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<!DOCTYPE html>
<meta charset=utf-8>
<title>The effect value of a keyframe effect: Calculating the transformed
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>
<script src="../../resources/easing-tests.js"></script>
<body>
<div id="log"></div>
<script>
'use strict';
// Test that applying easing to keyframes is applied as expected
for (const params of gEasingTests) {
test(t => {
const target = createDiv(t);
const anim = target.animate([ { width: '0px' },
// We put the easing on the second keyframe
// so we can test that it is only applied
// to the specified keyframe.
{ width: '100px', easing: params.easing },
{ width: '200px' } ],
{ duration: 2000,
fill: 'forwards' });
for (const sampleTime of [0, 999, 1000, 1100, 1500, 2000]) {
anim.currentTime = sampleTime;
const portion = (sampleTime - 1000) / 1000;
const expectedWidth = sampleTime < 1000
? sampleTime / 10 // first segment is linear
: 100 + params.easingFunction(portion) * 100;
assert_approx_equals(parseFloat(getComputedStyle(target).width),
expectedWidth,
0.02,
'The width should be approximately ' +
`${expectedWidth} at ${sampleTime}ms`);
}
}, `A ${params.desc} on a keyframe affects the resulting style`);
}
// Test that a linear-equivalent cubic-bezier easing applied to a keyframe does
// not alter (including clamping) the result.
for (const params of gEasingTests) {
const linearEquivalentEasings = [ 'cubic-bezier(0, 0, 0, 0)',
'cubic-bezier(1, 1, 1, 1)' ];
test(t => {
for (const linearEquivalentEasing of linearEquivalentEasings) {
const timing = { duration: 1000,
fill: 'forwards',
easing: params.easing };
const linearTarget = createDiv(t);
const linearAnim = linearTarget.animate([ { width: '0px' },
{ width: '100px' } ],
timing);
const equivalentTarget = createDiv(t);
const equivalentAnim =
equivalentTarget.animate([ { width: '0px',
easing: linearEquivalentEasing },
{ width: '100px' } ],
timing);
for (const sampleTime of [0, 250, 500, 750, 1000]) {
linearAnim.currentTime = sampleTime;
equivalentAnim.currentTime = sampleTime;
assert_equals(getComputedStyle(linearTarget).width,
getComputedStyle(equivalentTarget).width,
`The 'width' of the animated elements should be equal ` +
`at ${sampleTime}ms`);
}
}
}, 'Linear-equivalent cubic-bezier keyframe easing applied to an effect ' +
`with a ${params.desc} does not alter the result`);
}
</script>
</body>
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