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conformance · v142

v142 · non-tree-scoped-container-name-matching — conformance probe

6 assertions drawn from the spec. Each is a single contract the spec text makes. Pass/fail reflects what this browser executed; blocked means the contract was not run because it needs user mediation, hardware, or another unavailable precondition. Open the page in Chrome stable / canary / Firefox / Safari to compare.

browser: spec: https://drafts.csswg.org/css-conditional-5/#container-name chromestatus: #5194034339512320 generated 2026-06-01T08:13:10Z by conformance-author-v1-subagent
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id contract kind verdict detail
container-name-supported container-name is a registered property; the change is in matching semantics, not in parsing. css-supports
container-type-supported container-type accepts the inline-size keyword. css-supports
container-shorthand-supported The `container` shorthand accepts name/type — the surface a shadow-tree stylesheet uses to declare a container. css-supports
container-query-rule-parses Userland can author an @container rule referencing a named container; CSSContainerRule is exposed as the OM surface. exists
attach-shadow-supported attachShadow is available so the cross-tree-scope container-name matching can actually be exercised. script
cross-shadow-named-container-match A container declared inside a shadow tree, queried by name from a light-tree stylesheet, now matches and resolves the inline-size query. spec ↗ script