21. Table Heads
22. Naming your table(合併表格)
<html>
<head>
<title>Table Time</title>
</head>
<body>
<table border="1px">
<thead>
<tr>
<th colspan="2">Famous Monsters by Birth Year</th>
</tr>
<tr>
<th>Famous Monster</th>
<th>Birth Year</th>
</tr>
</thead>
<tbody>
<tr>
<td>King Kong</td>
<td>1933</td>
</tr>
<tr>
<td>Dracula</td>
<td>1897</td>
</tr>
<tr>
<td>Bride of Frankenstein</td>
<td>1935</td>
</tr>
</tbody>
</table>
</body>
</html>