docs: function (position) {
              var size = {
                  'height' : 0,
                  'width' : 0
              };
  
              position = {
                  'top' : position.top,
                  'bottom' : position.bottom,
                  'left' : position.left,
                  'right' : position.right
              };
  
              this.reference = null;
              this.referencePosition = position;
              this.referenceSize = size;
          }