[Webkit-unassigned] [Bug 207278] New: REGRESSION: (r255821) [ Mac wk1 ] imported/w3c/web-platform-tests/web-animations/timing-model/animations/finishing-an-animation.html

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=207278

            Bug ID: 207278
           Summary: REGRESSION: (r255821) [ Mac wk1 ]
                    imported/w3c/web-platform-tests/web-animations/timing-
                    model/animations/finishing-an-animation.html
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tsavell at apple.com
                CC: dino at apple.com

imported/w3c/web-platform-tests/web-animations/timing-model/animations/finishing-an-animation.html

This test began failing with the changes in https://trac.webkit.org/changeset/255821/webkit
I was able to reproduce this locally by simply running the test in iterations. I bisected it down to r255821.
This is a flaky failure and it seems this test is randomly getting an additional console message. 

History:
https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fweb-animations%2Ftiming-model%2Fanimations%2Ffinishing-an-animation.html

Diff:
--- /Volumes/Data/slave/catalina-release-tests-wk1/build/layout-test-results/imported/w3c/web-platform-tests/web-animations/timing-model/animations/finishing-an-animation-expected.txt
+++ /Volumes/Data/slave/catalina-release-tests-wk1/build/layout-test-results/imported/w3c/web-platform-tests/web-animations/timing-model/animations/finishing-an-animation-actual.txt
@@ -1,3 +1,4 @@
+CONSOLE MESSAGE: Unhandled Promise Rejection: AbortError: The operation was aborted.

 PASS Finishing an animation with a zero playback rate throws 
 PASS Finishing an infinite animation throws

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