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conformance · v145
v145 · use-of-csspixels-in-layoutshift-api — 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.
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pass
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fail
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blocked
6
total
| id | contract | kind | verdict | detail |
|---|---|---|---|---|
layout-shift-interface-exists |
LayoutShift is exposed — the entry type whose attribution coordinates change units. | exists | … | |
layout-shift-supported-entry-type |
PerformanceObserver.supportedEntryTypes lists 'layout-shift'. spec ↗ | script | … | |
layout-shift-attribution-exists |
LayoutShiftAttribution is exposed — the per-source detail containing prevRect/currentRect. | exists | … | |
layout-shift-attribution-prev-rect |
LayoutShiftAttribution.prototype exposes a prevRect — the rectangle now reported in CSS pixels. spec ↗ | script | … | |
layout-shift-attribution-current-rect |
LayoutShiftAttribution.prototype exposes a currentRect — the second rectangle now in CSS pixels. spec ↗ | script | … | |
device-pixel-ratio-exposed |
window.devicePixelRatio is exposed — useful for verifying the unit change vs physical pixels in dev tools. | typeof | … |