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<!DOCTYPE html> <html> <body> <h1>WheelEvent deltaY Property</h1> <p>Resize the DIV element by scrolling inside it:</p> <div onwheel="myFunction(event)" style="width:100px;height:100px;background-color:Tomato"></div> <script> function myFunction(event) { var y = event.deltaY; var currentSize = event.target.style.width; if (y > 0) { newSize = parseInt(currentSize) + 10; } else { newSize = parseInt(currentSize) - 10; } event.target.style.width = newSize + "px"; event.target.style.height = newSize + "px"; } </script> </body> <!-- /jsref/tryit.asp?filename=tryjsref_event_wheel_deltay2 </html>
