//= require modernizr

Allan Lei https://github.com/allanlei

Check adapted from https://github.com/brandonaaron/jquery-cssHooks/blob/master/bgpos.js

Test: http://jsfiddle.net/allanlei/R8AYS/

Modernizr.addTest('bgpositionxy', function() {

return Modernizr.testStyles('#modernizr {background-position: 3px 5px;}', function(elem) {
    var cssStyleDeclaration = window.getComputedStyle ? getComputedStyle(elem, null) : elem.currentStyle;
    var xSupport = (cssStyleDeclaration.backgroundPositionX == '3px') || (cssStyleDeclaration['background-position-x'] == '3px');
    var ySupport = (cssStyleDeclaration.backgroundPositionY == '5px') || (cssStyleDeclaration['background-position-y'] == '5px');
    return xSupport && ySupport;
});

});