TAG:  sub
<sub> ... </sub>
 
The sub tag is used to insert subscript into a text. This allows the correct display of chemical equations, footnotes, math formulas, and scientific notation on a web page.
 
Most browsers reduce the text size by half for the subscript (and superscript), but use the same font face as used for the rest of the text. However, you can use style sheets and the style attribute to effect the appearance of the text to suit your desires.
 
The similar sup tag is used to create superscripts.
 
The separate closing tag is mandatory.
 
Attributes and Events
 
class    dir    id    lang    onclick    ondblclick    onkeydown    onkeypress    onkeyup    onmousedown    onmousemove    onmouseout    onmouseover    onmouseup    style    title
 
Code:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "DTD/xhtml-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="eng">
<head>
<title>DevGuru XHTML sub Tag Example</title>
</head>
<body>
2H<sub style="color:green;">2</sub>+O<sub style="color:green>2</sub> -> 2H<sub style="color:green;">2</sub>O
</body>
</html>
 
Output:
2H2+O2 -> 2H2O
 

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