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conformance · v142

v142 · activeviewtransition-property-on-document — 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-view-transitions-2/ chromestatus: #5067126381215744 generated 2026-06-01T08:13:10Z by conformance-author-v1-subagent
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id contract kind verdict detail
active-view-transition-property-exists Document exposes an activeViewTransition IDL attribute. spec ↗ script
active-view-transition-null-by-default document.activeViewTransition is null when no transition is in flight. script
start-view-transition-still-available document.startViewTransition remains the way to begin an SPA transition. spec ↗ typeof
view-transition-interface-exists The ViewTransition interface is exposed so the activeViewTransition return value has a usable type. exists
active-view-transition-reflects-running-transition Calling document.startViewTransition sets document.activeViewTransition to the returned transition for the duration of the transition. spec ↗ script
active-view-transition-clears-after-finished Once the transition's finished promise settles, document.activeViewTransition returns to null. script