[whatwg] XHTML namespace and HTML elements

[Olli Pettay]

Hi,

I wonder what (and where) are the reasons to use XHTML namespace also 
with HTML elements.
The behavior causes few issues like
https://bugzilla.mozilla.org/show_bug.cgi?id=501312 and
http://www.w3.org/Bugs/Public/show_bug.cgi?id=6777 and
http://www.w3.org/Bugs/Public/show_bug.cgi?id=7059

And what are the problems if and when null namespace is used with HTML
elements (like in <=FF3.5).

When script libraries need to check if some element is an (X)HTML
element, they could always use instanceof.

Perhaps this has been discussed earlier in this list, but
couldn't find the relevant emails.

-Olli