JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://fb.me/react-with-addons-0.12.0.js"></script>
<script src="http://fb.me/JSXTransformer-0.12.0.js"></script>
<script src="http://fb.me/react-js-fiddle-integration.js"></script>

JavaScript 1.7

var Counter = React.createClass({

    getInitialState: function() {
        return {count: 0};
    },
    
    componentDidMount: function() {
        setInterval(this.updateCount, 1000);
    },
    
    updateCount: function() {
        var nextCount = this.state.count + 1;
        this.setState({count: nextCount});
    },
    
    render: function() {
        return <div>Seconds: {this.state.count}</div>;
    }
});
 
React.render(<Counter />, document.body);