<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script>
function boom()
{
  document.getElementById("span").appendChild(document.createTextNode("XXX"));
  find("XXX");
}
</script>
</head>

<body onload="boom();" style="width: 15em;">
<div style="-moz-column-count: 2;">
<span id="span"><div>yo yo yo yo yo yo yo yo</div></span>
</div>

</body>
</html>