ResponsiveImagesCG/picture-element — pull request #144 by zcorpan (2014-04-10 10:48:30+00:00)
Title: Remove support for % in sizes since it's confusing if it refers to the i...

...mage or containing block or viewport. (ack johns)

http://ircbot.responsiveimages.org/bot/log/respimg/2014-04-09#T63922 onward