[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Page](./puppeteer.protocol.page.md) > [ScreencastFrameAckRequest](./puppeteer.protocol.page.screencastframeackrequest.md) > [sessionId](./puppeteer.protocol.page.screencastframeackrequest.sessionid.md) ## Protocol.Page.ScreencastFrameAckRequest.sessionId property Frame number. Signature: ```typescript sessionId: integer; ```