<html>
    <head>
        <link rel="stylesheet" href="index.css">
        <script crossorigin src="https://unpkg.com/react@17/umd/react.development.js"></script>
        <script crossorigin src="https://unpkg.com/react-dom@17/umd/react-dom.development.js"></script>
        <script src="https://unpkg.com/babel-standalone@6/babel.min.js"></script>
    </head>
    <body>
        <div id="root"></div>
        <script src="index.js" type="text/babel"></script>
    </body>
</html>

<html>

<head>

<script crossorigin

src="https://unpkg.com/react-dom@17/umd/react-dom.development.js"></script>

</head>

<body>

</body>

</html>

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"You are using the in-browser Babel transformer. Be sure to precompile your scripts for production - https://babeljs.io/docs/setup/"

-1:57