[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [LayerTree](./puppeteer.protocol.layertree.md) > [LayerId](./puppeteer.protocol.layertree.layerid.md) ## Protocol.LayerTree.LayerId type Unique Layer identifier. Signature: ```typescript export type LayerId = string; ```