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Selectors/first

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:first

Matches the first selected element.
While this matches only a single element, :first-child matches more than one: One for each parent.
Examples:

Finds the first table row.

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
                    "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
  <script src="http://code.jquery.com/jquery-latest.js"></script>
  
  <script>
  $(document).ready(function(){
    $("tr:first").css("font-style", "italic");
  });
  </script>
  <style>
  td { color:blue; font-weight:bold; }
  </style>
</head>
<body>
  <table>
    <tr><td>Row 1</td></tr>
    <tr><td>Row 2</td></tr>
    <tr><td>Row 3</td></tr>
  </table>
</body>
</html>

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