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conformance · v133

v133 · expose-coarsened-cross-origin-rendertime-in-elment-timing-lcp-regardless-of-tao — 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://w3c.github.io/paint-timing/#mark-paint-timing chromestatus: #5128261284397056 generated 2026-06-01T08:12:59Z by conformance-author-v1-subagent
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pass
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fail
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blocked
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id contract kind verdict detail
performance-observer-exposed PerformanceObserver is exposed. exists
element-timing-supported PerformanceObserver.supportedEntryTypes includes 'element' for element-timing. script
lcp-supported PerformanceObserver.supportedEntryTypes includes 'largest-contentful-paint'. script
performance-element-timing-rendertime-attr PerformanceElementTiming.prototype exposes the renderTime attribute (coarsened cross-origin value reported here regardless of TAO). spec ↗ script
largest-contentful-paint-rendertime-attr LargestContentfulPaint.prototype exposes a renderTime attribute. spec ↗ script