案例：html案例-文本格式化     状态：可编辑再运行    进入竖版
 运行结果　
​x
 
1
<html>
2
​
3
<body>
4
​
5
<b>This text is bold</b>
6
​
7
<br />
8
​
9
<strong>This text is strong</strong>
10
​
11
<br />
12
​
13
<big>This text is big</big>
14
​
15
<br />
16
​
17
<em>This text is emphasized</em>
18
​
19
<br />
20
​
21
<i>This text is italic</i>
22
​
23
<br />
24
​
25
<small>This text is small</small>
26
​
27
<br />
28
​
29
This text contains
30
<sub>subscript</sub>
31
​
32
<br />
33
​
34
This text contains
35
<sup>superscript</sup>
36
​
37
</body>
38
</html>