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conformance · v132
v132 · resource-timing-revert-responsestart-change-and-introduce-firstresponseheadersst — 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.
0
pass
0
fail
0
blocked
6
total
| id | contract | kind | verdict | detail |
|---|---|---|---|---|
performance-resource-timing-class |
PerformanceResourceTiming is exposed. | exists | … | |
response-start-property-exists |
PerformanceResourceTiming.prototype.responseStart is exposed. spec ↗ | script | … | |
first-response-headers-start-property |
PerformanceResourceTiming.prototype.firstResponseHeadersStart is exposed — the new timestamp. spec ↗ | script | … | |
final-response-headers-start-property |
PerformanceResourceTiming.prototype.finalResponseHeadersStart is exposed — paired with firstResponseHeadersStart for early-hints visibility. spec ↗ | script | … | |
supported-entry-types-include-resource |
'resource' is an advertised supported entry type. | script | … | |
response-start-is-number |
responseStart on resource entries reads as a number (DOMHighResTimeStamp). spec ↗ | script | … |