docs: function() {
          if (bound) { self.unbind(transitionEnd, cb); }
  
          if (i > 0) {
            self.each(function() {
              this.style[support.transition] = (oldTransitions[this] || null);
            });
          }
  
          if (typeof callback === 'function') { callback.apply(self); }
          if (typeof nextCall === 'function') { nextCall(); }
        }