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conformance · v148

v148 · user-action-pseudo-class-top-layer-boundary — conformance probe

5 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/selectors-4/#useraction-pseudos chromestatus: #4737629907058688 generated 2026-06-01T08:14:38Z by conformance-author-v1-subagent
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id contract kind verdict detail
hover-selector-supported :hover is one of the user-action pseudo-classes affected by the top-layer boundary rule. css-supports
focus-selector-supported :focus pseudo-class is supported. css-supports
active-selector-supported :active pseudo-class is supported. css-supports
dialog-show-modal <dialog>.showModal places the dialog in the top layer (the layer this rule scopes against). spec ↗ script
popover-attribute-reflects popover attribute (another way to enter the top layer) is reflected on HTMLElement. script