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<!DOCTYPE html>
<meta charset=utf-8>
<title>Animation.playbackRate</title>
<link rel="help" href="https://w3c.github.io/web-animations/#dom-animation-playbackrate">
<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";
function assert_playbackrate(animation,
previousAnimationCurrentTime,
previousTimelineCurrentTime,
description) {
var accuracy = 0.001; /* accuracy of DOMHighResTimeStamp */
var animationCurrentTimeDifference =
animation.currentTime - previousAnimationCurrentTime;
var timelineCurrentTimeDifference =
animation.timeline.currentTime - previousTimelineCurrentTime;
assert_approx_equals(animationCurrentTimeDifference,
timelineCurrentTimeDifference * animation.playbackRate,
accuracy,
description);
}
promise_test(function(t) {
var div = createDiv(t);
var animation = div.animate(null, 100 * MS_PER_SEC);
return animation.ready.then(function() {
animation.currentTime = 7 * MS_PER_SEC; // ms
animation.playbackRate = 0.5;
assert_equals(animation.currentTime, 7 * MS_PER_SEC,
'Reducing Animation.playbackRate should not change the currentTime ' +
'of a playing animation');
animation.playbackRate = 2;
assert_equals(animation.currentTime, 7 * MS_PER_SEC,
'Increasing Animation.playbackRate should not change the currentTime ' +
'of a playing animation');
});
}, 'Test the initial effect of setting playbackRate on currentTime');
promise_test(function(t) {
var div = createDiv(t);
var animation = div.animate(null, 100 * MS_PER_SEC);
animation.playbackRate = 2;
var previousTimelineCurrentTime;
var previousAnimationCurrentTime;
return animation.ready.then(function() {
previousAnimationCurrentTime = animation.currentTime;
previousTimelineCurrentTime = animation.timeline.currentTime;
return waitForAnimationFrames(1);
}).then(function() {
assert_playbackrate(animation,
previousAnimationCurrentTime,
previousTimelineCurrentTime,
'animation.currentTime should be 2 times faster than timeline.');
});
}, 'Test the effect of setting playbackRate on currentTime');
promise_test(function(t) {
var div = createDiv(t);
var animation = div.animate(null, 100 * MS_PER_SEC);
animation.playbackRate = 2;
var previousTimelineCurrentTime;
var previousAnimationCurrentTime;
return animation.ready.then(function() {
previousAnimationCurrentTime = animation.currentTime;
previousTimelineCurrentTime = animation.timeline.currentTime;
animation.playbackRate = 1;
return waitForAnimationFrames(1);
}).then(function() {
assert_equals(animation.playbackRate, 1,
'sanity check: animation.playbackRate is still 1.');
assert_playbackrate(animation,
previousAnimationCurrentTime,
previousTimelineCurrentTime,
'animation.currentTime should be the same speed as timeline now.');
});
}, 'Test the effect of setting playbackRate while playing animation');
</script>
</body>
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