HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>nth-last-of-type demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }
    li { margin: 4px 0; }
    #output { margin-top: 12px; padding: 12px; background: #fef3c7; font-family: monospace; white-space: pre-wrap; }
  </style>
</head>
<body>
  <ul><li>One</li><li>Two</li><li>Three</li></ul>
  <ul><li>A</li><li>B</li></ul>
  <div id="output"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#output").text(
      ":last-of-type → " + $("li:last-of-type").length + "\n:nth-last-of-type(1) → " + $("li:nth-last-of-type(1)").length
    );
  </script>
</body>
</html>

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:last-of-type vs :nth-last-of-type(1) (Try It)