score:3

Accepted answer 
<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8"/>
        <script src="https://npmcdn.com/babel-core@5.8.38/browser.min.js"></script>
        <script src="https://npmcdn.com/react@15.3.1/dist/react.min.js"></script>
        <script src="https://npmcdn.com/react-dom@15.3.1/dist/react-dom.min.js"></script>
    </head>
    <body>
        <div id="app"></div>
        <script type="text/babel">
            ReactDOM.render(
                <h1>Hello React!</h1>,
                document.getElementById('app')
            );
        </script>
    </body>
</html>

score:2 

https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.23/browser.js
https://cdnjs.cloudflare.com/ajax/libs/react/0.14.7/react.js
https://cdnjs.cloudflare.com/ajax/libs/react/0.14.7/react-dom.js

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