No estándar
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.
Sumario
La propiedad onwheel devuelve el código del controlador de eventos onwheel en el elemento actual.
Syntax
element.onwheel = event handling code
Notas
El evento wheel se genera cuando el usuario desplaza el contenido de un elemento.