HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>createDocumentFragment MDN</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} ul{border:1px solid #ccc;padding:0.5rem 1.5rem;}</style>
</head>
<body>
  <ul id="ul"></ul>
  <button id="btn">Run MDN example</button>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var element = document.getElementById("ul");
      var fragment = document.createDocumentFragment();
      var browsers = ["Firefox", "Chrome", "Opera", "Safari"];
      browsers.forEach(function (browser) {
        var li = document.createElement("li");
        li.textContent = browser;
        fragment.appendChild(li);
      });
      element.appendChild(fragment);
    });
  </script>
</body>
</html>

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Document.createDocumentFragment — MDN browser list (Try It)