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Re:Grid Style Sheets – CSS polyfills from the future by d4tocchini on Thursday March 06, 2014 @10:35AM (#7354267)
Yeah, common in the Constraint-based, or Logic, Programming paradigm. This particular spec was established in Greg Badros & Alan Borning's Constraint CSS (CCSS):

https://www.cs.washington.edu/research/constraints/web/ccss-...

Re:Grid Style Sheets – CSS polyfills from the future by lewispollard on Thursday March 06, 2014 @10:48AM (#7354382)
Interesting, thanks.