can i also use this fonts on a website as css style?

Helvetica  Suggeriti da fmontpetit 

I don't know much about web design and maybe someone else will reply too, but I believe it is the default sans serif font on Macs and iPhones and other Apple device. On Windows, it'll be replaced by Arial.

I'm also pretty sure you can force Helvetica by using it as a Web font.