← back to v148 · container-timing
conformance · v148
v148 · container-timing — 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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| id | contract | kind | verdict | detail |
|---|---|---|---|---|
performance-observer-exists |
PerformanceObserver is the delivery mechanism used when Container Timing is enabled. spec ↗ | exists | … | |
containertiming-attribute-reflects |
The containertiming content attribute stores the identifier that becomes PerformanceContainerTiming.identifier. spec ↗ | script | … | |
containertiming-ignore-attribute-reflects |
The containertiming-ignore content attribute can mark an ignored subtree for ancestor container timing. spec ↗ | script | … | |
performance-container-timing-constructor-gates-native-support |
Origin-trial native support is detected through the PerformanceContainerTiming constructor recommended by Chrome. spec ↗ | script | … | |
performance-container-timing-prototype-fields |
When native support is enabled, PerformanceContainerTiming exposes the identifier, first-render, size, root, last-painted, and paint timestamp fields. spec ↗ | script | … | |
native-observer-registration-or-clean-unsupported |
When native support is enabled, PerformanceObserver can register type: 'container'; otherwise the unsupported browser path remains clean. spec ↗ | script | … |