React Base Fiddle (JSX)

Starting point for creating JSFiddles with React. This uses React with Addons.

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.24/browser.js"></script>
<script src="https://npmcdn.com/react@latest/dist/react-with-addons.js"></script>
<script src="https://npmcdn.com/react-dom@latest/dist/react-dom.js"></script>
<script src="https://facebook.github.io/react/js/jsfiddle-integration-babel.js"></script>
<script src="https://npmcdn.com/style-it@latest/dist/style-it-standalone.js"></script>

<div id="container">
    <!-- This element's contents will be replaced with your component. -->
</div>

JavaScript 1.7

class Intro extends React.Component {
  render() {
    return Style.it(`
      .emoji {
        font-size: 20px;
        height: 40px;
        width: 40px;
        border-radius: 40px;
        text-align: center;
      }
      .emoji:active:before {
      	opacity: .7;
      }
      .emoji:before {
        content: "\\01F431";
      }
    `,
      <button className="emoji" />
    );
  }
}

ReactDOM.render(
  <Intro />,
  document.getElementById('container')
);