<main></main>

var App = React.createClass({
  propTypes: {
    name: React.PropTypes.string.isRequired,
  },
  render: function render() {
    return (
      <div>
        <p>Hello {this.props.name}</p>
      </div>
    );
  }
});

ReactDOM.render(<App name="ynon" />, document.querySelector('main'));