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conformance · v139

v139 · continue-running-transitions-when-switching-to-initial-transition-value — 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://www.w3.org/TR/css-transitions-1/#starting chromestatus: #5194501932711936 generated 2026-06-01T08:13:31Z by conformance-author-v1-subagent
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id contract kind verdict detail
transition-property-supported CSS transition-property is supported as a longhand for declaring which properties transition. spec ↗ css-supports
transition-shorthand-supported The transition shorthand still accepts value/duration/easing/delay in one declaration. spec ↗ css-supports
getanimations-on-element Element.prototype.getAnimations is exposed; running transitions appear there and are inspected for the continuation behaviour. spec ↗ typeof
transition-event-constructor TransitionEvent is exposed; transitions that continue after a transition-property change still dispatch transitionend. exists
transition-continues-after-property-reset A running transition is not cancelled when transition-property is reset, provided the animated property itself has not changed. spec ↗ script
transition-stays-with-document-timeline document.timeline is exposed; transitions ride this timeline and the v139 behaviour change does not alter timeline identity. typeof