React Base Fiddle (JSX)

Starting point for creating JSFiddles with React.

HTML

<script src="https://unpkg.com/react@16/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
<div id="container">
    <!-- This element's contents will be replaced with your component. -->
</div>

Babel + JSX

class Content extends React.Component {

  static getValue(key) {
    return key
  }

  render() {
    let value = this.constructor.getValue(this.props.valueKey);
    return <span>{value}</span>
  }
}

ReactDOM.render(
  <Content valueKey={"constructor works"}/>,
  document.getElementById('container')
);