New tutorial: Declaring Language in XHTML and HTML

Information about the language in use on a page is important for accessibility, styling, searching, and other reasons. In addition, language information that is typically transmitted between the user agent and server can be used to help improve navigation for users and the localizability of your site. This tutorial will help you take advantage of the opportunities that are available now and in the near future by declaring language information appropriately.
By following this tutorial you should be able to:

• recognize the available alternatives for declaring language, and how they differ,
• understand the difference between metadata about the expected language of the audience and the text-processing language,
• choose the best way of declaring language for your content
• locate information about how to specify language attribute values.