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<!DOCTYPE html> <html> <head> <style> #myDIV { background-color: coral; border: 1px solid; padding: 50px; color: white; } </style> </head> <body> <div id="myDIV">This div element has an onmousemove event handler that displays a random number every time you move your mouse inside this orange field. <p>Click the button to remove the DIV's event handler.</p> <button onclick="removeHandler()" id="myBtn">Try it</button> </div> <p id="demo"></p> <script> document.getElementById("myDIV").addEventListener("mousemove", myFunction); function myFunction() { document.getElementById("demo").innerHTML = Math.random(); } function removeHandler() { document.getElementById("myDIV").removeEventListener("mousemove", myFunction); } </script> </body> </html>