Bug 306237

Summary: Style queries are buggy inside a `display: contents` container
Product: WebKit Reporter: Benoît Rouleau <benoit.rouleau>
Component: CSSAssignee: Nobody <webkit-unassigned>
Status: NEW    
Severity: Major CC: karlcow, koivisto, smh, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: Safari 26   
Hardware: All   
OS: All   
See Also: https://bugs.webkit.org/show_bug.cgi?id=301871
Attachments:
Description Flags
Reproduction of the bug none

Benoît Rouleau
Reported 2026-01-25 17:30:47 PST
Created attachment 478133 [details] Reproduction of the bug CSS container style queries behave super strangely when the container it is querying either has `display: contents` or is inside a `display: contents` wrapper. I am seeing all kinds of weirdness in a real project, but I managed to create a simple reproduction that hopefully allows you to find and fix the root cause for all of it. Check out the attached file. Thank you!
Attachments
Reproduction of the bug (713 bytes, text/html)
2026-01-25 17:30 PST, Benoît Rouleau 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Alexey Proskuryakov
Comment 1 2026-01-26 18:11:22 PST
Thank you for the report! Is this the same as bug 301871?
Benoît Rouleau
Comment 2 2026-01-27 06:04:05 PST
Ah, probably. Sorry for my bad searching skills!
Radar WebKit Bug Importer
Comment 3 2026-02-01 17:31:11 PST
<rdar://problem/169407119>
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