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


var dX = event.deltaX;


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



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

Browser compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 31 (Yes) 17.0 (17.0) 9.0 [1] 18 No support
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

Document Tags and Contributors

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