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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>last-of-type vs last-child</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 32rem; }
    span.lot { background: #bbf; padding: 2px 6px; border-radius: 4px; }
    span.lc { outline: 2px solid #dc2626; }
    #output { margin-top: 12px; padding: 12px; background: #e0f2fe; font-family: monospace; white-space: pre-wrap; }
  </style>
</head>
<body>
  <div>
    <span>Alpha</span>
    <span>Beta</span>
    <p>Footer note</p>
  </div>
  <div id="output"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("span:last-of-type").addClass("lot");
    $("span:last-child").addClass("lc");
    $("#output").text(
      ":last-of-type → " + $("span:last-of-type").length + " (Beta highlighted)\n:last-child → " + $("span:last-child").length + " (p is last child)"
    );
  </script>
</body>
</html>

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:last-of-type vs :last-child (Try It)