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<!DOCTYPE html>
<body>
You should see the word "worked" in the frame below.<br>
<iframe></iframe>
<script>
var doc = document.getElementsByTagName("iframe")[0].contentDocument;
doc.open(); doc.write("\u003cscript>document.write(\"\\u003cscript src='nested-document-write-external.js'>\\u003c/script>r\"); document.write(\"k\");\u003c/script>e"); doc.write("d"); doc.close();</script>