[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [LayerTree](./puppeteer.protocol.layertree.md) > [CompositingReasonsRequest](./puppeteer.protocol.layertree.compositingreasonsrequest.md) > [layerId](./puppeteer.protocol.layertree.compositingreasonsrequest.layerid.md) ## Protocol.LayerTree.CompositingReasonsRequest.layerId property The id of the layer for which we want to get the reasons it was composited. Signature: ```typescript layerId: LayerId; ```