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conformance · v139

v139 · full-frame-rate-render-blocking-attribute — 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.

browser: spec: https://html.spec.whatwg.org/multipage/urls-and-fetching.html#blocking-attributes chromestatus: #5207202081800192 generated 2026-06-01T08:13:31Z 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
link-element-exposes-blocking HTMLLinkElement reflects the blocking attribute as element.blocking (a DOMTokenList per the HTML spec). spec ↗ script
script-element-exposes-blocking HTMLScriptElement also reflects the blocking attribute. script
style-element-exposes-blocking HTMLStyleElement reflects the blocking attribute. script
blocking-token-render-still-works Existing 'render' token in blocking remains supported — full-frame-rate is additive. script
blocking-token-full-frame-rate Setting blocking='full-frame-rate' on a link element is accepted and reflected back via the IDL DOMTokenList (the new token added by this feature). spec ↗ script
dom-token-list-supports-on-blocking element.blocking exposes a DOMTokenList — supports() can be queried (browsers that recognise the token return true). script