Web/API/WheelEvent/deltaY

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

Syntax

var dY = event.deltaY;

Example

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

console.log(syntheticEvent.deltaY);

Specifications

Specification	Status	Comment
Document Object Model (DOM) Level 3 Events SpecificationThe definition of 'WheelEvent.deltaY' in that specification.	Obsolete	Initial definition.

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
deltaY	Chrome Full support 31	Edge Full support 12	Firefox Full support 17	IE Full support 9 Notes' Full support 9 Notes' Notes' IE9 supports an old draft of the spec where this value was a long instead of a double.	Opera Full support 18	Safari Full support 6.1	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support 17	Opera Android Full support Yes	Safari iOS No support No	Samsung Internet Android Full support Yes

Legend

Full support  

Full support

No support  

No support

See implementation notes.'

See implementation notes.

See also

• wheel
• WheelEvent

WheelEvent.deltaY by Mozilla Contributors is licensed under CC-BY-SA 2.5.