HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>replaceChildren clear</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} ul{border:1px solid #ccc;padding:0.5rem 1.5rem;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <ul id="items">
    <li>Apple</li>
    <li>Banana</li>
    <li>Cherry</li>
  </ul>
  <button id="btn">list.replaceChildren()</button>
  <pre id="out">Click the button</pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var list = document.getElementById("items");
      var before = list.childElementCount;
      list.replaceChildren();
      var after = list.childElementCount;
      document.getElementById("out").textContent = "Before: " + before + "\nAfter: " + after;
    });
  </script>
</body>
</html>

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Document.clear — replaceChildren alternative (Try It)