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 Child extends React.Component {

/* Uncomment to avoid rerenders!
  shouldComponentUpdate() {
    return false;
  } 
*/

  render() {
  	alert('render');
    return <div>Child</div>;
  }
}

class Parent extends React.Component {
  render() {
    return <Child />;
  }
}

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

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