demo · v146
Named feature catalog
The CSSWG is building a registry of feature names — short identifiers a page can ask about with @supports named-feature(…). This catalog runs each known token through CSS.supports() in your browser right now, scores it yes/no, and lets you filter by category.
The point of named-feature is to ask the browser about capabilities that aren't expressible as a single property-value pair: parser quirks, behavioural fixes, observed-but-unspec'd APIs, vendor-coordinated bugs. This page tests each candidate name against CSS.supports("named-feature(x)") and reports the live answer.
0tokens tested
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How the test runs
// for every catalog token:
const ok = CSS.supports(`named-feature(${name})`);
// the function returns false in browsers that don't recognise named-feature() at all,
// so on a non-146 build every row reads NO — which is a useful signal in itself.