[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [DeviceOrientation](./puppeteer.protocol.deviceorientation.md) > [SetDeviceOrientationOverrideRequest](./puppeteer.protocol.deviceorientation.setdeviceorientationoverriderequest.md) > [alpha](./puppeteer.protocol.deviceorientation.setdeviceorientationoverriderequest.alpha.md) ## Protocol.DeviceOrientation.SetDeviceOrientationOverrideRequest.alpha property Mock alpha Signature: ```typescript alpha: number; ```