What Is XHTML?

The simplest definition of XHTML is nothing more than the following:

XHTML is HTML written according to XML rules.

Because you've gotten this far in the book, you have a good idea as to what XML is and how you can use it. In this chapter, we'll look at what impact XML has had on the existing HTML language and what the peculiarities are about using them both together, including how to use XHTML modules in constructing new languages.

A Short History of XHTML

As you know, Hypertext Markup Language (HTML) is the primary language used on the Web for the construction of Web pages and sites. Originally created by Tim Berners-Lee in 1990, HTML was designed to be a simple application of Standard Generalized Markup Language (SGML) for easy ...

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