How to define multiple elements inside JSX ?

Answer:

The Render method of ReactDOM returns a single node. We need to wrap the multiple child elements inside a parent element say DIV and retur a single node to the Render method. e.g.

<script type="text/babel">

      ReactDOM.render(

        <div> 

          <h1>Message from RNA Team - "Welcome to ReactJS World"</h1>

          <b>Bold this text</b>

         </div>,

        document.getElementById('mainContainer')

      );

</script>