merge_pr_50202
Support {Element|DocumentOrShadowRoot}.getAnimations({subtree: true}) for view-transitions.
There are two reasons we cannot use the original version of
pseudo-element-animaiton.html:
- Our finished promise is never resolved (Bug 1914322).
- We haven't imported the UA stylesheet (Bug 1914323, Bug 1914324).
So I need to write a new test based on our current implementation, and
rename the original pseudo-element-animations.html as
pseudo-element-animations-rerun.html.
Differential Revision: https://phabricator.services.mozilla.com/D231345
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1921109
gecko-commit: 2a99eda179fe52e825c1fa813df4524eaf3e76b3
gecko-reviewers: view-transitions-reviewers, emilio