code do not need to know, for the layout of even complex models will not fit
necessary. For example, to make a circle need to know what border-radius is set to %
In my opinion faster to make up than to find the button where to darknut.
base units no one bothers to make up a library and use it.
Well, for beginners, probably quite norms. Especially when you don't know the rules and you can petercat button and see what it affects. I so DreamWeaver typeset. Thought more convenient, is not necessary to memorize all sorts of crap :)