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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(3)").css("background-color", "yellow"); }); </script> </head> <body> <h1>This is a heading in body</h1> <p>The first paragraph in body.</p> <p>The second paragraph in body (and the 3rd child element in body).</p> <div style="border:1px solid;"> <span>This is a span element in div</span> <p>The first paragraph in div.</p> <p>The second paragraph in another div (and the 3rd child element in this div).</p> <p>The last paragraph in div.</p> </div><br> <div style="border:1px solid;"> <p>The first paragraph in another div.</p> <p>The second paragraph in another div.</p> <p>The last paragraph in another div (and the 3rd child element in this div).</p> </div> <p>The last paragraph in body.</p> </body> </html>