anchor.diff:                .toString() +
             "px"
         ..top =
  -          (_domElement.offsetTop + _REPEAT_BUTTON_SIZE * 0.6).toString() + "px"
  +          (_getOffsetTop(_domElement) + _REPEAT_BUTTON_SIZE * 0.6).toString() + "px"
         ..display = "block";
     }
   
  
positive.code:                 .toString() +
              "px"
          ..top =
              (_domElement.offsetTop - _REPEAT_BUTTON_SIZE / 2).toString() + "px"
          ..display = "block";
      }
  
  
negative.code:               .toString() +
            "px"
        ..top =
            (_getOffsetTop(_domElement) - _REPEAT_BUTTON_SIZE / 2).toString() + "px"
        ..display = "block";
  
      _moveDownDomElement.style
  