title: Can I append my component to a div's existing content in ReactJS?
body: <p>When we use <code>ReactDOM.render(&lt;Component/&gt;,document.getElementById("container"));</code> The component gets rendered to the element mentioned. What if the div here already has some existing content inside it? Can React append the rendered component to it? e.g: </p>
  
  <p>HTML: </p>
  
  <pre><code>&lt;div id = "container"&gt;Hello, React!&lt;/div&gt;
  </code></pre>
  
  <p>JSX:</p>
  
  <pre><code>var Component = React.createClass({
              render: function(){
                  return(
                      &lt;p&gt;Hello to you too!&lt;/p&gt;
                  )
              }
          })
          ReactDOM.render(&lt;Component/&gt;, document.getElementById("container"));
  </code></pre>