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Test Info:

<head>
<script>
function boom()
{
document.getElementById("x").appendChild(document.createElementNS("http://www.w3.org/1999/xhtml", "span"));
}
</script>
</head>
<body onload="boom();">
<div style="column-count: 15;"><div style="column-count: 15;" id="x"><td style="display: block; height: 2.5em;"></td></div></div>
</body>
</html>