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diff --git a/testing/web-platform/tests/web-animations/interfaces/AnimationEffectTiming/getComputedStyle.html b/testing/web-platform/tests/web-animations/interfaces/AnimationEffectTiming/getComputedStyle.html
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+++ b/testing/web-platform/tests/web-animations/interfaces/AnimationEffectTiming/getComputedStyle.html
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+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>getComputedStyle tests</title>
+<link rel="help" href="http://w3c.github.io/web-animations/#animationeffecttiming">
+<link rel="author" title="Ryo Motozawa" href="mailto:motozawa@mozilla-japan.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../../testcommon.js"></script>
+<body>
+<div id="log"></div>
+<script>
+'use strict';
+
+test(function(t) {
+  var div = createDiv(t);
+  var anim = div.animate({ opacity: [ 0, 1 ] }, 100000);
+  anim.finish();
+  assert_equals(getComputedStyle(div).opacity, '1', 'animation finished');
+  anim.effect.timing.duration *= 2;
+  assert_equals(getComputedStyle(div).opacity, '0.5', 'set double duration');
+  anim.effect.timing.duration = 0;
+  assert_equals(getComputedStyle(div).opacity, '1', 'set duration 0');
+  anim.effect.timing.duration = 'auto';
+  assert_equals(getComputedStyle(div).opacity, '1', 'set duration \'auto\'');
+}, 'changed duration immediately updates its computed styles');
+
+test(function(t) {
+  var div = createDiv(t);
+  var anim = div.animate({ opacity: [ 0, 1 ] }, 100000);
+  anim.finish();
+  assert_equals(getComputedStyle(div).opacity, '1', 'animation finished');
+  anim.effect.timing.iterations = 2;
+  assert_equals(getComputedStyle(div).opacity, '0', 'set 2 iterations');
+  anim.effect.timing.iterations = 0;
+  assert_equals(getComputedStyle(div).opacity, '1', 'set iterations 0');
+  anim.effect.timing.iterations = Infinity;
+  assert_equals(getComputedStyle(div).opacity, '0', 'set iterations Infinity');
+}, 'changed iterations immediately updates its computed styles');
+
+test(function(t) {
+  var div = createDiv(t);
+  var anim = div.animate({ opacity: [ 1, 0 ] },
+                         { duration: 10000, endDelay: 1000, fill: 'none' });
+
+  anim.currentTime = 9000;
+  assert_equals(getComputedStyle(div).opacity, '0.1',
+                'set currentTime during duration');
+
+  anim.currentTime = 10900;
+  assert_equals(getComputedStyle(div).opacity, '1',
+                'set currentTime during endDelay');
+
+  anim.currentTime = 11100;
+  assert_equals(getComputedStyle(div).opacity, '1',
+                'set currentTime after endDelay');
+}, 'change currentTime when fill is none and endDelay is positive');
+
+test(function(t) {
+  var div = createDiv(t);
+  var anim = div.animate({ opacity: [ 1, 0 ] },
+                         { duration: 10000,
+                           endDelay: 1000,
+                           fill: 'forwards' });
+  anim.currentTime = 5000;
+  assert_equals(getComputedStyle(div).opacity, '0.5',
+                'set currentTime during duration');
+
+  anim.currentTime = 9999;
+  assert_equals(getComputedStyle(div).opacity, '0.0001',
+                'set currentTime just a little before duration');
+
+  anim.currentTime = 10900;
+  assert_equals(getComputedStyle(div).opacity, '0',
+                'set currentTime during endDelay');
+
+  anim.currentTime = 11100;
+  assert_equals(getComputedStyle(div).opacity, '0',
+                'set currentTime after endDelay');
+}, 'change currentTime when fill forwards and endDelay is positive');
+
+test(function(t) {
+  var div = createDiv(t);
+  var anim = div.animate({ opacity: [ 1, 0 ] },
+                         { duration: 10000, endDelay: -5000, fill: 'none' });
+
+  anim.currentTime = 1000;
+  assert_equals(getComputedStyle(div).opacity, '0.9',
+                'set currentTime before endTime');
+
+  anim.currentTime = 10000;
+  assert_equals(getComputedStyle(div).opacity, '1',
+                'set currentTime after endTime');
+}, 'change currentTime when fill none and endDelay is negative');
+
+test(function(t) {
+  var div = createDiv(t);
+  var anim = div.animate({ opacity: [ 1, 0 ] },
+                         { duration: 10000,
+                           endDelay: -5000,
+                           fill: 'forwards' });
+
+  anim.currentTime = 1000;
+  assert_equals(getComputedStyle(div).opacity, '0.9',
+                'set currentTime before endTime');
+
+  anim.currentTime = 5000;
+  assert_equals(getComputedStyle(div).opacity, '0.5',
+                'set currentTime same as endTime');
+
+  anim.currentTime = 10000;
+  assert_equals(getComputedStyle(div).opacity, '0',
+                'set currentTime after endTime');
+}, 'change currentTime when fill forwards and endDelay is negative');
+
+test(function(t) {
+  var div = createDiv(t);
+  var anim = div.animate({ opacity: [ 0, 1 ] },
+                         { duration: 10000,
+                           direction: 'normal' });
+
+  anim.currentTime = 7000;
+  anim.effect.timing.direction = 'reverse';
+
+  assert_equals(getComputedStyle(div).opacity, '0.3',
+                'change direction from "normal" to "reverse"');
+}, 'change direction from "normal" to "reverse"');
+
+test(function(t) {
+  var div = createDiv(t);
+  var anim = div.animate({ opacity: [ 0, 1 ] },
+                         { iterations: 2,
+                           duration: 10000,
+                           direction: 'normal' });
+
+  anim.currentTime = 17000;
+  anim.effect.timing.direction = 'alternate';
+
+  assert_equals(getComputedStyle(div).opacity, '0.3',
+                'change direction from "normal" to "alternate"');
+  }, 'change direction from "normal" to "alternate"');
+
+test(function(t) {
+  var div = createDiv(t);
+  var anim = div.animate({ opacity: [ 0, 1 ] },
+                         { iterations: 2,
+                           duration: 10000,
+                           direction: 'normal' });
+
+  anim.currentTime = 17000;
+  anim.effect.timing.direction = 'alternate-reverse';
+
+  assert_equals(getComputedStyle(div).opacity, '0.7',
+                'change direction from "normal" to "alternate-reverse"');
+}, 'change direction from "normal" to "alternate-reverse"');
+
+test(function(t) {
+  var div = createDiv(t);
+  var anim = div.animate({ opacity: [ 0, 1 ] },
+                         { fill: 'backwards',
+                           duration: 10000,
+                           direction: 'normal' });
+
+  // test for a flip of value at the currentTime = 0
+  anim.effect.timing.direction = 'reverse';
+
+  assert_equals(getComputedStyle(div).opacity, '1',
+                'change direction from "normal" to "reverse" ' +
+                'at the starting point');
+}, 'change direction from "normal" to "reverse"');
+
+</script>
+</body>