[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Input](./puppeteer.protocol.input.md) > [DispatchMouseEventRequest](./puppeteer.protocol.input.dispatchmouseeventrequest.md) > [deltaX](./puppeteer.protocol.input.dispatchmouseeventrequest.deltax.md) ## Protocol.Input.DispatchMouseEventRequest.deltaX property X delta in CSS pixels for mouse wheel event (default: 0). Signature: ```typescript deltaX?: number; ```