Extremely Early CSS?

Hi:

I cross-posted to many groups and set follow-ups to even more groups.
I know this is frowned-upon but I only did this with relevant groups
after going a Google-Groups search and sorting by relevance. I
apologize profusely to those who are annoyed by my cross-posting and
follow-ups.

What was the earliest version of CSS [Cascading Style Sheets]?

What type of CSS was used in 1990? In the 80s? Before?

What CSS was used -- if at all -- with Windows 3.0*? With DOS? With
Apple II?

*When I say Windows 3.0, I mean exactly Windows 3.0. Not Windows 3.0a.

Please note that these are not homework questions but questions out of
my own interest in CSS, computer history, web design, and internet
history.

No offense but please respond with reasonable answers & keep out the
jokes, off-topic nonsense, taunts, insults, and trivializations. I am
really interested in this.


Thanks for your assistance,

Radium