I occasionally see animations/play-state.html fail when running the regression tests. This evening it failed on our new leaks bot: <http://build.webkit.org/results/SnowLeopard%20Intel%20Leaks/r47490%20(3)/animations/play-state-pretty-diff.html>. After looking at it for a few moments I noticed that the test fails very frequently when opened in-browser. Can we do something to make this test more robust?
A related fix: 33748
Bug 42821 is a newer version of this same bug. Probably similar root causes.