* partially-out-of-view-animation.html
This test is a normal test case (i.e. a trivial one). An animation on an
element which is partially out of the view. If ofscreen optimization
is totally broken, this test will fail.
* in-visibility-hidden-animation-pseudo-element.html
This test checks animation on visible pseudo element which is attached to
invisible element is not throttled.
* in-visibility-hidden-animation.html
This test checks animation on visible element which is inherited from
invisible parent element is not throttled.
Hiroyuki Ikezoe