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<!DOCTYPE html>
<title>Do not crash when animating to unresolved var()</title>
<link rel="help" href="https://drafts.css-houdini.org/css-properties-values-api/#dom-css-registerproperty">
<link rel="help" href="https://crbug.com/1185524">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="target"></div>
<script>
promise_test(async function(){
CSS.registerProperty({
name: '--x',
syntax: '<number>',
initialValue: '1',
inherits: false
});
let animation = target.animate({'--x': [ 'var(--unknown)']}, 100);
await animation.ready;
assert_equals(getComputedStyle(target).getPropertyValue('--x'), '1');
}, 'Do not crash when animating to unresolved var()');
</script>
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