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<box id="b" observes="a"/>
<html:script xmlns:html="http://www.w3.org/1999/xhtml">
document.getElementById('b').addEventListener('DOMAttrModified', function(e) {document.removeChild(document.documentElement);}, true);
setTimeout(function() {document.getElementById('a').setAttribute('tabindex', '1') ;}, 100);
</html:script>
</window>