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.
Obsolete Initial definition.

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 31 (Yes) 17.0 (17.0) 9.0 [1] 18 9.0
Feature Android Edge Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support (Yes) (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

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