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<!DOCTYPE html> <html> <head> <script src="/lib/jquery-1.12.2.min.js"></script> <script> $(document).ready(function(){ $("p:nth-child(3n+2)").css("background-color", "yellow"); }); </script> </head> <body> <p>The p:nth-child(3n+2) selects each 3rd paragraph, starting at the 2nd child element. <div style="border:1px solid;"> <span>This is a span element</span> <p>The first paragraph (and the second child in div).</p> <p>The second paragraph.</p> <p>The third paragraph.</p> <p>The fourth paragraph.</p> <p>The fifth paragraph.</p> <p>The sixth paragraph.</p> <p>The seventh paragraph.</p> <p>The eight paragraph.</p> </div><br> </body> </html>