HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery last selector demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    td { color: blue; font-weight: bold; border: 1px solid #ccc; padding: 8px 12px; }
    table { border-collapse: collapse; }
  </style>
</head>
<body>
  <table>
    <tr><td>First Row</td></tr>
    <tr><td>Middle Row</td></tr>
    <tr><td>Last Row</td></tr>
  </table>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("tr:last").css({ backgroundColor: "yellow", fontWeight: "bolder" });
  </script>
</body>
</html>

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jQuery tr:last — official demo (Try It)