[html5] XHTML extending. id, class, style attributes support for other namespaces

Anton Vitr anton.vitr at yandex.ua
Thu Oct 18 14:41:02 PDT 2012

Thank you Ian!

> It sounds like the simplest way to achieve what you want to do is invent a
> new language that's a superset of HTML. So your documents wouldn't have to
> be HTML-compliant. Simplest way to do this is probably just to use your
> own namespace in XML.
Did you mean XML, and not XHML? 

> Such documents wouldn't be conforming HTML, and wouldn't work if your
> library wasn't available for whatever reason.
Google return me a lot results for "XHTML extending", including spec - http://www.w3.org/TR/1999/xhtml-modularization-19990406/extending.html
But, XHTML is too strict and do not widely used.

Is there any plans to include some king of extending in HTML5 (not XHTML)? Or my case(problem) is very rare, and is no point  to encourage people to extent HTML language?


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