//= require modernizr
https://developer.mozilla.org/en/CSS/background-position http://www.w3.org/TR/css3-background/#background-position Example: http://jsfiddle.net/Blink/bBXvt/
(function() {
var elem = document.createElement('a'), eStyle = elem.style, val = "right 10px bottom 10px"; Modernizr.addTest('bgpositionfourvalues', function(){ eStyle.cssText = "background-position: " + val + ";"; return (eStyle.backgroundPosition === val); });
}());