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 Hello extends React.Component {
  handleFocus(event) {
    event.target.select();
  }

  render() {
    return (
      <input type='text' value='Some something' disabled onFocus={this.handleFocus} />
    );
  }
}

ReactDOM.render(
  <Hello name="World" />,
  document.getElementById('container')
);