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<!DOCTYPE html> <html> <head> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css"> <style> .fa { font-size: 50px; cursor: pointer; user-select: none; } .fa:hover { color: darkblue; } </style> </head> <body> <p>Click on the icon to toggle between thumbs-up and thumbs-down (like/dislike):</p> <i onclick="myFunction(this)" class="fa fa-thumbs-up"></i> <script> function myFunction(x) { x.classList.toggle("fa-thumbs-down"); } </script> </body> </html>
