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<!DOCTYPE html> <html> <head> <script src="/lib/jquery-1.12.2.min.js"></script> <script> $(document).ready(function(){ $(":header").css("background-color", "yellow"); }); </script> </head> <body> <h1>Welcome to My Homepage</h1> <h2>My Fantastic Homepage</h2> <h3>It's amazing!</h3> <p class="intro">My name is Donald.</p> <p>I live in Duckburg.</p> <p>My best friend is Mickey.</p> <p>Who is your favourite:</p> <ul id="choose"> <li>Goofy</li> <li>Mickey</li> <li>Pluto</li> </ul> </body> </html>