WheelEvent: deltaX property
  The WheelEvent.deltaX read-only property is a
  double representing the horizontal scroll amount in the
  WheelEvent.deltaMode unit.
Value
A number.
Examples
js
const syntheticEvent = new WheelEvent("syntheticWheel", {
  deltaX: 4,
  deltaMode: 0,
});
console.log(syntheticEvent.deltaX);
Specifications
| Specification | 
|---|
| UI Events # dom-wheelevent-deltax | 
Browser compatibility
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