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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery nth-child(even) demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    table { border-collapse: collapse; width: 100%; max-width: 360px; }
    td { border: 1px solid #cbd5e1; padding: 8px; text-align: center; }
    tr:nth-child(even) { background: #dbeafe; }
  </style>
</head>
<body>
  <table>
    <tr><td>Row 1</td></tr>
    <tr><td>Row 2</td></tr>
    <tr><td>Row 3</td></tr>
    <tr><td>Row 4</td></tr>
    <tr><td>Row 5</td></tr>
  </table>
  <p><small>CSS :nth-child(even) — child index starts at 1 inside each parent.</small></p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("tr:nth-child(even)").css("font-weight", "bold");
  </script>
</body>
</html>

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