Bug 303341 – [iOS] imported/w3c/web-platform-tests/css/css-contain/content-visibility/content-visibility-intrinsic-size-001.html is flaky failure with image diff

• Component: New Bugs
• Status: NEW

[Marta Darbinyan]

The following test is a flaky image failure on iOS26 and flaky test in EWS.

imported/w3c/web-platform-tests/css/css-contain/content-visibility/content-visibility-intrinsic-size-001.html 

Test result:
https://ews-build.s3-us-west-2.amazonaws.com/iOS-26-Simulator-WPT-WK2-Tests-EWS/64f146cf-4378-rerun/results.html

Test history:
https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fcss%2Fcss-contain%2Fcontent-visibility%2Fcontent-visibility-intrinsic-size-001.html&platform=ios

[Radar WebKit Bug Importer]

<rdar://problem/165644883>

[EWS]

Test gardening commit 303719@main (1aa6a4357672): <https://commits.webkit.org/303719@main>

Reviewed commits have been landed. Closing PR #54666 and removing active labels.

[Karl Dubost]

The test was imported on Jul 28, 2024.

[Karl Dubost]

https://wpt.live/css/css-contain/content-visibility/content-visibility-intrinsic-size-001.html
https://wpt.fyi/css/css-contain/content-visibility/content-visibility-intrinsic-size-001.html

I do not see the test being flaky on WPT when checking the history.
https://wpt.fyi/results/css/css-contain/content-visibility/content-visibility-intrinsic-size-001.html?label=experimental&label=master&aligned

[Karl Dubost]

On the issue seems to be that the rendering is totally white. Did it take too long to render?
https://ews-build.s3-us-west-2.amazonaws.com/iOS-26-Simulator-WPT-WK2-Tests-EWS/64f146cf-4378-rerun/imported/w3c/web-platform-tests/css/css-contain/content-visibility/content-visibility-intrinsic-size-001-diffs.html

Tim, do you know what could create the rendering issue on iOS?

[Karl Dubost]

Created attachment 477576 [details]
rendering on iOS

on iOS when loading the live test I can see weird artifacts.