ Vendor position : unknown

• 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 ❌
  • Edge 104 Released on 2022-08-05
  • Firefox ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• Scroll markers

  Limited availability

  A scroll container can be navigated by activating ::scroll-marker pseudo-elements which appear in a generated ::scroll-marker-group pseudo-element, either before or after the scroll container.

  Learn more

  • Chrome 135 Released on 2025-04-01
  • Chrome Android ❌
  • Edge 135 Released on 2025-04-04
  • Firefox ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : unknown
  • Firefox for Android ❌ Vendor position : unknown
  • Safari ❌ Vendor position : unknown
  • Safari on iOS ❌ Vendor position : unknown

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• Web serial

  Limited availability

  The navigator.serial API communicates with devices over serial ports, such as microcontrollers.

  Learn more

  • Chrome 89 Released on 2021-03-02
  • Chrome Android ❌
  • Edge 89 Released on 2021-03-04
  • Firefox ❌ Vendor position : neutral
  • Firefox for Android ❌ Vendor position : neutral
  • Safari ❌ Vendor position : unknown
  • Safari on iOS ❌ Vendor position : unknown

• Shared storage

  Limited availability

  The sharedStorage API stores data to a shared space where the data can then be processed without the ability to track users across the different sites they visit. A common use case is measuring the reach of third-party ads without using user-tracking cookies."

  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 ❌ Vendor position : negative
  • Firefox for Android ❌ Vendor position : negative
  • Safari ❌ Vendor position : unknown
  • Safari on iOS ❌ Vendor position : unknown

• Shared storage locks

  Limited availability

  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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• sibling-count() and sibling-index()

  Limited availability

  The sibling-count() and sibling-index() CSS functions return integers that are useful to style elements based on their positions among siblings or on the number of siblings, for example as part of a calc() expression.

  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 ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari ❌ Vendor position : unknown
  • Safari on iOS ❌ Vendor position : unknown

• <img sizes="auto" loading="lazy">

  Limited availability

  The sizes="auto" attribute for the <img> HTML element sets the layout size for the image based on the computed layout size when choosing a source from the srcset. This attribute only applies to images with the loading="lazy" attribute.

  Learn more

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

• 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 ❌ Vendor position : neutral (concerns: complexity)
  • Firefox for Android ❌ Vendor position : neutral (concerns: complexity)
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : unknown
  • Firefox for Android ❌ Vendor position : unknown
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari ❌ Vendor position : unknown
  • Safari on iOS ❌ Vendor position : unknown

• 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 ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari ❌ Vendor position : unknown
  • Safari on iOS ❌ Vendor position : unknown

• 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 ❌
  • Edge ❌
  • Firefox ❌ Vendor position : negative
  • Firefox for Android ❌ Vendor position : negative
  • Safari ❌ Vendor position : unknown
  • Safari on iOS ❌ Vendor position : unknown

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : unknown
  • Firefox for Android ❌ Vendor position : unknown
  • Safari ❌
  • Safari on iOS ❌

• Topics

  Limited availability

  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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : neutral
  • Firefox for Android ❌ Vendor position : neutral
  • Safari ❌ Vendor position : blocked (concerns: interoperability, privacy)
  • Safari on iOS ❌ Vendor position : blocked (concerns: interoperability, privacy)

• 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 ❌ Vendor position : unknown
  • Firefox for Android ❌ Vendor position : unknown
  • Safari ❌ Vendor position : oppose (concerns: integration, use cases, portability, power, annoyance, device independence)
  • Safari on iOS ❌ Vendor position : oppose (concerns: integration, use cases, portability, power, annoyance, device independence)

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : unknown
  • Firefox for Android ❌ Vendor position : unknown
  • Safari ❌ Vendor position : unknown (concerns: device independence)
  • Safari on iOS ❌ Vendor position : unknown (concerns: device independence)

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌ Vendor position : oppose (concerns: privacy, device independence)
  • Safari on iOS ❌ Vendor position : oppose (concerns: privacy, device independence)

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• Relaxed-width SIMD (WebAssembly)

  Limited availability

  Relaxed SIMD (Single Instruction Multiple Data) introduces local non-determinism, where the results of the instructions may vary based on hardware support.

  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 ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari ❌ Vendor position : neutral
  • Safari on iOS ❌ Vendor position : neutral

• 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 ❌ Vendor position : negative
  • Firefox for Android ❌ Vendor position : negative
  • Safari ❌
  • Safari on iOS ❌

• Web NFC

  Limited availability

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

  Learn more

  • Chrome ❌
  • Chrome Android 100 Released on 2022-03-29
  • Edge ❌
  • Firefox ❌ Vendor position : negative
  • Firefox for Android ❌ Vendor position : negative
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Edge 89 Released on 2021-03-04
  • Firefox ❌ Vendor position : negative
  • Firefox for Android ❌ Vendor position : negative
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : negative
  • Firefox for Android ❌ Vendor position : negative
  • Safari ❌ Vendor position : oppose (concerns: privacy, security, device independence)
  • Safari on iOS ❌ Vendor position : oppose (concerns: privacy, security, device independence)

• 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 ❌ Vendor position : defer
  • Firefox for Android ❌ Vendor position : defer
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : defer
  • Firefox for Android ❌ Vendor position : defer
  • Safari ❌ Vendor position : oppose (concerns: privacy)
  • Safari on iOS ❌ Vendor position : oppose (concerns: privacy)

• 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 ❌ Vendor position : defer
  • Firefox for Android ❌ Vendor position : defer
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : positive
  • Firefox for Android ❌ Vendor position : positive
  • Safari ❌ Vendor position : unknown
  • Safari on iOS ❌ Vendor position : unknown

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Firefox ❌ Vendor position : defer
  • Firefox for Android ❌ Vendor position : defer
  • Safari ❌ Vendor position : support
  • Safari on iOS ❌ Vendor 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 ❌ Vendor position : defer
  • Firefox for Android ❌ Vendor position : defer
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Edge 105 Released on 2022-09-01
  • Firefox ❌ Vendor position : defer
  • Firefox for Android ❌ Vendor position : defer
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌
  • Edge 111 Released on 2023-03-13
  • Firefox ❌
  • Firefox for Android ❌
  • Safari ❌
  • Safari on iOS ❌

• 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 ❌ Vendor position : unknown
  • Firefox for Android ❌ Vendor position : unknown
  • Safari ❌
  • Safari on iOS ❌