Il validatore di codice css mi ha informato con queste stringhe di codice:


Line : 9 font-family: You are encouraged to offer a generic family as a last alternative
Line : 12 font-family: You are encouraged to offer a generic family as a last alternative
Line : 13 font-family: You are encouraged to offer a generic family as a last alternative
Line : 21 font-family: You are encouraged to offer a generic family as a last alternative

eccetera.

I font che ho inserito sono:

font-family : Verdana, tahoma, Century Gothic, Geneva, Georgia;

In cosa mi "incoraggia" il validatore?


Grazie.
Purno