[danielnelson]

since it was introduced to the Internet in early 1990, HTML has evolved continuously.*Some features have been introduced in the specification, while others have been introduced in the software release.*In some ways, the implementation, author of practice with each other, but converge to the specifications and standards, in other ways, they continue to diverge.HTML4 became a W3C Recommendation in 1997.*It is a critical mass of content while continuing to serve as a rough guide too many of the core functionality of HTML, has been deployed it, but more importantly, provide enough information to build and implement interoperability*does not.*The same is to define the XML serialization for HTML4.*Define the JavaScript API for both XHTML and HTML, to go for, and of 2 HTML DOM Level XHTML1.