nth child selector

<html> <head> <title>jQuery nth-child example</title>   <script type="text/javascript" src="jquery.js"></script> </head>   <body>   <h1>jQuery nth-child example</h1>   <table border=1> <tr><td>Row #1</td></tr> <tr><td>Row #2</td></tr> <tr><td>Row #3</td></tr> <tr><td>Row #4</td></tr> <tr><td>Row #5</td></tr> <tr><td>Row #6</td></tr> <tr><td>Row #7</td></tr> <tr><td>Row #8</td></tr> <tr><td>Row #9</td></tr> <tr><td>Row #10</td></tr> </table> <br/>   <button>:nth-child(4)</button> <button>:nth-child(3n)</button> <button>:nth-child(even)</button>     <button>:nth-child(odd)</button>     <script type="text/javascript">     $("button").click(function () {       var str = $(this).text();       $("tr").css("background", "white");       $("tr" + str).css("background", "coral");     }); </script>   </body> </html>
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