[Webkit-unassigned] [Bug 217478] New: REGRESSION (r268138): [ Mojave+ wk1 ] imported/w3c/web-platform-tests/css/css-masking/clip-path/clip-path-descendant-text-mutated-001.html is a flaky image failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=217478

            Bug ID: 217478
           Summary: REGRESSION (r268138): [ Mojave+ wk1 ]
                    imported/w3c/web-platform-tests/css/css-masking/clip-p
                    ath/clip-path-descendant-text-mutated-001.html is a
                    flaky image failure
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rackler at apple.com

Description:
imported/w3c/web-platform-tests/css/css-masking/clip-path/clip-path-descendant-text-mutated-001.html

The first flaky image failure that I see this on the dashboard was 10/07/20 at r268142, but is not relevant to what would have caused this.

The test is part of an import of all clip-path WPTs at r268138 and has been a flaky image failure since it was introduced.

The test was expecting a width: 100px; height: 100px; background-color: green, but instead returned and additional width: 100px; height: 100px; background-color: red.

REPRODUCTION STEPS
Command: 
run-webkit-tests -1 imported/w3c/web-platform-tests/css/css-masking/clip-path/clip-path-descendant-text-mutated-001.html

Result: 
Regressions: Unexpected image-only failures (1)
  imported/w3c/web-platform-tests/css/css-masking/clip-path/clip-path-descendant-text-mutated-001.html [ ImageOnlyFailure ]

History:
https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fcss%2Fcss-masking%2Fclip-path%2Fclip-path-descendant-text-mutated-001.html&version_name=Catalina&version_name=Mojave&flavor=wk1&limit=50000

Image Results:
https://build.webkit.org/results/Apple-Catalina-Release-WK1-Tests/r268179%20(9704)/imported/w3c/web-platform-tests/css/css-masking/clip-path/clip-path-descendant-text-mutated-001-diffs.html

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