Following the fix for https://bugs.webkit.org/show_bug.cgi?id=180402, the test at http/wpt/web-animations/interfaces/Animatable/animate-no-browsing-context-expected.txt has flaky failures because of the accuracy of the incorrect value logged, for instance: FAIL Replacing the timeline of an animation targetting an element in a document without a browsing context and then adopting that element causes it to start updating style assert_equals: Style should be updated expected "0" but got "0.3499999940395355"
This test does not exist anymore.