XHTML (Extensible Hypertext Markup Language) is essentially the newest version of HTML--the fundamental building block for intranets and the Web. XHTML is a recasting of HTML in XML, and by using it, content developers can enter the XML world with all its benefits, while ensuring that their content is compatible with HTML. Mastering XHTML, Premium Edition is one of the most comprehensive learning tools and references available on the topic. The enclosed CD-ROM includes an easy- to-use, searchable version of the book's XHTML reference. It also features key XHTML code from the book, a huge collection of powerful Web utilities, and high-quality clip media.