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Test Info:

<html class="reftest-wait">
<head>
<script>
function boom()
{
var a = document.getElementById("a");
var b = document.getElementById("b");
var x = document.getElementById("x");
a.parentNode.insertBefore(x, a);
x.remove();
b.remove();
document.documentElement.removeAttribute("class");
}
</script>
</head>
<body onload="setTimeout(boom, 30);">
<table>
<tr>
<td id="x">X</td>
</tr>
</table>
<table border="1" style="border-collapse: collapse;">
<tr>
<td id="a">A</td>
</tr>
<tr>
<td id="b" colspan="2">B</td>
</tr>
</table>
</body>
</html>