compositing/visible-rect/iframe-no-layers.html is broken and confusing
Created attachment 233855 [details]
Comment on attachment 233855 [details]
View in context: https://bugs.webkit.org/attachment.cgi?id=233855&action=review
> + function testIsDone()
testIsDone is confusing because it's not done until called twice. Add a comment here saying that one call is from the subframe.