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<!DOCTYPE html> <html> <head> <title>CSS Not Applied</title> <style> .hidden { display: none; } </style> </head> <body> <div id="content">This is visible</div> <button id="hide-content">Hide Content</button> <script> document.getElementById('hide-content').addEventListener('click', function() { const content = document.getElementById('content'); content.classList.add('hidden'); }); </script> </body> </html>