1. 格式
strong元素:表示重要的内容,加粗效果
b元素:单纯是变粗下效果
em元素:强调,倾斜效果
i元素:仅倾斜效果
del元素:删除线
ins元素:插入
s元素:表示不正确
u元素:下划线,
mark元素:表标记文本的作用
sup元素、sub元素:表化学方程式之类
small元素:字变小
<b>This text is bold</b>
<br>
<strong>This text is strong</strong>
<br>
<big>This text is big</big>
<br>
<em>This text is emphasized</em>
<br>
<i>This text is italic</i>
<br>
<small>This text is small</small>
<br>
This text contains
<sub>subscript</sub>
<br>
This text contains
<sup>superscript</sup>
<br>
This text contains
<s>contains</s>
<br>
This text contains
<del>This text is incorrect</del>
<br>
This text contains
<ins>hhhhhhhh</ins>
<br>
This <u>text</u> contains