HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>table child selector demo</title>

  <style>

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

    table { border-collapse: collapse; width: 100%; max-width: 480px; }

    td, th { border: 1px solid #ccc; padding: 8px; }

    tr.data-row { background: #ecfdf5; }

  </style>

</head>

<body>

  <table class="data">

    <tbody>

      <tr><td>Row 1</td><td>Data A</td></tr>

      <tr>

        <td>Row 2</td>

        <td>

          <table>

            <tbody>

              <tr><td>Nested row</td></tr>

            </tbody>

          </table>

        </td>

      </tr>

    </tbody>

  </table>

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

  <script>

    $("table.data > tbody > tr").addClass("data-row");

  </script>

</body>

</html>

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table.data > tbody > tr rows (Try It)