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4.9. Addresses

Addresses are a very common element in text documents, so there is a special tag that sets addresses apart from the rest of a document's text. While this may seem a bit extravagant -- addresses have few formatting peculiarities that would require a special tag -- it is an example of content, not format, which is the intent and purpose of HTML and XHTML markup.

By defining text that constitutes an address, the author lets the browser format that text in a different manner, as well as process that text in ways helpful to users. It also makes the content readily accessible to automated readers and extractors. For instance, an online directory might include addresses the browser collects into a separate document or table, or automated tools might extract addresses from a collection of documents to build a separate database of addresses.

4.9.1. The <address> Tag

The <address> and its required end (</address>) tag tell a browser that the enclosed text is an address. The browser may format the text in a different manner than the rest of the document text, or use the address in some special way. You also have control over the display properties through the style and class attributes for the tag (see Chapter 8, "Cascading Style Sheets").

<address>

Function:

Define an address

Attributes:

CLASS

ONKEYUP

DIR

ONMOUSEDOWN

ID

ONMOUSEMOVE

LANG

ONMOUSEOUT

ONCLICK

ONMOUSEOVER

ONDBLCLICK

ONMOUSEUP

ONKEYDOWN

STYLE

ONKEYPRESS

TITLE

End tag:

</address>; never omitted

Contains:

body_content

Used in:

address_content

The text within the <address> tag may contain any element normally found in the body of a document, excluding another <address> tag. Style changes are allowed, but may conflict with the style chosen by the browser to render the address element.

We think most, if not all, documents should have their authors' addresses included somewhere convenient to the user, usually at the end. At the very least, the address should be the author's or webmaster's email address, along with a link to their home page. Street addresses and phone numbers are optional; personal ones are usually not included for reasons of privacy.

For example, the address for the webmaster responsible for a collection of commercial web documents often appears in source documents as follows, including the special mailto: URL protocol that lets users activate the browser's email tool:

<address>
  <a href="mailto:webmaster@oreilly.com">Webmaster</a><br>
  O'Reilly & Associates, Inc.<br>
  Cambridge, Massachusetts<br>
</address>

Figure 4-25 displays the results.

Figure 4-25

Figure 4-25. The <address> tag in action

Whether it is short and sweet or long and complete, make sure every document you create has an address attached to it. If something is worth creating and putting on the Web, it is worth comment and query by your readership. Anonymous documents carry little credibility on the Web.



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