[Webkit-unassigned] [Bug 210549] New: REGRESSION( r260114): [ Mac and iOS ] imported/w3c/web-platform-tests/web-animations/timing-model/timelines/document-timelines.html is failing.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=210549

            Bug ID: 210549
           Summary: REGRESSION( r260114): [ Mac and iOS ]
                    imported/w3c/web-platform-tests/web-animations/timing-
                    model/timelines/document-timelines.html is failing.
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: Lawrence.j at apple.com
                CC: dino at apple.com

imported/w3c/web-platform-tests/web-animations/timing-model/timelines/document-timelines.html

Description:
This test is flaky failing on iOS and Mac. The test appears to have regressed with r260114.

History:
https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fweb-animations%2Ftiming-model%2Ftimelines%2Fdocument-timelines.html&platform=ios&platform=mac

Diff:
--- /Volumes/Data/slave/catalina-release-tests-wk1/build/layout-test-results/imported/w3c/web-platform-tests/web-animations/timing-model/timelines/document-timelines-expected.txt
+++ /Volumes/Data/slave/catalina-release-tests-wk1/build/layout-test-results/imported/w3c/web-platform-tests/web-animations/timing-model/timelines/document-timelines-actual.txt
@@ -1,4 +1,4 @@

-PASS Document timelines report current time relative to navigationStart 
+FAIL Document timelines report current time relative to navigationStart assert_equals: The current time matches requestAnimationFrame time expected 13.000000000000002 but got 13
 PASS Child frames do not report negative initial times

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