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chromium/third_party/blink/web_tests/fast/parser/close-while-stopping.html 

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
<head>
<script src="../../resources/js-test.js"></script>
</head>
<body>
<iframe id="aframe"></iframe>
<script>
description("Test that explicitly closing the document while it is already closing doesn't result in running the end twice.");

var frameDocument = document.getElementById("aframe").contentDocument;
frameDocument.open();
frameDocument.onreadystatechange = function()
{
    debug(frameDocument.readyState);
    frameDocument.close();
};
frameDocument.write("<script>document.close()</scr"+"ipt>");
</script>
</body>
</html>