he native events
     *
     * @private
     * @param {HTMLElement} node Node on which to add the event.
     * @param {string} evType Event type to add.
     * @param {function} handler Event handler function.
     */
    _add: function(node, evType, handler) {
      let recognizer = this.gestures[evType];
      let deps = recognizer.deps;
      let name = recognizer.name;
      let gobj = node[GESTURE_KEY];
      if (!gobj) {
        node[GESTURE_KEY] = gobj = {};
      }
      for (let i = 0, dep, gd; i 