compositing/visibility/iframe-visibility-hidden.html Is a flakey failure that is happening on Big Sur Wk1 debug and release, Big Sur Arm64 Wk1 debug and release, and Catalina WK1 debug and release. History: https://results.webkit.org/?suite=layout-tests&test=compositing%2Fvisibility%2Fiframe-visibility-hidden.html Image Diff: https://build.webkit.org/results/Apple-BigSur-Release-WK1-Tests/r274301%20(948)/compositing/visibility/iframe-visibility-hidden-diff.png
Created attachment 422993 [details] Expected
Created attachment 422994 [details] Actual
Created attachment 422995 [details] Diff
<rdar://problem/75340005>
Able to bisect this failure to r274264. Able to reproduce on r274264 but unable to reproduce on r274263 or r274258, using this command: run-webkit-tests compositing/visibility/iframe-visibility-hidden.html --iterations 1000 -f -1
Updated test expectations: https://trac.webkit.org/changeset/274315/webkit
This change was all in media code, so a little surprising. But if it's indeed that, it has to be a substantial issue. I think.
Not really surprising; the test case uses video.
Test is a image failure, not a timeout; video is accurately firing the 'load' event. If the background isn't painting, that's not a video bug.
Created attachment 431412 [details] Patch test wip
Created attachment 431421 [details] Patch test wip #2
Created attachment 431523 [details] Patch test wip #3
Created attachment 431538 [details] Patch test wip #4