This seems pretty similar in IE5.5 and Moz Firefox 1.0:
Code:
<html>
<head>
</head>
<body bgcolor="#EEFFEE">
<style>
<!--
table, td {
border: 1px solid #000;
border-collapse: collapse;
}
//-->
</style>
<table width="25%" border="0">
<tbody><tr>
<th width="50">a</th>
<th width="80">b</th>
</tr>
<tr>
<td width="50">1</td>
<td width="80">2</td>
</tr>
<tr>
<td width="50">3</td>
<td width="80">4</td>
</tr>
</tbody>
</table>
</div>
</body></html>