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conformance · v135

v135 · deprecate-mutation-events — conformance probe

5 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://w3c.github.io/uievents/ chromestatus: #5083947249172480 generated 2026-06-01T09:10:00Z by conformance-author-v1-subagent
0
pass
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fail
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blocked
5
total
id contract kind verdict detail
mutation-observer-still-exists MutationObserver — the recommended replacement — is exposed. spec ↗ typeof
domnodeinserted-listener-still-allowed Deprecation does not remove DOMNodeInserted yet — listener registration is still accepted. spec ↗ script
mutation-event-interface-exists MutationEvent interface is still exposed on the global during the deprecation window. spec ↗ script
mutationobserver-observe-mechanism MutationObserver.observe accepts a target + options — the migration target. spec ↗ script
domnodeinsertedintodocument-still-allowed DOMNodeInsertedIntoDocument is still listenable (deprecated, not removed). spec ↗ script