2 <script src=
"../resources/testharness.js"></script>
3 <script src=
"../resources/testharnessreport.js"></script>
10 var element
= document
.getElementById('e');
11 var style
= getComputedStyle(element
);
14 var keyframeEffect
= new KeyframeEffect(element
,
15 [{opacity
: '1', offset
: 0},
16 {opacity
: '0', offset
: 1}],
20 var player
= document
.timeline
.play(keyframeEffect
);
22 player
.currentTime
= duration
/ 2;
23 assert_equals(style
.opacity
, '0.5');
24 }, 'Calling document.timeline.play() should start an animation.');