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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");
var doomed = document.getElementById("doomed");
doomed.remove();
var colgroup1 = document.createElement("colgroup");
table.appendChild(colgroup1);
var thead = document.createElement("thead");
var tr = document.createElement("tr");
var td = document.createElement("td");
td.setAttribute("colspan", 0);
tr.appendChild(td);
thead.appendChild(tr);
table.insertBefore(thead, colgroup1);
colgroup1.remove();
var colgroup2 = document.createElement("colgroup");
table.appendChild(colgroup2);
}
</script>
</head>
<body onload="boom();">
<table id="table"><tbody><tr id="doomed"><td>x</tr></tbody></table>
</body>
</html>