<!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>