A human mouse-wheel / trackpad scroll into the browser viewport (Magic Mouse scroll, trackpad
two-finger scroll, wheel). X / Y are the viewport pixel position the scroll occurred over (so a
scroll targets the element under the pointer); DeltaX / DeltaY are the scroll deltas in pixels
(positive DeltaY = down, positive DeltaX = right — matching the DOM WheelEvent convention).
A human mouse-wheel / trackpad scroll into the browser viewport (Magic Mouse scroll, trackpad two-finger scroll, wheel).
X/Yare the viewport pixel position the scroll occurred over (so a scroll targets the element under the pointer);DeltaX/DeltaYare the scroll deltas in pixels (positiveDeltaY= down, positiveDeltaX= right — matching the DOMWheelEventconvention).