[Webkit-unassigned] [Bug 210134] New: [ Mac WK1 ] media/track/track-css-user-override.html is a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=210134

            Bug ID: 210134
           Summary: [ Mac WK1 ] media/track/track-css-user-override.html
                    is a flaky 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: tsavell at apple.com

media/track/track-css-user-override.html

This test is a highly intermittent failure. fails maybe once a day. 

I am able to reproduce the tests by running command:

run-webkit-tests --iterations 2000 --exit-after-n-failures 1 --exit-after-n-crashes-or-timeouts 1 --debug-rwt-logging --no-retry --force --no-build -f -1  media/track/track-css-user-override.html

History:
https://results.webkit.org/?suite=layout-tests&test=media%2Ftrack%2Ftrack-css-user-override.html


--- /Volumes/Data/slave/catalina-debug-tests-wk1/build/layout-test-results/media/track/track-css-user-override-expected.txt
+++ /Volumes/Data/slave/catalina-debug-tests-wk1/build/layout-test-results/media/track/track-css-user-override-actual.txt
@@ -23,7 +23,7 @@
 ** Mark background-color '!important' **
 RUN(internals.setCaptionsStyleSheetOverride('video::cue { color: blue ; background-color: yellow !important; }'))
 EXPECTED (getComputedStyle(textTrackDisplayElement(video, 'cue')).color == 'rgb(128, 0, 128)') OK
-EXPECTED (getComputedStyle(textTrackDisplayElement(video, 'cue')).backgroundColor == 'rgb(255, 255, 0)') OK
+EXPECTED (getComputedStyle(textTrackDisplayElement(video, 'cue')).backgroundColor == 'rgb(255, 255, 0)'), OBSERVED 'rgb(0, 255, 0)' FAIL

 ** Mark color '!important' **
 RUN(stylesheet.insertRule('video::cue { color: blue !important; background-color: yellow !important; }', 0))

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