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XHTML is case sensitive (same as HTML), whereas HTML5 is not. Both XHTML and HTML have a more complex doctype than HTML5. (Note: doctype tells browsers how to interpret the data.) HTML5 is compatible with all browsers.
While XHTML was designed to be a better version of HTML4 by incorporating some features of XML, HTML5 turned out to be far better than the both and is by far the most widely used markup language today because of the addition of many essential features.
XHTML is not compatible with the IE8 and other older versions of the browsers. HTML5 is capable of using XHTML style tags but not vice versa.
XHTML5 is a document that conforms to both the HTML and XHTML syntax by using a common subset of both the HTML and XHTML. To code XHTML5 you need to: Use the HTML5 doctype. Code in XHTML well-formed syntax.
What differences are expected of XHTML5 versus HTML5?
The HTML5 "doctype" is not used. The xmlns attribute is required.
I understand that XHTML5 is the XML form of the language and HTML5 is the SGML form of the language
No. HTML5 is not SGML based.
, which means obvious minor syntax differences.
No. Just some forms of syntax become forbidden.
Will XHTML5 deprecate completely worthless elements that were not deprecated by HTML5?
No. They are just different serialisations.
Will XHTML5 be written in schema instead of doctype?
There are, as far as I'm aware, no plans to have an official schema (or DTD for that matter: the doctype is "A thing to trigger standards mode in browsers" and nothing more).
Will XHTML5 impose structural validations instead of merely stating what is a child of what?
No differences from HTML5.
Will XHTML5 offer accessibility advantages that not available in HTML5?
No.
Will XHTML5 offer any security enhancements?
No.
http://wiki.whatwg.org/wiki/HTML_vs._XHTML is an attempt to document the differences between HTML5 and XHTML5. As far as I know it is the best available resource on this subject to date.
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