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<?xml version="1.0"?>
<?xml-stylesheet href="chrome://global/skin/global.css" type="text/css"?>
<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" 
        xmlns:xhtml="http://www.w3.org/1999/xhtml">
<xhtml:div id="root">
<xhtml:div id="target">
</xhtml:div>
</xhtml:div>
<script>
<![CDATA[
    var io = new IntersectionObserver(function () {
    }, { root: document.getElementById('root') });
    io.observe(document.getElementById('target'));
]]>
</script>
</window>