JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://unpkg.com/prop-types@15.5.10/prop-types.js"></script>
<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"></div>

Babel + JSX

class App extends React.Component {
  render() {
  	return (
			<select defaultValue={['6', '7', '8', '9']} style={{width: '200px', height: '200px'}} multiple>
        <option disabled>hello</option>
        <option>1</option>
        <option>2</option>
        <option>3</option>
        <option>4</option>
        <option>5</option>
        <option>6</option>
        <option>7</option>
        <option>8</option>
      </select>
    )
  }
}

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