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Test Info:

<html xmlns="http://www.w3.org/1999/xhtml">↩
<head>↩
<title>dom cellmap crash</title>↩
<script>↩
function doit()↩
{↩
var doc = window.document;↩
var t1= doc.getElementById('table1');
var tbA = doc.createElement('tbody');
t1.appendChild(tbA);
var trA = doc.createElement('tr');↩
var td = doc.createElement('td');↩
td.setAttribute('rowspan', 2);↩
trA.appendChild(td);
tbA.appendChild(trA);
var trB = doc.createElement('tr');
var tdB = doc.createElement('td');
tdB.setAttribute('rowspan', 2);
trB.appendChild(tdB);
tbA.appendChild(trB);
tdB.remove();
trA.remove();
trB.remove();
var tb = doc.createElement('tbody');
trB.appendChild(tdB);
tb.appendChild(trB);
t1.appendChild(tb);
}↩
</script>↩
</head>↩
<body onload="doit()">↩
<table id="table1"><tbody id="tbody1"><tr id="tr1"><td id="td1">x</td></tr></tbody></table>↩
</body>↩
</html>↩