Start withnreact

<!-- ... other HTML ... -->

  <!-- Load React. -->
  <!-- Note: when deploying, replace "development.js" with "production.min.js". -->
  <script src="https://unpkg.com/react@17/umd/react.development.js" crossorigin></script>
  <script src="https://unpkg.com/react-dom@17/umd/react-dom.development.js" crossorigin></script>

  <!-- Load our React component. -->
  <script src="like_button.js"></script>

</body>

Source: reactjs.org

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