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shape(): The shape() CSS function creates shapes with a series of commands like line, move, and curve. It can be used with clip-path and shape-outside.
Trusted types: Trusted types allow you to lock down insecure parts of the DOM API and prevent client-side cross-site scripting (XSS) attacks.
Map getOrInsert(): The getOrInsert() and getOrInsertComputed() methods of Map objects get a value, setting and getting a default value if needed.
Zstandard compression: Zstandard or zstd is a fast lossless compression algorithm. When used as a content encoding, it is often faster and offers better compression than brotli.
Active view transition: The :active-view-transition CSS pseudo-class matches the root element when a view transition is active. The :active-view-transition-type() CSS pseudo-class matches only when the active view transition was started with the specified type.

dirname: The dirname attribute of <textarea> and <input> HTML elements includes the field's writing direction as form data on submission.
Two-value display property: The display CSS property accepts multiple keyword values, such as inline flex or block flow, to explicitly set an element's inner and outer layout mode. Also known as 2-value, multi-keyword, or multiple value syntax.
animation-composition: The animation-composition CSS property chooses how to combine animations that affect the same property.
Array by copy: The toReversed(), toSorted(), toSpliced(), and with() methods of arrays and typed arrays return changed copies of arrays. They stand in contrast to methods such as sort() or reverse() that change arrays in place.
calc() keywords: The e, pi, infinity, and NaN keywords represent well-defined constants accepted in CSS math functions such as calc().