dart:html

deltaY property

num deltaY

The amount that is expected to scroll vertically, in units determined by deltaMode.

See also:

• WheelEvent.deltaY from the W3C.

Implementation

num get deltaY {
  // deltaY may be missing or undefined.
  num? value = JS('', '#.deltaY', this);
  if (value != null) return value;
  throw new UnsupportedError('deltaY is not supported');
}