Description: Selects the last matched element.
Note that :last selects a single element by filtering the current jQuery collection and matching the last element within it.
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>css demo</title>
<script src="//code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
<table>
<tr><td>First Row</td></tr>
<tr><td>Middle Row</td></tr>
<tr><td>Last Row</td></tr>
</table>
<script>
$( "tr:last" ).css({ backgroundColor: "yellow", fontWeight: "bolder" });
</script>
</body>
</html>