Though its role is quite simple, the
address element seems to be easily forgotten, or even misunderstood – it is named somewhat misleadingly. In short, you should use it to indicate the contact info for a web page, like an email or website address.
The spec is crisp about it:
address element represents the contact information for its nearest
body element ancestor. If that is the
body element, then the contact information applies to the document as a whole.
(For example, I wrapped the “contact me” link on my homepage in it.)
Have a look at the
address element in the HTML standard, it’s a short read.
Important note: Don’t use the
address element for marking up addresses in general, such as postal addresses (unless they represent the actual contact, of course). For that purpose, use the adr format, a property of the hCard microformat.