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Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
Summary
The onwheel property returns the onwheel event handler code on the current element.
Syntax
element.onwheel = event handling code
Notes
The wheel event is raised when the user scrolls the contents of a element.
See also
Bug 18542 – onmousewheel attribute should be replaced with onwheel