Detect multiple backgrounds (inspired by Modernizr) using data: URI so no HTTP requests made

gistfile1.js

var url = "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==";
var div = document.createElement('div');
div.style.background = "url(" + url + "),url(" + url + "), black url(" + url + ")";
if(!div.style.backgroundImage || div.style.backgroundImage.match(/url/g).length != 3){
	document.documentElement.className += " no-multiplebgs"
}