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Test Info:

<!DOCTYPE html>
<iframe srcdoc="<iframe></iframe>"></iframe>
<script>
onload = function() {
parent = frames[0];
child = parent[0];
child.onunload = function() {
parent.document.open();
parent.document.write("Nested");
}
parent.document.open();
parent.document.write("Hello");
}
</script>