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Use the Web platform features explorer to discover new features and APIs and stay up-to-date with changes.

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Atomics.waitAsync: The Atomics.waitAsync() static method waits for a value in a shared memory location, providing a promise when the expected value is not yet in memory. The waitAsync() method is a non-blocking alternative to Atomics.wait().
view-transition-class: The view-transition-class CSS property sets a name that can be used to apply styles to multiple named view transition pseudo-elements.
View transitions: View transitions allow you to create animated visual transitions between different states of a document.
WebRTC encoded transform: The WebRTC encoded transform API allows you to modify audio and video streams in WebRTC connections. For example, it can be used for visual effects or custom codecs.
::details-content: The ::details-content pseudo-element selects the expandable content of a <details> element, excluding the <summary>.

color(): The color() function picks a color from a given color space. Wide gamut color spaces like display-p3 allow showing more vibrant and saturated colors than the standard srgb color space.
color-mix(): The color-mix() function mixes two colors in a given color space and by a given amount. Commonly, lighter or darker variations of a color are created by mixing with white or black.
Compression streams: The CompressionStream and DecompressionStream APIs compress and decompress data using the gzip or deflate formats.
:nth-child() of <selector>: The of syntax for the :nth-child() and :nth-last-child() CSS functional pseudo-classes match elements by the relative position of elements, counted from the first or last sibling matching a selector list.
Oklab and Oklch: The Oklab color space expresses colors in terms of lightness and how red/green and blue/yellow a color is, aiming to match how humans perceive colors. Oklch is a variant of Oklab with polar coordinates. These color spaces can be used with the CSS color(), oklab(), and oklch() functions.