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<!DOCTYPE html> <html> <head> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script> <script> $(document).ready(function(){ $(".intro, .demo, .end").css("background-color", "yellow"); }); </script> </head> <body> <h1>Welcome to My Homepage</h1> <p class="intro">This paragraph has class "intro".</p> <p>This is a paragraph.</p> <p class="demo">This paragraph has class "demo".</p> <p>This is another paragraph.</p> <p class="end">This paragraph has class "end".</p> </body> </html>
