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

[jama]

Hi all

(I hope I'm doing this right. First time posting on a mailing list.)

Am I doing something wrong or is it not possible to validate XHTML5 
files on [1] via the Web GUI? Whenever I choose the XHTML5 preset, the 
validator jumps back to validate against simple HTML5 instead. I tried 
file upload the file and do it via direct input. The GUI always seems to 
pick HTML5 instead.

Any suggestions?

Regards,
jama

[1] http://validator.w3.org/nu/