XHTML5

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1 Introduction

XHTML5 is an XML variant of HTML5.

With respect to HTML5 it differs in four related ways:

  • (True) XHTML5 must be served as XML, e.g. application/xhtml+xml or application/xml. This will have the important consequence that its contents will be processed by an XML processor.
  • You may add your own XML languages within their own namespaces (cannot be done with HTML5)
  • XHTML5 is XML. Therefore, contents must be well-formed and (probably) valid.

As of March 2013, XHTML5 doesn't seem to be implemented, but I'd have to check this - Daniel K. Schneider (talk) 18:33, 8 March 2013 (CET)

2 Example

XHTML5 code may look like this:

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
  <meta charset="utf-8" />
  <title>XHTML5</title>
 </head>
 <body>
  ... is preparing its comeback and it may even become stronger than before 
since after many many years IE explorer managed to implement XHTML 1...
 </body>
</html>
  • Notice the namespace declaration

3 Links

3.1 Manuals and Specs

  • HTML vs XHTML (Section of the W3C HTML Living Standard HTML5 page).

3.2 Tutorials

  • Thinking XML: The XML flavor of HTML5, 6 recommendations for developers using the next generation of the web's native language, IBM Developer works 2010. Basically it tells how to use XHTML5 in the same way that XHTML was used, i.e. just served as HTML....