title: I could not see any output of this react code
body: <p>1.I am new to react, I could not understand what's wrong with this code.</p>
  
  <p>2.I have HTML file where I have added a div with id "container" to it.</p>
  
  <pre><code>var HelloWorld = React.createClass({
     render: function () {
        return (
           &lt;div&gt;
              {this.props.children}
           &lt;/div&gt;
        );
     }
  });
  
  ReactDOM.render(
     &lt;div&gt;
        &lt;HelloWorld&gt;A&lt;/HelloWorld&gt;
        &lt;HelloWorld&gt;B&lt;/HelloWorld&gt;
     &lt;/div&gt;,
     document.getElementById("container")
  );
  </code></pre>