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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /css/css-transitions/KeyframeEffect-getKeyframes.tentative.html - WPT Dashboard Interop Dashboard
<!doctype html>
<meta charset=utf-8>
<title>KeyframeEffect.getKeyframes() for CSS transitions</title>
<!-- TODO: Add a more specific link for this once it is specified. -->
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/helper.js"></script>
<style>
:root {
--var-100px: 100px;
}
</style>
<div id="log"></div>
<script>
'use strict';
const getKeyframes = e => {
return e.getAnimations()[0].effect.getKeyframes();
};
const assert_frames_equal = (a, b, name) => {
assert_equals(
Object.keys(a).sort().toString(),
Object.keys(b).sort().toString(),
`properties on ${name}`
);
for (const p in a) {
assert_equals(a[p], b[p], `value for '${p}' on ${name}`);
}
};
test(t => {
const div = addDiv(t);
div.style.left = '0px';
getComputedStyle(div).transitionProperty;
div.style.transition = 'left 100s';
div.style.left = '100px';
const frames = getKeyframes(div);
assert_equals(frames.length, 2, 'number of frames');
const expected = [
{ offset: 0,
computedOffset: 0,
easing: 'linear',
composite: 'auto',
left: '0px',
},
{
offset: 1,
computedOffset: 1,
easing: 'linear',
composite: 'auto',
left: '100px',
},
];
for (let i = 0; i < frames.length; i++) {
assert_frames_equal(frames[i], expected[i], `ComputedKeyframe #${i}`);
}
}, 'KeyframeEffect.getKeyframes() returns expected frames for a simple'
+ ' transition');
test(t => {
const div = addDiv(t);
div.style.left = '0px';
getComputedStyle(div).transitionProperty;
div.style.transition = 'left 100s steps(2,end)';
div.style.left = '100px';
const frames = getKeyframes(div);
assert_equals(frames.length, 2, 'number of frames');
const expected = [
{
offset: 0,
computedOffset: 0,
easing: 'linear',
composite: 'auto',
left: '0px',
},
{
offset: 1,
computedOffset: 1,
easing: 'linear',
composite: 'auto',
left: '100px',
},
];
for (let i = 0; i < frames.length; i++) {
assert_frames_equal(frames[i], expected[i], `ComputedKeyframe #${i}`);
}
}, 'KeyframeEffect.getKeyframes() returns frames unaffected by a non-default easing function');
test(t => {
const div = addDiv(t);
div.style.left = '0px';
getComputedStyle(div).transitionProperty;
div.style.transition = 'left 100s';
div.style.left = 'var(--var-100px)';
const frames = getKeyframes(div);
// CSS transition endpoints are based on the computed value so we
// shouldn't see the variable reference
const expected = [
{
offset: 0,
computedOffset: 0,
easing: 'linear',
composite: 'auto',
left: '0px',
},
{
offset: 1,
computedOffset: 1,
easing: 'linear',
composite: 'auto',
left: '100px',
},
];
for (let i = 0; i < frames.length; i++) {
assert_frames_equal(frames[i], expected[i], `ComputedKeyframe #${i}`);
}
}, 'KeyframeEffect.getKeyframes() returns expected frames for a'
+ ' transition with a CSS variable endpoint');
test(t => {
const div = addDiv(t);
div.style.left = '0px';
getComputedStyle(div).transitionProperty;
div.style.transition = 'left 100s';
div.style.left = '100px';
// Resetting the effect target before retrieving the keyframes should not
// affect the computed property values.
const anim = div.getAnimations()[0];
anim.effect.target = null;
const frames = anim.effect.getKeyframes();
const expected = [
{
offset: 0,
computedOffset: 0,
easing: 'linear',
composite: 'auto',
left: '0px',
},
{
offset: 1,
computedOffset: 1,
easing: 'linear',
composite: 'auto',
left: '100px',
},
];
for (let i = 0; i < frames.length; i++) {
assert_frames_equal(frames[i], expected[i], `ComputedKeyframe #${i}`);
}
}, 'KeyframeEffect.getKeyframes() returns expected frames for a'
+ ' transition after resetting the effect target');
</script>