https://twitter.com/Vjeux/status/680769537550102530

foo.html

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>React for Beginners</title>
</head>
<body>
  <div id="App"></div>

  <script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.14.3/react.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.14.3/react-dom.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.34/browser.min.js"></script>
  <script type="text/babel">
    class Foo extends React.Component {
      render() {
        return <div>{this.props.text}</div>
      }
    }

    ReactDOM.render(<Foo text="HI"/>, document.querySelector('#App'))
  </script>
</body>
</html>