React Hello World Example with ES6+JSX

A basic Hello World widget with in browser JSX transformed + ES6 support

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.13.1/JSXTransformer.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.13.1/react-with-addons.js"></script>
<script src="https://facebook.github.io/react/js/jsfiddle-integration.js"></script>
<div id="container">
    <!-- This element's contents will be replaced with your component. -->
</div>

JavaScript 1.7

class Message extends React.Component {
    render() {
        return <div className='message'>{this.props.contents}</div>;
    }
}

React.render(
    <Message contents="Hello world!" />,
    document.getElementById('container'),
    function() {
        console.log('Callback that executes after rendering');
    }
);