Automatic update from web-platform-testsSeveral fixes to manual fullscreen tests (#13102)
These tests are made to start after onload so that iframe content
doesn't change anymore:
* fullscreen/api/element-ready-check-containing-iframe-manual.html
* fullscreen/api/element-ready-check-not-allowed-manual.html
* fullscreen/api/element-request-fullscreen-and-exit-iframe-manual.html
* fullscreen/model/move-to-fullscreen-iframe-manual.html
fullscreen/rendering/ua-style-iframe-manual.html is updated to check
each subproperties individually rather than shorthand properties.
fullscreen/api/element-request-fullscreen-timing-manual.html is changed
so that the second test starts after an animation frame to work around
Gecko throttling rAF before the first paint.
Related bugs:
https://bugzilla.mozilla.org/show_bug.cgi?id=1493878https://github.com/w3c/csswg-drafts/issues/2529
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wpt-commits: b3c7bf4261939cd1aba9b3264152a718b634ffa7
wpt-pr: 13102