<div id="root">
  <!-- This div's content will be managed by React. -->
</div>
ReactDOM.render(
  <h1>Hello, world!</h1>,
  document.getElementById('root')
);
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External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

  1. https://unpkg.com/react/umd/react.development.js
  2. https://unpkg.com/react-dom/umd/react-dom.development.js