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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/WheelEvent below:

WheelEvent - Web APIs | MDN

Baseline Widely available *

The WheelEvent interface represents events that occur due to the user moving a mouse wheel or similar input device.

Note: This is the standard wheel event interface to use. Old versions of browsers implemented the non-standard and non-cross-browser-compatible MouseWheelEvent and MouseScrollEvent interfaces. Use this interface and avoid the non-standard ones.

Don't confuse the wheel event with the scroll event:

• A wheel event doesn't necessarily dispatch a scroll event. For example, the element may be unscrollable at all. Zooming actions using the wheel or trackpad also fire wheel events.
• A scroll event isn't necessarily triggered by a wheel event. Elements can also be scrolled by using the keyboard, dragging a scrollbar, or using JavaScript.
• Even when the wheel event does trigger scrolling, the delta* values in the wheel event don't necessarily reflect the content's scrolling direction.

WheelEvent()

Creates a WheelEvent object.

This interface inherits properties from its ancestors, MouseEvent, UIEvent, and Event.

WheelEvent.deltaX Read only

Returns a double representing the horizontal scroll amount.

WheelEvent.deltaY Read only

Returns a double representing the vertical scroll amount.

WheelEvent.deltaZ Read only

Returns a double representing the scroll amount for the z-axis.

WheelEvent.deltaMode Read only

Returns an unsigned long representing the unit of the delta* values' scroll amount.

WheelEvent.wheelDelta Read only Deprecated Non-standard

Returns an integer (32-bit) representing the distance in pixels.

WheelEvent.wheelDeltaX Read only Deprecated Non-standard

Returns an integer representing the horizontal scroll amount.

WheelEvent.wheelDeltaY Read only Deprecated Non-standard

Returns an integer representing the vertical scroll amount.

Note: Element: mousewheel event has additional documentation about the deprecated properties wheelDelta, wheelDeltaX, wheelDeltaY.

This interface doesn't define any specific methods, but inherits methods from its ancestors, MouseEvent, UIEvent, and Event.

• wheel event
• Interfaces replaced by this one:
  • Gecko's legacy mouse wheel event object: MouseScrollEvent

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