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<!DOCTYPE html> <html> <head> <style> .page-header{ color: red; text-transform: uppercase; } .highlight{ background: yellow; } .hint{ font-style: italic; } </style> <script src="https://code.jquery.com/jquery-3.5.1.min.js"></script> <script> $(document).ready(function(){ $("button").click(function(){ $("h1").addClass("page-header highlight"); }); }); </script> </head> <body> <h1>Hello World</h1> <p>The quick brown fox jumps over the lazy dog.</p> <button type="button">Add Class</button> </body> </html>
