[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Network](./puppeteer.protocol.network.md) > [ResourceTiming](./puppeteer.protocol.network.resourcetiming.md) > [workerStart](./puppeteer.protocol.network.resourcetiming.workerstart.md) ## Protocol.Network.ResourceTiming.workerStart property Started running ServiceWorker. Signature: ```typescript workerStart: number; ```