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conformance · v148

v148 · deprecate-and-remove-non-allowlisted-event-interfaces-from-document-createevent — 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://dom.spec.whatwg.org/#dom-document-createevent chromestatus: #5681920596901888 generated 2026-06-01T08:14:38Z by conformance-author-v1-subagent
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fail
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id contract kind verdict detail
create-event-still-works-for-allowlisted document.createEvent('Event') remains supported for the spec allowlist. script
create-event-customevent-works document.createEvent('CustomEvent') is in the allowlist and continues to work. script
create-event-mouseevent-works document.createEvent('MouseEvent') is in the allowlist and continues to work. script
create-event-htmlevents-removed document.createEvent('HTMLEvents') is no longer in the allowlist and must throw. spec ↗ throws
create-event-bogus-throws An unrecognised event interface throws a NotSupportedError DOMException. spec ↗ script