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diff --git a/testing/web-platform/tests/css/css-properties-values-api/animate-invalid.html b/testing/web-platform/tests/css/css-properties-values-api/animate-invalid.html
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+++ b/testing/web-platform/tests/css/css-properties-values-api/animate-invalid.html
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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>