Hi, I apologize for asking this silly question but i think if this will answer this will take out what bothers in my mind!....I have heard that developers or css designer before they implement their design they do this first in Photoshop and after that they implement or they will code it...now my question is how they set the dimension in Photoshop like their layouts the dimension of buttons,forms and etc...and when they code this to css they actually get what is in the design in Photoshop.

I hope you understand what i mean.

Thank you in advance