From bug 1326306 comment 4 I did check that all of the recent failures happened in the first test case. One interesting thing is that some of failures received 7 restyles instead of 6 restyles. I am convinced that one restyle comes from creating a thumbnail (See bug 1276170). I guess the other one is the root cause of this recent failure. I think there was a change on Android that causes flush style after the document has been finished to be loaded. There seems to be something that causes style flush when a page initially loaded. This bug is for tracking it down.

For the record, that test started to failing on aurora too. The beginning is: https://treeherder.mozilla.org/#/jobs?repo=mozilla-aurora&revision=d8d335074d5c896ccacce5e302baae193e62dbaf

Stealing. https://treeherder.mozilla.org/#/jobs?repo=try&revision=66b935eb5680e54b5d8d26938dbb47225ebf9ccf Now test_restyles.html runs in content window (bug 1379515), so it should not receive unexpected animation restyles in chrome window any more.

(In reply to Hiroyuki Ikezoe (:hiro) from comment #2) > Stealing. > https://treeherder.mozilla.org/#/ > jobs?repo=try&revision=66b935eb5680e54b5d8d26938dbb47225ebf9ccf There are some oranges on the try, but all of them are bug 1363957.

Also note that on our CI, mochitest-plains don't run on Android x86. I don't know the reason though.

Comment on attachment 8923615 [details] Bug 1335986 - Run test_restyles.html on Android. https://reviewboard.mozilla.org/r/194746/#review199790

Thanks for the quick review!

Pushed by hikezoe@mozilla.com: https://hg.mozilla.org/integration/autoland/rev/8d224ee53eda Run test_restyles.html on Android. r=birtles