The following test is timing (and sometimes failing) on GTK since a long time: fast/animation/css-animation-resuming-when-visible-with-style-change.html
fast/animation/css-animation-resuming-when-visible-with-style-change2.html is flaky too, with failure/pass
The test(s) filed under this bug have been consistently passing for the last 4000 revisions. Marking bug as fixed. Committed r263254: <https://trac.webkit.org/changeset/263254>