案例：html/html5 案例     状态：可编辑再运行    进入竖版
 运行结果　
​x
 
1
<html>
2
<body>
3
​
4
<table width="100%" border="1">
5
  <tr>
6
    <th>Month</th>
7
    <th>Savings</th>
8
  </tr>
9
  <tr>
10
    <td colspan="2">January</td>
11
  </tr>
12
  <tr>
13
    <td colspan="2">February</td>
14
  </tr>
15
</table>
16
​
17
</body>
18
</html>
19
​