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<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Example of Keyup Event</title> <style> .normal { background-color: transparent; } .active { background-color: lightgreen; } </style> <script> document.addEventListener('DOMContentLoaded', function () { const textArea = document.getElementById('textArea'); textArea.addEventListener('keyup', function(event) { console.log('Key up:', event.key); if (event.key === "Control") { this.classList.remove('active'); this.classList.add('normal'); } }); textArea.addEventListener('keydown', function(event) { if (event.key === "Control") { this.classList.add('active'); } }); }); </script> </head> <body> <textarea id="textArea" rows="4" cols="50" placeholder="Press and release 'Control' to see the effect"></textarea> </body> </html>