HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>lastElementChild children</title>
</head>
<body>
  <div id="box"><p>One</p><p>Two</p></div>
  <pre id="out"></pre>
  <script>
    var box = document.getElementById("box");
    var last = box.children[box.children.length - 1];
    document.getElementById("out").textContent =
      String(box.lastElementChild === last) + "\n" + box.lastElementChild.tagName;
  </script>
</body>
</html>

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Element.lastElementChild — children[last] (Try It)