title: ReactDOM does not render a simple div
body: <p>I'm trying to render a simple div on the main html file using ReactDOM render method, but the div is not rendered on the screen and there are no exceptions thrown. Am I doing it wrong?</p>
  
  <p>app.js:</p>
  
  <pre><code>import React from 'react';
  import ReactDOM from 'react-dom';
  
  ReactDOM.render(
    &lt;h1&gt; Hi! &lt;/h1&gt;, document.getElementById('root')
  );
  </code></pre>
  
  <p>index.html:</p>
  
  <pre><code>&lt;!doctype html&gt;
  &lt;html&gt;
    &lt;head&gt;
      &lt;title&gt;Example&lt;/title&gt;
    &lt;/head&gt;
    &lt;body&gt;
      &lt;h1&gt; Hello World! &lt;/h1&gt;
      &lt;div id="root"&gt;&lt;/div&gt; 
    &lt;/body&gt; 
  &lt;/html&gt;
  </code></pre>
  
  <p>The screen only shows the "Hello World!" h1 tag.</p>
  
  <p>I'm also using webpack webpack dev server and Babel.</p>