HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>createNodeIterator combine</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} #panel{border:1px solid #ccc;padding:0.75rem;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <div id="panel">
    <!-- note -->
    <span>Inside</span>
  </div>
  <button id="btn" type="button">Walk elements + comments</button>
  <pre id="out">Click the button</pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var root = document.getElementById("panel");
      var mask = NodeFilter.SHOW_ELEMENT | NodeFilter.SHOW_COMMENT;
      var it = document.createNodeIterator(root, mask);
      var kinds = [];
      var node;
      while ((node = it.nextNode())) {
        kinds.push(node.nodeType === Node.COMMENT_NODE ? "comment" : node.nodeName);
      }
      document.getElementById("out").textContent = JSON.stringify(kinds);
    });
  </script>
</body>
</html>

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Document.createNodeIterator — combined flags (Try It)