function getVendorPrefix(property) {
function up(p, a) {
return a.toUpperCase();
}
var div = document.createElement(‘div’);
var x = ‘Khtml Moz Webkit O ms ‘.split(‘ ‘), i;
for (i = x.length-1; i >= 0; i–) {
if (((x[i] ? x[i] + ‘-’ : ”) + property).replace(/-(w)/g, up) in div.style) {
  return x[i] ? ‘-’ + x[i].toLowerCase() + ‘-’ : ”; // empty string, if it works without prefix
}
}
  return null;// not found…
}