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 KeySample = React.createClass({
  getInitialState: function() {
    return {
      list: [1,2,3,4,5]
    };
  },
  add: function() {
    this.setState({ list: [0].concat(this.state.list) });
  },
  render: function() {
    var list = this.state.list.map(function(i) { return <li key={i}>{i}</li> });
    return (
      <div>
        <ul>{list}</ul>
        <div>dasda</div>
        <button onClick={this.add}>add</button>
      </div>
    );
  }
});

React.render(<KeySample />, document.body);