<body>
  <div id="root"></div>

  <!-- JS goes here -->
  <script src="https://unpkg.com/[email protected]^16/umd/react.development.js"></script>
  <script src="https://unpkg.com/[email protected]^16/umd/react-dom.development.js"></script>
  <script>
    const rootElt = document.getElementById('root');
    const childElt = React.createElement('div', {
      children: 'Hello World',
      className: 'container'
    });
    // childElt.textContent = 'Hello World';
    // childElt.className = 'container';
    // rootElt.appendChild(childElt);
    ReactDOM.render(childElt, rootElt);
  </script>
</body>
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