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>

CSS

.test { background: blue; }

Babel + JSX

class Hello extends React.Component {
  render() {
    var loading = true;
  	var ConditionalWrap = props => (loading ? <span className="test">{props.children}</span> : props.children);
    
    return (
    	<ConditionalWrap>Hello World</ConditionalWrap>
    );
  }
}

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