Following the fix for https://bugs.webkit.org/show_bug.cgi?id=180402, the test at http/wpt/web-animations/interfaces/Animation/onfinish.html sometimes a TIMEOUT, in the WPT harness not RWT itself: TIMEOUT onfinish event is fired when the currentTime > 0 and the playbackRate > 0 Test timed out
This test does not exist anymore.