JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="ja">
  <head>
    <meta charset="UTF-8">
    <title>Sample Code</title>
    <link rel="stylesheet" href="css\styles.css">
  </head>
    <body>
      <input type="button" value="リストCを追加" id="btn1">
      <ul id="lists">
        <li>リストA</li>
        <li>リストB</li>
      </ul>
      <script src="https://code.jquery.com/jquery-3.6.0.js" integrity="sha256-H+K7U5CnXl1h5ywQfKtSj8PCmoN9aaq30gDh27Xc0jk=" crossorigin="anonymous"></script>
      <script src="js\main.js"></script>
    </body>
</html>

JavaScript

$(function() {
  $("#btn1").on("click", function() {
    $("#lists").append("<li>リストC</li>");
  });
});