Bug 316382

Summary: MutationObserver.observe() incorrectly throws when attributeOldValue or characterDataOldValue is present with value false
Product: WebKit Reporter: Chris Dumez <cdumez>
Component: DOMAssignee: Chris Dumez <cdumez>
Status: RESOLVED FIXED    
Severity: Normal CC: webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
See Also: https://github.com/web-platform-tests/wpt/pull/60421

Chris Dumez
Reported 2026-06-04 23:24:36 PDT
MutationObserver.observe() incorrectly throws when attributeOldValue or characterDataOldValue is present with value false
Attachments
Chris Dumez
Comment 1 2026-06-04 23:26:34 PDT
Chris Dumez
Comment 2 2026-06-05 03:13:25 PDT
Submitted web-platform-tests pull request: https://github.com/web-platform-tests/wpt/pull/60421
EWS
Comment 3 2026-06-05 03:20:16 PDT
Committed 314623@main (a811f8d9e6ff): <https://commits.webkit.org/314623@main> Reviewed commits have been landed. Closing PR #66529 and removing active labels.
Radar WebKit Bug Importer
Comment 4 2026-06-05 03:21:13 PDT
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