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<!DOCTYPE html> <html> <head> <style> #myDIV { border: 1px solid black; } </style> </head> <body> <div id="myDIV">This example uses the HTML DOM to assign an "onwheel" event to a DIV element. Roll the mouse wheel over me - either up or down!</div> <p>A function is triggered when you roll the mouse wheel over div. The function sets the font-size of div to 35 pixels.</p> <p><strong>Note:</strong> The onwheel event is not supported in Internet Explorer or Safari.</p> <script> document.getElementById("myDIV").onwheel = function() {myFunction()}; function myFunction() { document.getElementById("myDIV").style.fontSize = "35px"; } </script> </body> </html>