 === 'none') {
          prevent = true;
        } else if (ta === 'pan-x') {
          prevent = dy > dx;
        } else if (ta === 'pan-y') {
          prevent = dx > dy;
        }
        if (prevent) {
          ev.preventDefault();
        } else {
          Gestures.prevent('track');
        }
      }
    },

    /**
     * Adds an event listener to a node for the given gesture type.
     *
     * @memberof Polymer.Gestures
     * @param {Node} node Node to add listener on
     * @param {string} evTyp