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Test Info:

<!DOCTYPE html>
<meta charset="utf-8">
<title>Renaming @keyframes rule after removeRule should not crash</title>
<style>
@keyframes foo {
0% { foo: bar; }
}
</style>
<script>
window.addEventListener('load', function() {
var e = document.styleSheets[0].cssRules[0];
e.cssRules.item(0).parentStyleSheet.deleteRule(0);
e.name = 'bar';
});
</script>