1828208 - [wpt-sync] Sync PR 39556 - [scroll-animations] Allow lookups of ancestor-attached timelines

Status: NEW

(Testing :: web-platform-tests, task, P4)

Description

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

Sync web-platform-tests PR 39556 into mozilla-central (this bug is closed when the sync is complete).

PR: https://github.com/web-platform-tests/wpt/pull/39556
Details from upstream follow.

Anders Hartvoll Ruud <[e-mail]> wrote:

[scroll-animations] Allow lookups of ancestor-attached timelines

Timelines with attachment=kAncestor are supposed to behave as kLocal
if there is no corresponding kDefer timeline in the ancestor chain.

This is implemented in this CL by allowing animations to look up
ancestor-attached timelines, but only when they don't have any
corresponding attaching timeline.

Bug: 1425939
Change-Id: I1bb620ac1f83648c5b98f44ab4c05c08ae9deb15
Reviewed-on: https://chromium-review.googlesource.com/4427779
WPT-Export-Revision: 1d9695a2ac97ba0357385c31aa3a71158d5e2952

Comment 1

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

PR 39556 applied with additional changes from upstream: 0bfffd48d12890b02caf178965a0f9b40567992b