paulirish/html5-boilerplate — pull request #815 by MarkBennett (2011-10-17 16:09:09+00:00)
Title: Add .mobile-only and .mobile-hide classes from Columnal

Columnal, http://www.columnal.com/, is "a responsive CSS grid system helping desktop and mobile browsers play nicely together."

It includes some .mobile-only and .mobile-hide classes which might be useful in H5BP. Here they are!