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

[jama]

On 05.11.2012 22:26, Michael[tm] Smith wrote:
> Yeah as I mentioned in my other reply I think the only way you'll be able
> to do what it sounds like you want to do is by checking the "Be lax about
> HTTP Content-Type" option and choosing the XML option from the Parser
> select and also the XHTML5 option from the Preset select.

Mike, I'll ask differently: How do I have to modify the html file so 
that XHTML5 will be detected automatically?

Also, I did what you said (see [1]) and I got the same info boxes about 
HTML5 again... Not sure what I'm doing wrong.

[1] http://i.imgur.com/iUTc3.png