This is the React boilerplate code published at React Getting Started Docs as of August 13, 2016.
Built with blockbuilder.org
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<html>
<head>
<meta charset="UTF-8" />
<title>Hello React!</title>
<script src="https://npmcdn.com/react@15.3.0/dist/react.min.js"></script>
<script src="https://npmcdn.com/react-dom@15.3.0/dist/react-dom.min.js"></script>
<script src="https://npmcdn.com/babel-core@5.8.38/browser.min.js"></script>
</head>
<body>
<div id="example"></div>
<script type="text/babel">
ReactDOM.render(
<h1>Hello, world!</h1>,
document.getElementById('example')
);
</script>
</body>
</html>
https://npmcdn.com/react@15.3.0/dist/react.min.js
https://npmcdn.com/react-dom@15.3.0/dist/react-dom.min.js
https://npmcdn.com/babel-core@5.8.38/browser.min.js