HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>documentElement vs body</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    document.getElementById("out").textContent =
      "root: " + document.documentElement.tagName + "\n" +
      "body: " + document.body.tagName + "\n" +
      "body is child of root: " +
        (document.body.parentElement === document.documentElement);
  </script>
</body>
</html>

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Document.documentElement — vs body (Try It)