Bug 313768

Summary:

REGRESSION(312300@main): [macOS] TestWebKitAPI.UnifiedPDF.EmbeddedPDFScrollbarDoesNotAdaptToDarkMode is flaky failure

Product:

WebKit

Reporter:

Marta Darbinyan <darbinyan>

Component:

New Bugs

Assignee:

alan <zalan>

Status:

RESOLVED FIXED

Severity:

Normal

CC:

a_protyasha, ap, webkit-bot-watchers-bugzilla, webkit-bug-importer, zalan

Priority:

Keywords:

InRadar

Version:

WebKit Nightly Build

Hardware:

Unspecified

OS:

Unspecified

Attachments:

Description	Flags
[fast-cq]Patch	none

Marta Darbinyan

Reported 2026-04-30 11:56:46 PDT

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

Attachments
[fast-cq]Patch (5.25 KB, patch) 2026-04-30 14:12 PDT, alan	no flags	Details Formatted Diff Diff
View All Add attachment proposed patch, testcase, etc.

Radar WebKit Bug Importer

Comment 1 2026-04-30 11:57:05 PDT

<rdar://problem/175961655>

EWS

Comment 2 2026-04-30 12:17:08 PDT

Test gardening commit 312382@main (c50465b64fde): <https://commits.webkit.org/312382@main> Reviewed commits have been landed. Closing PR #63989 and removing active labels.

alan

Comment 3 2026-04-30 14:12:45 PDT

Created attachment 479402 [details] [fast-cq]Patch

Abrar Rahman Protyasha

Comment 4 2026-04-30 14:20:16 PDT

Comment on attachment 479402 [details] [fast-cq]Patch Yup, I'd considered making the full frame vs embedded plugin behavior more obvious, but thank you for discovering it regardless.

alan

Comment 5 2026-04-30 14:21:45 PDT

Thank you for reviewing it!

EWS

Comment 6 2026-04-30 19:45:43 PDT

Committed 312409@main (8f6ed05e251a): <https://commits.webkit.org/312409@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 479402 [details].

Alexey Proskuryakov

Comment 7 2026-05-02 12:16:05 PDT

What was making this failure flaky? Is there some state leaking between tests?

alan

Comment 8 2026-05-02 12:32:53 PDT

I didn't look as it was 100% repro locally (e.g. iteration=20 came back with 20 failures, single run always failed).

Alexey Proskuryakov

Comment 9 2026-05-02 13:24:28 PDT

The history is flaky on all queues.

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