anchor.diff:        ..attributes['style'] = 'height: 30px; margin-right: 1em;';
       logoLink.append(imgRef);
       parent.insertBefore(logoLink, breadcrumbs);
  -    parent.insertBefore(new Text('\n  '), breadcrumbs);
     }
   
     void _addPubPackageLink(Element breadcrumbs, {int level = 1}) {
  
positive.code:     }
  
      head.insertBefore(link, canonical);
      head.insertBefore(new Text('\n  '), canonical);
    }
  
    void _addMetaNoIndex(Element head) {
  
negative.code:       lead.append(leadLink);
  
        breadcrumbs.insertBefore(lead, breadcrumbs.firstChild);
      }
    }
  
  