Hidde de Vries gathers some of the early thinking about CSS:
There is quite a bit of information on the web about how CSS was designed. Keeping it simple was a core principle. It continued to be — from the early days and the first implementations in the late nineties until current developments now.
The four main design principles listed are fascinating:
So… did it?
I think lots has changed since the early nineties, but not really things that touch on how we apply CSS to structured markup.
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Did CSS get more complicated since the late nineties? is a post from CSS-Tricks