docs: function () {
          return $(this).bind ('touchstart', function preventZoom (e) {
              var t2 = e.timeStamp
              var t1 = $(this).data ('lastTouch') || t2
              var dt = t2 - t1
              var fingers = e.originalEvent.touches.length
              $(this).data ('lastTouch', t2)
              if (!dt || dt > 500 || fingers > 1) {
                  return } // not double-tap
              e.preventDefault ()                     // double tap - prevent the zoom
              $(e.target).trigger ('click') }) }