[Gecko Bug 1545707] Rework hidden-container-001.html CSS transitions tests #16518
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This behavior is not actually clearly specified yet.
See:
w3c/csswg-drafts#3790
But when it is specified it will most likely be specified in terms of HTML's
"being rendered" definition:
https://html.spec.whatwg.org/#being-rendered
I had planned to specify this behavior before updating these tests but I need to
update them first in order to add the ::marker tests for this bug.
Differential Revision: https://phabricator.services.mozilla.com/D28174
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1545707
gecko-commit: 6ccf33c9e56e44937858a86890a65c4296861d98
gecko-integration-branch: central
gecko-reviewers: hiro