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

[jama]

On 06.11.2012 00:42, Michael[tm] Smith wrote:
> Ah -- please try renaming the filename with a .xhtml extension instead 
> of .html 

Thanks! This seems to work reliably now for me!

I suggest that you change the heuristics of the validator, though. 
Wouldn't it be more logical that it checks against XHTML5 if I choose 
the XHTML5 preset, regardless whether the file extension is .html or .xhtml?