[html5] validator.nu Web GUI -- How to validate against XHTML5?

[jama]

On 05.11.2012 20:52, Ian Hickson wrote:
> What page are you trying to validate? 
Just two example files:

The HTML5 file I used: http://pastebin.com/DBUPg8Sp
The XHTML5 file I used: http://pastebin.com/aNANwehY

When checking against XHTML5, the HTML5 file obviously shouldn't 
validate. I've included

xmlns="http://www.w3.org/1999/xhtml"

to make sure of that.