The WheelEvent.deltaY read-only property is a double representing the vertical scroll amount in the WheelEvent.deltaMode unit.


var dY = event.deltaY;


var syntheticEvent = new WheelEvent("syntheticWheel", {"deltaY": 4, "deltaMode": 0});



Specification Status Comment
Document Object Model (DOM) Level 3 Events Specification
The definition of 'WheelEvent.deltaY' in that specification.
Working Draft Initial definition.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 31 17.0 (17.0) 9.0 [1] 18 9.0
Feature Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support (Yes) 17.0 (17.0) ? (Yes) No support

[1] IE9 supports an old draft of the spec where this value was a long instead of a double.

See also

Document Tags and Contributors

 Contributors to this page: IceCreamYou, teoli
 Last updated by: IceCreamYou,