The “address” tag is for contact info of the article author or page's owner. Use it like this:
<address> Contact <a href="../mary_lee.html">Mary Lee</a>. </address>
The “address” tag can contain email or street address. For example:
<address> Write to Mary at <a href="mailto:email@example.com">firstname.lastname@example.org</a>. </address>
The main thing is that it marks up a contact info of the article. There's no strict structure of what content inside “address” tag should be. Also, the “address” tag is often conveniently placed inside “header” or “footer” tags. 〔➤ HTML5 Page Article Tag and Page Structure Tags〕
Note: the “address” tag should NOT be used for arbitrary address that has nothing to do with the author or page owner.
Here's how your browser renders it:Contact Xah Lee.
Back to HTML5 Tags Complete List.