📃 November 2025 release notes

Widely available

The following features are now widely available:

• 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.
• Lab and LCH: The CIE Lab color space expresses colors in terms of lightness and how red/green and blue/yellow a color is. LCH is a variant of Lab with polar coordinates. These color spaces can be used with the CSS color(), lab(), and lch() functions. Also known as CIELAB and CIELCH.
• :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.
• WebRTC SCTP information: The sctp object on RTCPeerConnection represents the negotiated SCTP transport. SCTP (Stream Control Transmission Protocol) is the protocol that RTCDataChannel uses.