code: function() {
                  var dd = document.documentElement, db = document.body;
                  if (dd && (dd.scrollTop || dd.scrollLeft)) {
                      return [dd.scrollTop, dd.scrollLeft];
                  } else if (db) {
                      return [db.scrollTop, db.scrollLeft];
                  } else {
                      return [0, 0];
                  }
              }
docs: Returns the scrollTop and scrollLeft.  Used to calculate the
  pageX and pageY in Internet Explorer
  @method _getScroll
  @static
  @private