What Are HTML "sub" and "sup" Tags/Elements?

"sub" and "sup" elements are inline elements that you can use to specify text to be treated as subscript and superscript respectively. Here are basic rules about "sub" and "sup" elements:

• "sub" and "sup" elements are inline elements.
• "sub" and "sup" elements can not be used at block level.
• Contents of "sub" elements will be displayed in smaller font size, and positioned lower than normal text.
• Contents of "sup" elements will be displayed in smaller font size, and positioned higher than normal text.

Here is a good tutorial example of "sub" and sup" elements:

<?xml version="1.0" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
 <head>
  <title>SUB and SUP Elements</title>
 </head>
 <body>
  <p>The most popular algebra formula:<br/>
  <code>(a+b)<sup>2</sup> 
   = a<sup>2</sup> + 2ab + b<sup>2</sup></code></p>
  <p>The right sided derivative:<br/>
  <code>f'(x) 
   = <sub>lim(dx-&gt;0)</sub>((f(x+dx)-f(x))/dx)</code></p>
 </body>
</html>

If you save the above document as sub_and_sup.html, and view it with Internet Explorer, you will see that mathematical formulas are displayed nicely with "sub" and "sup" elements as shown below:

⇒ HTML 'del' and 'ins' Tags/Elements

⇐ HTML 'code' Tag/Element

⇑ HTML In-line Elements and Tags

⇑⇑ HTML Tutorials