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conformance · v150

v150 · responsively-sized-iframe — conformance probe

4 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://developer.mozilla.org/en-US/docs/Web/HTML/Element/iframe chromestatus: #5108373464547328 generated 2026-06-01T21:17:35Z by v150-conformance-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
iframe-allowresponsive-sizing-attribute-exists The allowResponsiveSizing IDL attribute is defined on HTMLIFrameElement. script
iframe-allowresponsive-sizing-type The allowResponsiveSizing property on an iframe is a boolean. script
iframe-allowresponsive-sizing-default-false The default value of allowResponsiveSizing on a new iframe is false. script
iframe-allowresponsive-sizing-reflection The allowResponsiveSizing IDL property reflects the content attribute correctly. script