deltaX property
The amount that is expected to scroll horizontally, in units determined by deltaMode.
See also:
- WheelEvent.deltaX from the W3C.
Implementation
num get deltaX {
// deltaX may be missing or undefined.
num? value = JS('', '#.deltaX', this);
if (value != null) return value;
throw new UnsupportedError('deltaX is not supported');
}