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<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> <style> body { padding: 25px; background-color: white; color: black; font-size: 25px; } .dark-mode { background-color: black; color: white; } </style> </head> <body> <h2>Toggle Dark/Light Mode</h2> <p>Click the button to toggle between dark and light mode for this page.</p> <button onclick="myFunction()">Toggle dark mode</button> <script> function myFunction() { var element = document.body; element.classList.toggle("dark-mode"); } </script> </body> </html>