<!DOCTYPE html>
<html lang="en">
<title>Test React</title>
<script src= "https://unpkg.com/react@16/umd/react.production.min.js"></script>
<script src= "https://unpkg.com/react-dom@16/umd/react-dom.production.min.js"></script>
<script src="https://unpkg.com/babel-standalone@6.15.0/babel.min.js"></script>
<body>
<div id="root"></div>
<script type="text/babel">
function tick() {
const element = (<h1>{new Date().toLocaleTimeString()}</h1>);
ReactDOM.render(element, document.getElementById('root'));
}
setInterval(tick, 1000);
</script>
</body>
</html>