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CSS Grid Lanes: CSS Grid Lanes extends CSS Grid to create layouts with columns or rows (not both), allowing mixed aspect ratio content to pack neatly (also known as "masonry" or "waterfall" layout).

Today's site update adds a number of new features: Web-features browser support tables In addition to the existing caniuse and MDN BCD support tables, features from the web-features project will now appear in search results and elsewhere on the site. Each web-feature table includes the support included from the major browsers tracked as well as derived support for other browsers where available. Each table also includes a link to the list of all BCD sub-features that the feature's support is based on. Web-features that have a caniuse equivalent are currently hidden to prevent duplicate information (similar to how BCD features are handled). Note that currently there are still a few places where only the original caniuse features are listed or considered (for example the comparison tool), these will be updated to include web-features in the future. New feature list UI and improved filteri

CSS if() function: The if() CSS function allows different values to be set for a property depending on the result of a conditional test. The test can be based on a style query, a media query, or a feature query.

View Transitions (cross-document): Provides a mechanism for easily creating animated transitions between different DOM states, while also updating the DOM contents in a single step. This API is specific to cross-document transitions.

- WebAssembly BigInt to i64 conversion in JS API: An extension to the WebAssembly JS API for bidrectionally converting BigInts and 64-bit WebAssembly integer values - WebAssembly Bulk Memory Operations: An extension to WebAssembly adding bulk memory operations and conditional segment initialization - WebAssembly Multi-Value: An extension to WebAssembly allowing instructions, blocks and functions to produce multiple result values - WebAssembly Import/Export of Mutable Globals: An extension to WebAssembly import and export of mutable global variables - WebAssembly Non-trapping float-to-int Conversion: An extension to WebAssembly adding floating-point to integer conversion operators which saturate instead of trapping - WebAssembly Sign Extension O

- WebAssembly Reference Types: An extension to WebAssembly allowing opaque references as first-class types, and multiple tables - CSS Anchor Positioning: Allows placing elements anywhere on the page relative to an "anchor element", without regard to the layout of other elements besides their containing block