animation & transition event add prefix

var pfx = ["webkit", "moz", "MS", "o", ""],

function PrefixedEvent(element, type, callback) {
  element.removeEventListener(pfx[p] + type, callback, false);
  for (var p = 0; p < pfx.length; p++) {
    if (!pfx[p]) type = type.toLowerCase();
      element.addEventListener(pfx[p] + type, callback, false);
    }
}