Description: transforms/2d/scale-change-composited.html This issue does not happen on post-commit bots and the failure only presents on ews. The first failure that I see on ews was 10/15/20 test transforms/2d/scale-change-composited.html failed on clean tree run in https://ews-build.webkit.org/#/builders/10/builds/39011. EWS History: https://ews-build.webkit.org/#/builders/10/builds/39011 https://ews-build.webkit.org/#/builders/10/builds/39013 https://ews-build.webkit.org/#/builders/10/builds/39012 https://ews-build.webkit.org/#/builders/10/builds/39014 https://ews-build.webkit.org/#/builders/10/builds/39020 https://ews-build.webkit.org/#/builders/10/builds/39024 https://ews-build.webkit.org/#/builders/10/builds/39029 https://ews-build.webkit.org/#/builders/10/builds/39032 https://ews-build.webkit.org/#/builders/10/builds/39034 https://ews-build.webkit.org/#/builders/10/builds/39038 https://ews-build.webkit.org/#/builders/10/builds/39050 https://ews-build.webkit.org/#/builders/10/builds/39051 https://ews-build.webkit.org/#/builders/10/builds/39057 https://ews-build.webkit.org/#/builders/10/builds/39056 https://ews-build.webkit.org/#/builders/10/builds/39078 https://ews-build.webkit.org/#/builders/10/builds/39081 https://ews-build.webkit.org/#/builders/10/builds/39084 Image Results: https://ews-build.s3-us-west-2.amazonaws.com/Windows-EWS/r411549-39084/transforms/2d/scale-change-composited-diffs.html
<rdar://problem/70374675>
I have marked this test as skip while this issue is investigated. https://trac.webkit.org/changeset/268580/webkit
The same issue is also happening with test transforms/2d/rotate-change-composited.html Same history Image Results: https://ews-build.s3-us-west-2.amazonaws.com/Windows-EWS/r411549-39084/transforms/2d/scale-change-composited-diffs.html I have marked this/these test(s as skip while this issue is investigated. https://trac.webkit.org/changeset/268582/webkit
One more from this group is also affected the same way. Test transforms/2d/translate-change-composited.html. Same history as the other two tests. Image Results: https://ews-build.s3-us-west-2.amazonaws.com/Windows-EWS/r411549-39084/transforms/2d/translate-change-composited-diffs.html I have marked this test as skip while this issue is investigated. https://trac.webkit.org/changeset/268584/webkit
Description: transforms/2d/scale-change-composited.html transforms/2d/rotate-change-composited.html transforms/2d/translate-change-composited.html I went back further and can see build https://ews-build.webkit.org/#/builders/10/builds/38853 appears to be the first occurrence. Around that same time period commit r268444 was made. This is were the test were added. The commit has to do with transform-origin is applied on top of invidivual CSS transform properties on composited layers, which could have introduced the flakiness. The change was introduced here https://trac.webkit.org/changeset/268444/webkit.
Description: transforms/2d/rotate-composited.html Same symptoms as the others in the group. I have marked this test as skip while this issue is investigated. REGRESSION(268444?): [ Win10 wk1 ews ] transforms/2d/scale-change-composited.html is a flaky failure
Description: transforms/2d/rotate-composited.html I have marked this test as skip while this issue is investigated. https://trac.webkit.org/changeset/268614/webkit