Bug 264527

Summary:	REGRESSION (270319@main): [Ventura+ iOS17 ]imported/w3c/web-platform-tests/css/css-cascade/idlharness.html is a flaky failure
Product:	WebKit	Reporter:	Marta Darbinyan <darbinyan>
Component:	New Bugs	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	webkit-bot-watchers-bugzilla, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Marta Darbinyan 2023-11-09 15:33:25 PST

Description:
imported/w3c/web-platform-tests/css/css-cascade/idlharness.html is a flaky on macOS Monterey, Sonoma and iOS17 ToT since 270319@main introduced.

This issue can be reproduced by using the command: 
run-webkit-tests --release --iterations=50 imported/w3c/web-platform-tests/css/css-cascade/idlharness.html

History:
https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fcss%2Fcss-cascade%2Fidlharness.html&architecture=arm64

Diff Log:
FAIL idl_test setup promise_test: Unhandled rejection with value: object "Error fetching /interfaces/css-cascade.idl."
FAIL idl_test setup promise_test: Unhandled rejection with value: object "Error fetching /interfaces/css-cascade-6.idl."

Link:
https://build.webkit.org/results/Apple-Sonoma-Release-AppleSilicon-WK2-Tests/270445@main%20(724)/imported/w3c/web-platform-tests/css/css-cascade/idlharness-pretty-diff.html

Comment 1 Radar WebKit Bug Importer 2023-11-09 15:33:59 PST

<rdar://problem/118203546>

Comment 2 EWS 2023-11-09 15:48:39 PST

Test gardening commit 270485@main (cd98c8bfca4c): <https://commits.webkit.org/270485@main>

Reviewed commits have been landed. Closing PR #20267 and removing active labels.