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Re:CSS Variables published as First Public Working Draft by mrigor on Wednesday April 11, 2012 @05:18PM (#3829704)
Re:CSS Variables published as First Public Working Draft by gavinlynch on Wednesday April 11, 2012 @05:26PM (#3829746)
for posterity's sake, here is the Working Draft version, to go along with the above posted Editor's Draft link:

http://www.w3.org/TR/2012/WD-css-variables-20120410/