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<?xml version="1.0"?>
<?xml-stylesheet href="chrome://global/skin" type="text/css"?>

<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">

<script type="text/javascript">
<![CDATA[

function boom()
{
  var x = document.getElementById("x");
  
  x.appendChild(document.createTextNode("A"));
  x.appendChild(document.createTextNode("\u202B" + "C"));

  document.getBoxObjectFor(document.documentElement).height; // flush layout

  x.normalize();
  x.appendChild(document.createTextNode("D"));
}

window.addEventListener("load", boom, false);

]]>
</script>

<box id="x" style="display:inline"><box/></box>
</window>