<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
table{
border-collapse: collapse;
200px;
height: 100px;
/*
collapse 边框合并，如果相邻的话，共用一个框
separate 默认值，边框分开，不合并
*/
}
</style>
</head>
<body>
<table border="1">
<thead>
<tr>
<th>class</th>
<th>name</th>
<th>age</th>
</tr>
</thead>
<tbody>
<tr>
<td>20</td>
<td colspan="2">保密</td>
<!--<td>16</td>-->
</tr>
<tr>
<td rowspan="2">21</td>
<td>郭校歌</td>
<td>16</td>
</tr>
<tr>
<!--<td>21</td>-->
<td>三花</td>
<td>18</td>
</tr>
</tbody>
</table>
</body>
