Web platform features explorer

📃 April 2025 release notes

Newly available

The following features are newly available:

  • Atomics.pause(): The Atomics.pause() static method gives a hint to the CPU that the code calling the method is in a short-duration wait for shared memory, known as spinning or a spinlock.
  • Float16Array: Float16Array is a typed array of 16-bit floating point numbers.
  • JSON import attributes: Module import … with { type: "json" } statements load JSON data. Also known as JSON module scripts.
  • Single color stop gradients: A single color stop can be provided to the linear-gradient(), radial-gradient(), and conic-gradient() CSS functions, and their repeating counterparts, to create a solid color background.

Widely available

The following features are now widely available:

  • Grid animation: Grid animation allows you to animate the grid-template-columns and grid-template-rows CSS properties.
  • ic unit: The ic CSS length unit corresponds to the width of CJK ideographic characters.

New in Chrome

The following features are now available in Chrome:

  • Customizable <select>: The <select> element's appearance, including the button, selected option, picker dropdown, and options, can be customized using CSS.
  • fetchLater: 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.
  • Invoker commands: The command and commandfor attributes for the <button> HTML element dispatch an action to an element when the button is invoked (by click or keystroke), as a declarative alternative to addEventListener() calls or onclick attribute handlers.
  • Observable: 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.
  • print-color-adjust: The print-color-adjust CSS property sets whether styles of printed pages should be adjusted to use less ink, in cases such as light text on a dark background.
  • RegExp.escape(): The RegExp.escape() static method takes a string and replaces any characters that are potentially special characters of a regular expression with equivalent escape sequences. For example, RegExp.escape("[abc]") returns "\\[abc\\]".
  • Scroll markers: 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.

New in Chrome Android

The following features are now available in Chrome Android:

  • Customizable <select>: The <select> element's appearance, including the button, selected option, picker dropdown, and options, can be customized using CSS.
  • fetchLater: 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.
  • Invoker commands: The command and commandfor attributes for the <button> HTML element dispatch an action to an element when the button is invoked (by click or keystroke), as a declarative alternative to addEventListener() calls or onclick attribute handlers.
  • Observable: 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.
  • print-color-adjust: The print-color-adjust CSS property sets whether styles of printed pages should be adjusted to use less ink, in cases such as light text on a dark background.
  • RegExp.escape(): The RegExp.escape() static method takes a string and replaces any characters that are potentially special characters of a regular expression with equivalent escape sequences. For example, RegExp.escape("[abc]") returns "\\[abc\\]".

New in Edge

The following features are now available in Edge:

  • Customizable <select>: The <select> element's appearance, including the button, selected option, picker dropdown, and options, can be customized using CSS.
  • fetchLater: 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.
  • Invoker commands: The command and commandfor attributes for the <button> HTML element dispatch an action to an element when the button is invoked (by click or keystroke), as a declarative alternative to addEventListener() calls or onclick attribute handlers.
  • Observable: 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.
  • Scroll markers: 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.

New in Firefox

The following features are now available in Firefox:

  • Hyphenate limit chars: The hyphenate-limit-chars CSS property sets the number of characters in a word before it is hyphenated and the minimum number of characters on either side of the hyphen.
  • Error.isError(): The Error.isError() static method checks whether a value is an Error object.
  • Math.sumPrecise(): The Math.sumPrecise() static method returns the sum of an iterable of numbers. It avoids the precision loss of intermediate partial sums, as found using reduce() or a loop to add together an array of values.

New in Firefox for Android

The following features are now available in Firefox for Android:

  • Hyphenate limit chars: The hyphenate-limit-chars CSS property sets the number of characters in a word before it is hyphenated and the minimum number of characters on either side of the hyphen.
  • Error.isError(): The Error.isError() static method checks whether a value is an Error object.
  • Math.sumPrecise(): The Math.sumPrecise() static method returns the sum of an iterable of numbers. It avoids the precision loss of intermediate partial sums, as found using reduce() or a loop to add together an array of values.