[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Input](./puppeteer.protocol.input.md) > [EmulateTouchFromMouseEventRequest](./puppeteer.protocol.input.emulatetouchfrommouseeventrequest.md) > [deltaY](./puppeteer.protocol.input.emulatetouchfrommouseeventrequest.deltay.md) ## Protocol.Input.EmulateTouchFromMouseEventRequest.deltaY property Y delta in DIP for mouse wheel event (default: 0). Signature: ```typescript deltaY?: number; ```