media/track/track-cue-css.html is a flakey image failure in macOS Catalina+ in release and debug, on wk1 an wk2, one Intel and Apple Silicon Macs. HISTORY URL: https://results.webkit.org/?suite=layout-tests&test=media%2Ftrack%2Ftrack-cue-css.html&platform=mac Image Diffs have been attached to this bug.
Created attachment 423507 [details] Image DIFFS Attaching image diffs to bug.
<rdar://problem/75535441>
I was able to reproduce the failure at BigSur Debug ToT using the following test: run-webkit-test media/track/track-cue-css.html --iterations 1000 --child-process=1 I could not track down a regression point, as it appears this test has been a flakey image failure for a while. But it is reproducible at ToT at least.
I have updated the test expectations to Pass ImageOnlyFailure to deal with the flakiness of this test while it is being reviewed: https://trac.webkit.org/changeset/274595/webkit
It looks like the "actual" results are correct, and the "expected" results incorrect.