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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Animations: adjust value of CSS variable used in keyframes</title>
<link rel="help" href="https://drafts.csswg.org/css-animations/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/testcommon.js"></script>
<style>
@keyframes anim {
from { margin-left: var(--margin-left) }
to { margin-left: calc(var(--margin-left) * 2) }
}
</style>
<div id="log"></div>
<script>
test(t => {
const div = addDiv(t);
div.style.setProperty('--margin-left', '100px');
div.style.animation = 'anim 1s linear';
const animation = div.getAnimations()[0];
animation.currentTime = 500;
assert_equals(
getComputedStyle(div).marginLeft,
'150px',
'Animated value before updating variable'
);
div.style.setProperty('--margin-left', '200px');
assert_equals(
getComputedStyle(div).marginLeft,
'300px',
'Animated value after updating variable'
);
}, 'Animations reflect changes to variables on element');
test(t => {
const parentDiv = addDiv(t);
const div = addDiv(t);
parentDiv.appendChild(div);
parentDiv.style.setProperty('--margin-left', '100px');
div.style.animation = 'anim 1s linear';
const animation = div.getAnimations()[0];
animation.currentTime = 500;
assert_equals(
getComputedStyle(div).marginLeft,
'150px',
'Animated value before updating variable'
);
parentDiv.style.setProperty('--margin-left', '200px');
assert_equals(
getComputedStyle(div).marginLeft,
'300px',
'Animated value after updating variable'
);
}, 'Animations reflect changes to variables on parent element');
</script>
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