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<!DOCTYPE HTML>
<html>
<head>
<script type="text/javascript">
function init() {
// This will throw a HierarchyRequestError exception
var doc = document.implementation.createDocument(null, 'DOC', null);
doc.documentElement.appendChild(doc);
}
window.addEventListener("load", init);
</script>
</head>
<body>
Testcase for bug 415498. This page should show an exception in Error Console on load
</body>