Scusate, ho provato a validare il sito caricando l'index sul server del w3c. Esce questo:

I was not able to extract a character encoding labeling from any of the valid sources for such information. Without encoding information it is impossible to reliably validate the document. I'm falling back to the "UTF-8" encoding and will attempt to perform the validation, but this is likely to fail for all non-trivial documents.

Che vuol dire???