一、段落,换行,空白行
<html>
<body>
<! --注释-->
<p>hr 标签定<br />义水平线:</p>
<hr />
<p>这是段落。</p>
</body>
</html>

- 段落<p>
- 换行<br />
- 分割线<hr />
- 注释<! --com-->
二、加粗,强调,大号,斜体,小号,上下标文本
<html>
<body>
<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>su