chromium/third_party/blink/web_tests/fast/css/variables/shorthand-var-animation-crash.html

<!DOCTYPE html>
<script src="../../../resources/testharness.js"></script>
<script src="../../../resources/testharnessreport.js"></script>
<div id="target"></div>
<script>
test(() => {
  target.animate({background: 'var(--x)'});
}, 'This test passes if it does not crash');
</script>