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"></div>

Babel + JSX

const DATA_FLAG = 'data-flag'

const Hello = ({ name }) => {
	const dataAttrs = { [DATA_FLAG]: true }
	return <div {...dataAttrs}>Hello {name}</div>;
  
  // or this one-line version (but I find it less readable):
  // return <div {...{ [DATA_FLAG]: true }}>Hello {name}</div>;
}

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