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<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>jQuery eq selector demo</title>

  <style>

    body { font-family: sans-serif; padding: 16px; }

    td { border: 1px solid #ccc; padding: 8px 12px; text-align: center; }

    table { border-collapse: collapse; }

  </style>

</head>

<body>

  <table>

    <tr><td>TD #0</td><td>TD #1</td><td>TD #2</td></tr>

    <tr><td>TD #3</td><td>TD #4</td><td>TD #5</td></tr>

    <tr><td>TD #6</td><td>TD #7</td><td>TD #8</td></tr>

  </table>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    $("td:eq(2)").css("color", "red");

  </script>

</body>

</html>

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jQuery td:eq(2) — official demo (Try It)