Bug 210549

Summary:	REGRESSION( r260114): [ Mac and iOS ] imported/w3c/web-platform-tests/web-animations/timing-model/timelines/document-timelines.html is failing.
Product:	WebKit	Reporter:	Jason Lawrence <Lawrence.j>
Component:	Animations	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	dino, webkit-bot-watchers-bugzilla, webkit-bug-importer, zalan
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Mac
OS:	macOS 10.15

Description Jason Lawrence 2020-04-15 08:10:37 PDT

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

Comment 1 Radar WebKit Bug Importer 2020-04-15 08:10:58 PDT

<rdar://problem/61828495>

Comment 2 Jason Lawrence 2020-04-15 08:13:06 PDT

I was able to reproduce this issue with r260114, but cannot reproduce it with r260113.

r260114:
run-webkit-tests --iterations 99 --exit-after-n-failures 3 --force -f imported/w3c/web-platform-tests/web-animations/timing-model/timelines/document-timelines.html

[30/99] imported/w3c/web-platform-tests/web-animations/timing-model/timelines/document-timelines.html failed unexpectedly (text diff)
[46/99] imported/w3c/web-platform-tests/web-animations/timing-model/timelines/document-timelines.html failed unexpectedly (text diff)
[48/99] imported/w3c/web-platform-tests/web-animations/timing-model/timelines/document-timelines.html failed unexpectedly (text diff)
Exiting early after 3 failures. 45 tests run.

42 tests ran as expected, 3 didn't (54 didn't run):

r260113:
All 99 tests ran as expected.

Comment 3 zalan 2020-04-15 11:21:18 PDT

Committed r260140: <https://trac.webkit.org/changeset/260140>

Comment 4 zalan 2020-04-15 11:21:41 PDT

see also bug 210559