LayoutTests/fast/css/css-keyframe-style-mutate-crash.html

<style>
@-webkit-keyframes foo { 1% { color: initial; } }
</style>
This test passes if it does not CRASH.
<script>
window.document.styleSheets[0].cssRules[0][0].style.color = 0;
if (window.testRunner)
    testRunner.dumpAsText();
</script>