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Test Info:

<!DOCTYPE html>
<meta charset="utf-8">
<title>Animation composite order</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/testcommon.js"></script>
<style>
@keyframes margin50 {
from {
margin-left: 50px;
}
to {
margin-left: 50px;
}
}
@keyframes margin100 {
from {
margin-left: 100px;
}
to {
margin-left: 100px;
}
}
</style>
<div id="log"</div>
<script>
'use strict';
promise_test(async t => {
const div = addDiv(t);
div.style.animation = 'margin100 100s';
assert_equals(getComputedStyle(div).marginLeft, '100px');
div.style.animation = 'margin50 100s, margin100 100s';
// The margin should be unaffected by margin50 since it is named earlier
// in the animation list.
assert_equals(getComputedStyle(div).marginLeft, '100px');
}, "Animations are composited by their order in the animation-name property.");
promise_test(async t => {
const div = addDiv(t);
const animA = div.animate({margin: ["100px","100px"]}, 100000);
assert_equals(getComputedStyle(div).marginLeft, '100px');
div.style.animation = 'margin50 100s';
// Wait for animation starts
await animA.ready;
await waitForAnimationFrames(1);
assert_equals(getComputedStyle(div).marginLeft, '100px',
"A higher-priority animation is not overriden by a more recent"
+ "one.");
}, 'Web-animation replaces CSS animation');
</script>