1845650 - [wpt-sync] Sync PR 41200 - Add a workaround for smooth scroll operations.

Status: RESOLVED FIXED

(Core :: DOM: CSS Object Model, task, P4)

Description

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Sync web-platform-tests PR 41200 into mozilla-central (this bug is closed when the sync is complete).

PR: https://github.com/web-platform-tests/wpt/pull/41200
Details from upstream follow.

Hiroyuki Ikezoe <[e-mail]> wrote:

Add a workaround for smooth scroll operations.

In Gecko there's a bug [1] that smooth scroll operations at the beginning of page loading are sometimes omitted. The bug is caused by a race condition in our architecture that smooth scroll operations are processed in a different process. Because of the bug the first test case in scroll-behavior-main-frame-{root|window}.html sometimes fails on Firefox. Just adding two awaiting rAFs avoids the race. And I believe it doesn't spoil the purpose of the test case itself.

Also I guess Blink has a similar race since the same test case fails [2] on Chrome. But I am not sure whether this workaround fixes the failure on Blink since I haven't been able to reproduce the Blink's failure locally.

[1] https://bugzilla.mozilla.org/show_bug.cgi?id=1845646
[2] https://wpt.fyi/results/css/cssom-view/scroll-behavior-main-frame-window.html?label=experimental&label=master&product=chrome&product=firefox&product=safari&aligned&view=interop&q=label%3Ainterop-2022-scrolling

Comment 1

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Pushed to try (stability) https://treeherder.mozilla.org/#/jobs?repo=try&revision=e143198df8b13581c5afdace0e881afe5cfe7d9c

Comment 2

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Test result changes from PR not available.

Comment 3

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Test result changes from PR not available.

Comment 4

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Test result changes from PR not available.

Comment 5

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Test result changes from PR not available.

Comment 6

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/343dfb1baa79
[wpt PR 41200] - Add a workaround for smooth scroll operations., a=testonly

Comment 7

[Cosmin Sabou [:CosminS]]

https://hg.mozilla.org/mozilla-central/rev/343dfb1baa79