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});
console.log(syntheticEvent.deltaX);
| Specification | Status | Comment |
|---|---|---|
| Document Object Model (DOM) Level 3 Events Specification The definition of 'WheelEvent.deltaX' in that specification. | Obsolete | Initial definition. |
| 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.
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https://developer.mozilla.org/en-US/docs/Web/API/WheelEvent/deltaX