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Test Info:

<html xmlns="http://www.w3.org/1999/xhtml" class="reftest-wait">
<head>
<script>
function boom()
{
var tr2 = document.getElementById('tr2');
var newTD = document.createElement('td');
newTD.setAttribute('colspan', 2);
newTD.appendChild(document.createTextNode('x'));
tr2.insertBefore(newTD, document.getElementById('b'));
document.getElementById('a').setAttribute('colspan', 1);
document.getElementById('b').setAttribute('colspan', 3);
document.documentElement.removeAttribute("class");
}
</script>
</head>
<body onload="setTimeout(boom, 250);">
<table style="border-collapse: collapse;" border="1">
<tbody>
<tr>
<td id="a" colspan="3">A</td>
</tr>
<tr id="tr2">
<td id="b">B</td>
</tr>
<tr>
<td>C</td>
</tr>
</tbody>
</table>
</body>
</html>