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Test Info:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<script>
function boom()
{
var table = document.getElementById("table");
table.insertBefore(document.createElement("thead"), document.getElementById("A"));
var tb2 = document.createElement("tfoot");
var tr1 = document.createElement("tr");
tb2.appendChild(tr1);
table.appendChild(tb2);
var tr = document.createElement("tr");
var td = document.createElement("td");
td.appendChild(document.createTextNode("td"));
td.setAttribute("rowspan", 0);
tr.appendChild(td);
document.getElementById("B").appendChild(tr);
}
</script>
</head>
<body onload="boom();">
<table id="table">
<tfoot id="A"><tr><td>td</td></tr></tfoot>
<tfoot id="B"><tr><td>td</td></tr></tfoot>
<thead></thead>
</table>
</body>
</html>