Bug 285913 – imported/w3c/web-platform-tests/web-animations/timing-model/timelines/timelines.html is extremely flakey

• Status: NEW
• Component: Animations

[Jonathan Bedard]

imported/w3c/web-platform-tests/web-animations/timing-model/timelines/timelines.html is a flakey failure, and flakey enough that's it's impacting EWS.

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

This seems to have started around 288412@main.

We are expecting:
PASS Performs a microtask checkpoint after updating timelines

but getting:
FAIL Performs a microtask checkpoint after updating timelines assert_approx_equals: expected 182 +/- 0.001 but got 149

[Jonathan Bedard]

There are two commits around the time this test became flakey that seem quite relevant:
 https://commits.webkit.org/288404@main
https://commits.webkit.org/288402@main

[Radar WebKit Bug Importer]

<rdar://problem/142884114>

[Jonathan Bedard]

Pull request: https://github.com/WebKit/WebKit/pull/38996

[EWS]

Test gardening commit 288851@main (3c6f14ce1b1d): <https://commits.webkit.org/288851@main>

Reviewed commits have been landed. Closing PR #38996 and removing active labels.

[Antoine Quint]

Pull request: https://github.com/WebKit/WebKit/pull/39438

[EWS]

Test gardening commit 289283@main (b017844466f7): <https://commits.webkit.org/289283@main>

Reviewed commits have been landed. Closing PR #39438 and removing active labels.