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<!doctype html>
<meta charset=utf-8>
<title>The effect value of a keyframe effect: Calculating the interval
distance between keyframes</title>
<link rel="help" href="https://drafts.csswg.org/web-animations/#the-effect-value-of-a-keyframe-animation-effect">
<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(t => {
// In Firefox there was a floating precision bug in the calculation of the
// progress at the end of the 0.2<->1.0 interval. This test exercises that
// calculation in case other UAs suffer from the same problem.
const target = createDiv(t);
const anim = target.animate(
[
{ opacity: 0 },
{ offset: 0.2, opacity: 1, easing: 'step-end' },
{ opacity: 0 },
],
{
duration: 1000,
fill: 'forwards',
}
);
anim.currentTime = 1000;
assert_equals(getComputedStyle(target).opacity, '0');
}, 'Interval distance is calculated correctly (precision test)');
</script>
</body>
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