检签 sub sup应用
<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>superscript</sup>
</body>
</html>