HTML Code

<!DOCTYPE html>



<html lang="en">



<head>



  <meta charset="utf-8">



  <title>first() method demo</title>



  <style>



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



    td { border: 1px solid #ccc; padding: 8px 12px; }



    table { border-collapse: collapse; }



  </style>



</head>



<body>



  <table>



    <tr><td>Row 1</td></tr>



    <tr><td>Row 2</td></tr>



    <tr><td>Row 3</td></tr>



  </table>



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



  <script>



    $("tr").first().css("font-style", "italic");



  </script>



</body>



</html>

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.first() method — modern replacement (Try It)