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

Helvetica  Suggérée par 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 iPhone^©®™s 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.