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Test Info:

<!doctype html public "-//w3c//dtd html 3.2//en">↩
<html>↩
<head>↩
<title>testcase</title>↩
<script>↩
function doit()↩
{↩
var doc = window.document;↩
var t1 = doc.getElementById('table1');↩
var tb = doc.createElement('tfoot');↩
var tr = doc.createElement('tr');↩
tb.appendChild(tr);↩
t1.appendChild(tb);↩
var tb = doc.createElement('tfoot');↩
var tr = doc.createElement('tr');↩
tb.appendChild(tr);↩
t1.appendChild(tb);↩
var tb = doc.createElement('tfoot');↩
var td = doc.createElement('td');↩
tr.appendChild(td); ↩
tb.appendChild(tr);↩
t1.insertBefore(tb, doc.getElementById("colg1"));↩
tr.remove();↩
}↩
</script>↩
</head>↩
<body onload="doit()">↩
<table id="table1"><tbody id="tbody1"><tr id="tr1"><td id="td1">x</td></tr></tbody><colgroup id ="colg1"></table>↩
</body>↩
</html>↩