NEW296803
Container style queries are either not applied or canceled (e.g., on user interactions) on custom elements in shadow DOM of other custom elements 
https://bugs.webkit.org/show_bug.cgi?id=296803
Summary Container style queries are either not applied or canceled (e.g., on user int...
Dmitry Sharabin
Reported 2025-08-01 05:23:12 PDT
Created attachment 476248 [details] Screenshot of the testcase state before user interaction See this reduced testcase on Codepen: https://codepen.io/dmitrysharabin/pen/ByoWawb The bug can also be observed in Safari Technology Preview Release 224 (WebKit 20622.1.20.1)
Attachments
Screenshot of the testcase state before user interaction (61.79 KB, image/png)
2025-08-01 05:23 PDT, Dmitry Sharabin 		no flags
Details
Screenshot of the testcase state after user interaction (60.34 KB, image/png)
2025-08-01 05:24 PDT, Dmitry Sharabin 		no flags
Details
rendering in safari, firefox, chrome (291.05 KB, image/png)
2025-08-04 21:30 PDT, Karl Dubost 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Dmitry Sharabin
Comment 1 2025-08-01 05:24:39 PDT
Created attachment 476249 [details] Screenshot of the testcase state after user interaction
Karl Dubost
Comment 2 2025-08-04 21:30:16 PDT
Created attachment 476282 [details] rendering in safari, firefox, chrome * This is passing only in Chrome. * Firefox has both red * Safari has red on the first one after interaction.
Karl Dubost
Comment 3 2025-08-04 21:31:11 PDT
Tested on Safari Technology Preview 26.0 (224) 20622.1.20.1 Firefox Nightly 143.0a1 14325.7.28 Google Chrome Canary 140.0.7331.0 7331.0
Radar WebKit Bug Importer
Comment 4 2025-08-08 05:24:14 PDT
<rdar://problem/157838763>
Woody Lee
Comment 5 2025-10-14 22:48:20 PDT
Tested on Mac OS Safari 26, and it works well. But reproduces on IOS Safari 26.
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