W3cubDocs

/Web APIs

WheelEvent: deltaY property

The WheelEvent.deltaY read-only property is a double representing the vertical scroll amount in the WheelEvent.deltaMode unit.

Value

A number.

Examples

js

const syntheticEvent = new WheelEvent("syntheticWheel", {
  deltaY: 4,
  deltaMode: 0,
});

console.log(syntheticEvent.deltaY);

Specifications

Specification
UI Events
# dom-wheelevent-deltay

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
deltaY 31 12 17
9IE9 supports an old draft of the spec where this value was a long instead of a double.
 18 8 4.4.3 31 17 18 8 2.0

See also

© 2005–2023 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/WheelEvent/deltaY