HTML 5 versus XHTML 1.0 Transitional?

Question

It seems that HTML 5 is going to be supported (partially) by Firefox 3.1 and other browsers. It is adding support for video and audio as tags, but these are new tags that XH

Answer 1

You might be looking at the problem the wrong way because the relationship to XHTML 1.x section, HTML 5 states:

"This specification is intended to replace XHTML 1.0 as the normative definition of the XML serialization of the HTML vocabulary."

Now that language is controversial (the XHTML 2 WG has disputed it and the HTML WG is trying to resolve the differences...) but that's where we stand right now.

A couple of notes:

• HTML 5 includes an XML serialization known as XHTML 5, the spec explains the differences if you're into nitty gritty details
• HTML is not SGML. Henri Sivonen has done a great write up on the history of HTML parsing
• As of this time (it has been a topic of debate several times), there won't be a DTD for HTML/XHTML 5 -- the Conformance Requirements section of the spec explains why a DTD isn't suitable for defining the HTML language. The HTML 5 validator also contains a wealth of information on this topic (including RELAX NG schemas for HTML5)