<html>
<head>
<style type="text/css">
table { width: 40em; }
th { width: 10em; margin: 1em; }
td { width: 6em; margin: 1em; }
table { border: medium solid red; }
td { border: thin solid blue; }
</style>
</head>
<body>
<table>
<caption>This is a simple 3x3 table</caption>
<tr id="row1">
<th>Header 1 </th>
<td colspan='2'>Cell 1 </td>
<td>Cell 2</td>
</tr>
<tr id="row2">
<th>Header 2 </th>
<td rowspan='2'>Cell 3 </td>
<td colspan='2'>Cell 4</td>
</tr>
<tr id="row3">
<th>Header 3 </th>
<td>Cell 5 </td>
<td>Cell 6 </td>
</tr>
</table>
</body>
</html>