HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery root selector demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    span.fot { color: red; font-size: 120%; font-style: italic; }
  </style>
</head>
<body>
  <p>The root of this document is: <span id="log"></span></p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("<span class='fot'>")
      .html($(":root")[0].nodeName)
      .appendTo("#log");
  </script>
</body>
</html>

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jQuery :root — official nodeName demo (Try It)