sousa-gecko/testing/web-platform/tests/css/css-animations/crashtests/keyframe-timing-function-unset.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>Keyframe with animation-timing-function unset should not crash</title>
<link rel="help" href="https://crbug.com/40081010">
<style>
@keyframes anim {
  from { animation-timing-function: unset; }
  50% { animation-timing-function: inherit; }
  to { animation-timing-function: initial; }
}
</style>

<div style="animation: anim 10s">This test passes if it doesn't crash</div>