/Html/Need help not working (https://unpkg.com/react@17/umd/react.development.js)

Need help not working (https://unpkg.com/react@17/umd/react.development.js)

<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>

Source: reactjs.org

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