313768 2026-04-30 11:56:46 -0700 REGRESSION(312300@main): [macOS] TestWebKitAPI.UnifiedPDF.EmbeddedPDFScrollbarDoesNotAdaptToDarkMode is flaky failure 2026-05-02 13:24:28 -0700 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 darbinyan zalan a_protyasha ap webkit-bot-watchers-bugzilla webkit-bug-importer zalan oldest_to_newest 2206339 0 darbinyan 2026-04-30 11:56:46 -0700 The following test is flaky failure on macOS after 312300@main. TestWebKitAPI.UnifiedPDF.EmbeddedPDFScrollbarDoesNotAdaptToDarkMode 09:55:13.468 1029 TestWebKitAPI.UnifiedPDF.EmbeddedPDFScrollbarDoesNotAdaptToDarkMode 09:55:13.468 1029 CoreGraphics PDF has logged an error. Set environment variable "CG_PDF_VERBOSE" to learn more. 09:55:13.468 1029 09:55:13.468 1029 /Volumes/Data/worker/macOS-Tahoe-Debug-Build-EWS/build/Tools/TestWebKitAPI/Tests/WebKit/WKWebView/UnifiedPDFTests.mm:1523 09:55:13.468 1029 Value of: [pluginNode containsString:@"uses dark appearance for scrollbars"] 09:55:13.468 1029 Actual: true 09:55:13.468 1029 Expected: false Test link: https://ews-build.webkit.org/#/builders/165/builds/23462 History: https://results.webkit.org/?suite=api-tests&test=TestWebKitAPI.UnifiedPDF.EmbeddedPDFScrollbarDoesNotAdaptToDarkMode 2206340 1 webkit-bug-importer 2026-04-30 11:57:05 -0700 <rdar://problem/175961655> 2206343 2 ews-feeder 2026-04-30 12:17:08 -0700 Test gardening commit 312382@main (c50465b64fde): <https://commits.webkit.org/312382@main> Reviewed commits have been landed. Closing PR #63989 and removing active labels. 2206370 3 479402 zalan 2026-04-30 14:12:45 -0700 Created attachment 479402 [fast-cq]Patch 2206372 4 479402 a_protyasha 2026-04-30 14:20:16 -0700 Comment on attachment 479402 [fast-cq]Patch Yup, I'd considered making the full frame vs embedded plugin behavior more obvious, but thank you for discovering it regardless. 2206374 5 zalan 2026-04-30 14:21:45 -0700 Thank you for reviewing it! 2206465 6 ews-feeder 2026-04-30 19:45:43 -0700 Committed 312409@main (8f6ed05e251a): <https://commits.webkit.org/312409@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 479402. 2206913 7 ap 2026-05-02 12:16:05 -0700 What was making this failure flaky? Is there some state leaking between tests? 2206917 8 zalan 2026-05-02 12:32:53 -0700 I didn't look as it was 100% repro locally (e.g. iteration=20 came back with 20 failures, single run always failed). 2206922 9 ap 2026-05-02 13:24:28 -0700 The history is flaky on all queues. 479402 2026-04-30 14:12:45 -0700 2026-04-30 19:45:44 -0700 [fast-cq]Patch bug-313768-20260430141245.patch text/plain 5380 zalan RnJvbSAzNWVlNTllNjFkOGU3MjdiMzVmNWE2NmI5MjcxZjI1ODA3ZmUyODhmIE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBBbGFuIEJhcmFkbGF5IDx6YWxhbkBhcHBsZS5jb20+CkRhdGU6 IFRodSwgMzAgQXByIDIwMjYgMTM6MDg6MjMgLTA3MDAKU3ViamVjdDogW1BBVENIXSBSRUdSRVNT SU9OKDMxMjMwMEBtYWluKTogW21hY09TXQogVGVzdFdlYktpdEFQSS5VbmlmaWVkUERGLkVtYmVk ZGVkUERGU2Nyb2xsYmFyRG9lc05vdEFkYXB0VG9EYXJrTW9kZSBpcyBmbGFreQogZmFpbHVyZSBo dHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MzEzNzY4CiA8cmRhcjovL3By b2JsZW0vMTc1OTYxNjU1PgoKUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCgpSZXN0b3JlIHBy 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