[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [CSS](./puppeteer.protocol.css.md) > [CSSStyleSheetHeader](./puppeteer.protocol.css.cssstylesheetheader.md) > [frameId](./puppeteer.protocol.css.cssstylesheetheader.frameid.md) ## Protocol.CSS.CSSStyleSheetHeader.frameId property Owner frame identifier. Signature: ```typescript frameId: Page.FrameId; ```