anchor.diff:    parent.querySelectorAll("span").style.display = 'none';
     parent.querySelectorAll("input").style.display = 'inline';
     (parent.querySelector("input." + target.className) as InputElement).select();
  -
  -
   }
   
   void onDimensionInputBlur(MouseEvent e) {
  
positive.code: HtmlElement container;
  HtmlElement draggedElement;
  num previewCounter = 0;
  
  void main() {
    container = querySelector('#container');
  
negative.code: 
    updatePreviewSize(div);
  
    registerEvents(div);
  }
  
  void registerEvents(DivElement div) {
    var spans = div.querySelectorAll("form span");
    for (HtmlElement span in spans) {
      span.onClick.listen(onDimensionLabelClick);
  