gecko-dev/layout/xul/crashtests/417509.xhtml

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HTML

<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
<span id="a" datasources="" xmlns="http://www.w3.org/1999/xhtml"/>
<script xmlns="http://www.w3.org/1999/xhtml">
document.documentElement.appendChild(document.getElementById('a'));
</script>
</window>