HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>nth-last-child demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }
    p { margin: 8px 0; padding: 6px 10px; border: 1px solid #e2e8f0; border-radius: 6px; }
    #output { margin-top: 12px; padding: 12px; background: #fef3c7; font-family: monospace; white-space: pre-wrap; }
  </style>
</head>
<body>
  <div><p>Alpha</p><p>Beta</p><p>Gamma</p></div>
  <div><p>One</p><p>Two</p></div>
  <div id="output"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#output").text(
      ":last-child → " + $("p:last-child").length + "\n:nth-last-child(1) → " + $("p:nth-last-child(1)").length
    );
  </script>
</body>
</html>

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:last-child vs :nth-last-child(1) (Try It)