<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>http://bugzilla.mozilla.org/show_bug.cgi?id=244135</title>
<style type="text/css">
table { border-collapse: collapse; }
</style>
</head>
<body>
<table border="1">
<tbody>
<tr>
    <td>text</td>
    <td>text</td>
    <td>text</td>
    <td>text</td>
</tr>
<tr>
<td rowspan="4">td rowspan=4</td>
<td>text</td>
<td>text</td>
<td>text
<script type="text/javascript">var v = document.body.offsetHeight;</script> 
</td>
</tr>
<tr>
<td>text</td>

<td>text</td>
<td>text
</td>
</tr>
<tr>
<td>text</td>
<td>text</td>
<td>text


</td>
</tr>
<tr>
<td>text</td>
<td>text</td>
<td>text
</td>
</tr>
</tbody>