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.

inputValueTracking.trackNode((domElement: any));
        ReactDOMFiberInput.postMountWrapper(domElement, rawProps);
        break;
      case 'textarea':
        
        
        inputValueTracking.trackNode((domElement: any));
        ReactDOMFiberTextarea.postMountWrapper(domElement, rawProps);
        break;
      case 'option':
        ReactDOMFiberOption.postMountWrapper(domElement, rawProps);
        break;
      default:
        if (typeof props.onClick === 'function') {
          
          trapClickOnNonInteractiveElement(((domElement: any): HTMLElement));
        }
        break;
    }
  },
  
  diffProperties(
    domElement: Element,
    tag: string,
    lastRawProps: Object,
    nextRawProps: Object,
    rootContainerElement: Element,
  ): null | Array<mixed> {
    if (__DEV__) {