third_party/WebKit/LayoutTests/animations/keyword-composition-crash.html

<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<div id="target"></div>
<script>
test(() => {
  target.animate([{position: 'absolute'}], {fill: 'forwards'});
  target.animate([{position: 'static', composite: 'add'}], {fill: 'forwards'});
  getComputedStyle(target).position;
}, "Don't crash when compositing keyword animations.");
</script>