anchor.diff:            'margin-bottom: 0px;'
             'margin-left: 12px;');
       if (object is StackTrace) {
  -      body.addStyle('color: rgb(196, 26, 22);');
  +      body.addStyle('background-color: thistle;color: rgb(196, 26, 22);');
       }
       var children = _simpleFormatter.children(object, config);
       if (children == null) return body.toJsonML();
  
positive.code:         nameSpan = JsonMLElement('span')
            ..createTextChild(
                child.displayName.isNotEmpty ? '${child.displayName}: ' : '')
            ..setStyle('color: rgb(136, 19, 145); margin-right: -13px');
          valueStyle = 'margin-left: 13px';
        }
  
  
negative.code:     // This is stylistically a bit ugly but it eases distinguishing Dart and
      // JS objects.
      var element = JsonMLElement('span')
        ..setStyle('background-color: #d9edf7;color: black')
        ..createTextChild(c);
      return element.toJsonML();
    }
  