HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>nodeName vs tagName</title>
</head>
<body>
  <div id="d1">Hello</div>
  <pre id="out"></pre>
  <script>
    var el = document.getElementById("d1");
    var text = el.firstChild;
    document.getElementById("out").textContent =
      el.nodeName + "\n" +
      el.tagName + "\n" +
      text.nodeName;
  </script>
</body>
</html>

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Node.nodeName — vs tagName (Try It)