The AbortSignal.timeout() static method returns an abort signal that automatically aborts after a specified duration.

The align-content property vertically aligns content in block layouts, like it does in flex or grid layouts.

The transform-box CSS property sets the position and dimensions of the reference box relative to which an element's transformations are calculated.

The Intl.Segmenter API creates a locale-aware text splitter that can separate a string into meaningful graphemes, words, or sentences.

The paint-order CSS property sets the z-order of strokes, fills, and (in SVG content) markers. For example, paint-order: markers stroke fill; draws the markers, then stroke on top of markers, then fill on top of both markers and stroke.

The white-space-collapse CSS property sets whether new line characters are shown as line breaks, and whether multiple consecutive spaces are all displayed or combined.

The AbortSignal.any() static method combines an iterable of abort signals into a single signal, with the abort reason taken from the first signal to abort.

The i32.add, i32.sub, i32.mul, i64.add, i64.sub, and i64.mul operations extend constant expressions to include arithmetic.

The Promise.withResolvers() static method is an alternative to the Promise() constructor that returns both the promise and resolution functions. You can use this to access resolve and reject outside the scope of the executor function.

The checkVisibility() method checks if an element is potentially visible, with optional parameters for the kinds of visibility to check. For example, it checks whether the element has the style display: none, but can also check for visibility: hidden.

The transfer() and transferToFixedLength() methods of ArrayBuffer move a buffer from one context to another (for example, to a worker).

The Object.groupBy() and Map.groupBy() static methods group values of arrays and iterables based on a function that returns a key for each value.

The shadowrootmode attribute on <template> creates a shadow root without the use of JavaScript. It is a declarative alternative to the attachShadow() method.

AVIF (AV1 Image File Format) is an image format based on the AV1 video format.

The Array.fromAsync() static method copies items from an async iterable object to make a new array.

The rect() CSS function creates a rectangle shape with insets from the edges of an element. The xywh() CSS function creates a rectangle shifted by an x and y distance. They can be used with clip-path and shape-outside.