docs: function scaleFix() {
          var ua = navigator.userAgent;
          if (viewportmeta && /iPhone|iPad|iPod/.test(ua) && !/Opera Mini/.test(ua)) {
              viewportmeta.setAttribute('content', 'width=device-width, minimum-scale=1.0, maximum-scale=1.0');
              document.addEventListener('gesturestart', gestureStart, false);
          }
      }