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Test Info:

<!DOCTYPE html>
<html>
<body>
<script>
var o1 = document.documentElement;
var o2 = document.createElement("frame");
document.documentElement.appendChild(o2);
var o3 = o2.contentWindow;
o1.parentNode.removeChild(o1);
o3.customElements;
</script>
</body>
</html>