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La propiedad de solo lectura **`WheelEvent.deltaY`** es un `double` que representa la cantidad de deslizamiento vertical en la unidad {{domxref("WheelEvent.deltaMode")}} .
## Sintaxis
```
var dY = event.deltaY;
```
## Ejemplo
```js
var syntheticEvent = new WheelEvent("syntheticWheel", {