Add CSS variable to browser
Add CSS variable to browser

Documentation at
https://developer.mozilla.org/en-US/docs/Web/API/CSS

Specified at
http://dev.w3.org/csswg/css-conditional/#the-css-interface
http://dev.w3.org/csswg/cssom/#the-css.escape%28%29-method

jagdeesh109/jshint,elkingtonmcb/jshint,stevemao/jshint,kidaa/jshint,Jeremy017/jshint,marian-r/jshint,gameclosure/jsiohint,crivas/jshint,yadimon/jshint,thomas658/jshint,lovemeblender/jshint,paladox/jshint,yadimon/jshint,lukeapage/jshint,meh-uk/jshint,cnbin/jshint,thomas658/jshint,laurensortiz/jshint,Endika/jshint,max789/jshint,Jeremy017/jshint,silverwind/jshint,BridgeAR/jshint,wisavalite/jshint,gloryknight/jshint,shreyasgaonkar/jshint,pansay/jshint,wzup/jshint,jagdeesh109/jshint,jugglinmike/jshint,crivas/jshint,davidjb/jshint,alivesay/jshint,llucbrell/jshint,louwers/jshint,max789/jshint,davidjb/jshint,paragag/AntiRedis,behind2/jshint,ljharb/jshint,mcanthony/jshint,AndriiGro/jshint,niedzielski/jshint,zynick/jshint,mcanthony/jshint,Endika/jshint,supriyantomaftuh/jshint,nitinlal/jshint,luisbrito/jshint,luisbrito/jshint,supriyantomaftuh/jshint,wzup/jshint,freeyiyi1993/jshint,nicolo-ribaudo/jshint,mrjoelkemp/jshint,Joy603/jshint,beni55/jshint,paul-wade/jshint,gtanner/jshint,scottsmeester/jshint,ThiagoGarciaAlves/jshint,jshint/jshint,niedzielski/jshint,kidaa/jshint,jshint/jshint,jonnyreeves/jshint,louwers/jshint,AndriiGro/jshint,mrjoelkemp/jshint,jugglinmike/jshint,yyx990803/jshint,beni55/jshint,n8io/jshint,mohsen1/jshint,stevemao/jshint,scottsmeester/jshint,fashionsun/jshint,paul-wade/jshint,nicolo-ribaudo/jshint,behind2/jshint,gtanner/jshint,nitinlal/jshint,ljharb/jshint,elkingtonmcb/jshint,lukeapage/jshint,shreyasgaonkar/jshint,llucbrell/jshint,mohsen1/jshint,aisk/jshint,Joy603/jshint,fashionsun/jshint,pansay/jshint,wisavalite/jshint,marian-r/jshint,laurensortiz/jshint,darongE/jshint,cnbin/jshint,n8io/jshint,doggy8088/jshint,freeyiyi1993/jshint,aisk/jshint,BridgeAR/jshint,alivesay/jshint,doggy8088/jshint