Untitled

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <title>Marvel</title>
</head>

<body>
  <div id="app"></div>
  <script src="node_modules/react/dist/react.js"></script>
  <script src="node_modules/react-dom/dist/react-dom.js"></script>
  <script>
    var topBar = function () {
      return React.createElement('div', null,
        React.createElement('hi', null, "Marvel Superheroes")
      );
    };
    ReactDOM.render(React.createElement(topBar), document.getElementById('app'));
  </script>

</body>

</html>