Bug 217812

Summary: REGRESSION(268444?): [ Win10 wk1 ews ] individual transform properties tests are failing
Product: WebKit Reporter: Karl Rackler <rackler>
Component: New BugsAssignee: Nobody <webkit-unassigned>
Status: NEW ---    
Severity: Normal CC: graouts, webkit-bot-watchers-bugzilla, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   

Comment 1 Radar WebKit Bug Importer 2020-10-16 05:19:34 PDT
<rdar://problem/70374675>
Comment 2 Karl Rackler 2020-10-16 05:34:18 PDT
I have marked this test as skip while this issue is investigated.
https://trac.webkit.org/changeset/268580/webkit
Comment 3 Karl Rackler 2020-10-16 05:46:37 PDT
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
Comment 4 Karl Rackler 2020-10-16 05:54:03 PDT
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
Comment 5 Karl Rackler 2020-10-16 11:54:22 PDT
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.
Comment 6 Karl Rackler 2020-10-16 15:43:26 PDT
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
Comment 7 Karl Rackler 2020-10-16 15:45:19 PDT
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