From http://www.w3schools.com (Copyright Refsnes Data)

HTML <div> tag

Example

A section in a document that will be displayed in green:

<div style="color:#00FF00">
<h3>This is a header</h3>
<p>This is a paragraph.</p>
</div>

The <div> tag defines a division or a section in an HTML document.

The <div> tag is often used to group block-elements to format them with styles.

The <div> tag is supported in all major browsers.

The "align" attribute of the div element was deprecated in HTML 4.01, and is not supported in XHTML 1.0 Strict DTD.

Tip: The div element is very often used with CSS to layout a web page.

Note: Browsers usually place a line break before and after the div element.

DTD indicates in which DTD the attribute is allowed. S=Strict, T=Transitional, and F=Frameset.

Attribute	Value	Description	DTD
align	left right center justify	Deprecated. Use styles instead. How to align the text in the div element.	TF

id, class, title, style, dir, lang, xml:lang

For a full description, go to Standard Attributes.

onclick, ondblclick, onmousedown, onmouseup, onmouseover, onmousemove, onmouseout, onkeypress, onkeydown, onkeyup

For a full description, go to Event Attributes.