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conformance · v145

v145 · add-presentationtime-painttime-to-performance-entries — conformance probe

7 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://w3c.github.io/paint-timing/#painttimingmixin chromestatus: #5162859838046208 generated 2026-06-01T08:14:32Z by conformance-author-v1-subagent
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id contract kind verdict detail
performance-observer-exists PerformanceObserver is available, the entry point for reading paint/element/LCP timing entries. exists
paint-timing-supported-entry-type The 'paint' entry type is reported by PerformanceObserver.supportedEntryTypes. spec ↗ script
largest-contentful-paint-supported 'largest-contentful-paint' entry type is supported — paintTime/presentationTime are added to entries of this type. spec ↗ script
element-timing-supported 'element' entry type is supported — paintTime/presentationTime are added to element-timing entries too. spec ↗ script
long-animation-frame-supported 'long-animation-frame' entry type is supported — paintTime/presentationTime are added to LoAF entries. spec ↗ script
paint-timing-mixin-paint-time PerformancePaintTiming.prototype exposes a paintTime accessor for paint entries. spec ↗ script
paint-timing-mixin-presentation-time PerformancePaintTiming.prototype exposes a presentationTime accessor for paint entries. spec ↗ script