Bug 266171 – [web-animations] compositing/layer-creation/scale-rotation-animation-overlap.html is a timeout on Sonoma

• Status: RESOLVED
• Resolution: FIXED
• Component: Tools / Tests

[Antoine Quint]

While this test has previously been marked as a timeout on wk1 and iOS (see bug 243494), I see it as a constant timeout on Sonoma.

[Antoine Quint]

This appears to have regressed between 268394@main and 268487@main. The only commit on this range (https://github.com/WebKit/WebKit/compare/b70eda7d68835d7dfa22e86463fbb90263b0e619...f685afa11acafdf44fd60af91b837cb1f3bf85f9) that looks vaguely related is 268412@main.

[Antoine Quint]

We fail to get an `animationstart` event even though getAnimations() returns a CSSAnimation object as expected.

[Antoine Quint]

We don't actually fail to get an `animationstart` event, this seems entirely tied to DOM performance.

With a debug build the call to makeDots() in the test takes about 5.5 seconds. Then it takes over 9 seconds for the `animationstart` event to be obtained. Then once we call notifyDone() it takes about 11 seconds in `TestRunner::notifyDone()` for the call to `injectedBundle.page()->dump()` to finish. Depending on how fast the system is, this ends up tallying up to over 30 seconds and for the test to time out.

With a release build, the entire test runs in about 200ms on the same hardware :)

[Antoine Quint]

Pull request: https://github.com/WebKit/WebKit/pull/21594

[EWS]

Committed 271845@main (e91a040d895d): <https://commits.webkit.org/271845@main>

Reviewed commits have been landed. Closing PR #21594 and removing active labels.

[Radar WebKit Bug Importer]

<rdar://problem/119463827>