📃 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.
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.

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.

The following features are now available in Chrome:

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.

The following features are now available in Chrome Android:

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\\]".

The following features are now available in Edge:

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.

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.

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.