Whole website in oop & library items

lets say you have a whole website written in classes, and you have some items in the library as well (maybe some buttons, a picture for a background and so on…)

what to do with all these simbols?

leave them in the library, give them all a class name, and when the website loads access them like that, or pull them out on the stage, not neccessarily in the visible area, and not neccessarily on the first keyframe…?

I dont really know how to arrange all this…