chromium/third_party/blink/web_tests/animations/stability/animate-shorthand-var-crash.html

<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<style>
@keyframes crash {
  from { border-radius: var(--) }
}
#target {
  animation: crash 1s infinite;
}
</style>
<div id="target"></div>
<script>
test(() => {
  getComputedStyle(target).borderRadius;
}, 'Do not crash when animating a shorthand with var().');
</script>