This usually means that the user mixed up our lowercase/uppercase naming convention; see https://github.com/facebook/react/pull/3429#issuecomment-85166440.

We could add a message like

> Warning: The tag <commentBox> is unrecognized in this browser. If you meant to render a React component, start its name with an uppercase letter.

We'd check this only once per tag and only in development mode.

}
      } else if (childrenToUse != null) {
        var mountImages = this.mountChildren(
          childrenToUse,
          transaction,
          context,
        );
        ret = mountImages.join('');
      }
    }
    if (newlineEatingTags[this._tag] && ret.charAt(0) === '\n') {
      
      
      
      
      
      
      
      
      
      
      return '\n' + ret;
    } else {
      return ret;
    }
  },
  _createInitialChildren: function(transaction, props, context, lazyTree) {
    
    var innerHTML = props.dangerouslySetInnerHTML;
    if (innerHTML != null) {