Edit in JSFiddle

    var ui =
      React.createElement('div', {}, 
        React.createElement('h1', {}, "Contacts"),
        React.createElement('ul', {},
          React.createElement('li', {},
            React.createElement('h2', {}, "James Nelson"),
            React.createElement('a', {href: 'mailto:james@jamesknelson.com'}, 'james@jamesknelson.com')
          ),
          React.createElement('li', {},
            React.createElement('h2', {}, "Joe Citizen"),
            React.createElement('a', {href: 'mailto:joe@example.com'}, 'joe@example.com')
          )
        )
      )

    ReactDOM.render(ui, document.getElementById('react-app'))
<div id="react-app"></div>
<script src="https://cdn.jsdelivr.net/react/0.14.0-rc1/react.js"></script>
<script src="https://cdn.jsdelivr.net/react/0.14.0-rc1/react-dom.js"></script>