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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>firstChild vs firstElementChild</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var anyNode = document.firstChild;
    var firstEl = document.firstElementChild;
    document.getElementById("out").textContent =
      "firstChild nodeType: " + (anyNode && anyNode.nodeType) + "\n" +
      "firstChild nodeName: " + (anyNode && anyNode.nodeName) + "\n" +
      "firstElementChild: " + (firstEl && firstEl.tagName);
  </script>
</body>
</html>

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firstChild vs firstElementChild (Try It)