জাভাস্ক্রিপ্ট createTreeWalker

<!DOCTYPE html>
<html>
<body>

<div id="source">
  <p>এইচটিএমএল</p>
  <p>সিএসএস</p>
</div>

<button onclick="execute()">ফলাফল</button>

<p id="result"></p>

<script>
function execute() {
  const walker = document.createTreeWalker(
    source,
    NodeFilter.SHOW_ELEMENT
  );

  let node;
  let names = [];

  while (node = walker.nextNode()) {
    names.push(node.nodeName);
  }

  result.textContent = names.join(", ");
}
</script>

</body>
</html>