docs: function () {
              var thumbs = [this._firstSlider, this._secondSlider];
              for (var i = 0, len = thumbs.length; i < len; i++) {
                  this._draggable[i] = new ariaUtilsDragdropDrag(thumbs[i], {
                      handle : thumbs[i],
                      proxy : null,
                      axis : "x",
                      constrainTo : this._domElt
                  });
                  this._draggable[i].$on({
                      "dragstart" : {
                          fn : this._onDragStart,
                          scope : this
                      },
                      "move" : {
                          fn : this._onDragMove,
                          scope : this
                      },
                      "dragend" : {
                          fn : this._onDragEnd,
                          scope : this
                      }
                  });
              }
          }