css variables

[Craig White]

I can't find anything in w3.org specifications on stylesheets that
suggests that I can do this but is it possible to have a 'variable' that
I could substitute within a single stylesheet?

What I am looking for is to define a color - say medblue = #466AD2

and then use &medblue; or whatever to refer to it in various
classes/id's

Possible?

-- 
Craig White <craig at tobyhouse.com>