"Learning React" book Chapter 2, coding did not work

programming web dev
1

Hello Kirupa,
I am through this book, trying to learn REACT, as a beginner.
THis code below did not work for me. It did not display any text when I loaded them on a webpage.

<DOCTYPE html>
    <html>
<head>
    <meta charset="utf-8">
    <title> React1</title>
    <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>
    <script>src="https://unpkg.com/babel-standalone@6.15.0/babel.min.js"</script>

    <style>
        #container {
            padding: 50px;
            background-color: #EEE;

        }
        #container h1 {
            font-size: 144px;
            font-family:sans-serif;
            color: #0080A9;
        }
    </style>

</head>
<body>
    <div id="container"></div>
    <script type="text/babel">
	 var destination = document.querySelector("#container");
    ReactDOM.render(React.createElement(
        "h1",
        null,
        "Batman"), destination);

     </script>

</body>
</html>

</DOCTYPE>

I got some help stackoverlow.com and found that the following code works.

<DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title> React1</title>
    <style>
        #container {
            padding: 50px;
            background-color: #EEE;

        }
        #container h1 {
            font-size: 144px;
            font-family:sans-serif;
            color: #0080A9;
        }
    </style>
  </head>
  <body>
    <div id="container"></div>

    <script src="https://unpkg.com/react@15/dist/react.min.js"></script>
    <script src="https://unpkg.com/react-dom@15/dist/react-dom.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.24/browser.min.js"></script>
    <script type="text/babel">
      var destination = document.querySelector("#container");
    ReactDOM.render(React.createElement(
        "h1",
        null,
        "Batman"), destination);
    </script>

  </body>
</html>

Please provide some clarification on the working code.
Thanks
Ram