Bug 313953

Summary: MessageChannel transfer of OffscreenCanvas and other non-IPC-serializable types fails with Site Isolation enabled
Product: WebKit Reporter: Cameron McCormack (:heycam) <heycam>
Component: WebKit Process ModelAssignee: Cameron McCormack (:heycam) <heycam>
Status: RESOLVED FIXED    
Severity: Normal CC: nham, 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/59772

Cameron McCormack (:heycam)
Reported 2026-05-04 00:24:07 PDT
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Attachments
Radar WebKit Bug Importer
Comment 1 2026-05-04 00:27:02 PDT
Cameron McCormack (:heycam)
Comment 2 2026-05-04 00:30:39 PDT
Cameron McCormack (:heycam)
Comment 3 2026-05-04 22:09:50 PDT
Anthony is fixing the same bug in https://bugs.webkit.org/show_bug.cgi?id=313692. I'll repurpose this bug to add my new tests.
EWS
Comment 4 2026-05-09 16:44:39 PDT
Committed 312959@main (0650787ae153): <https://commits.webkit.org/312959@main> Reviewed commits have been landed. Closing PR #64155 and removing active labels.
Cameron McCormack (:heycam)
Comment 5 2026-05-09 16:55:40 PDT
Submitted web-platform-tests pull request: https://github.com/web-platform-tests/wpt/pull/59772
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