[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [CSS](./puppeteer.protocol.css.md) > [CSSStyleSheetHeader](./puppeteer.protocol.css.cssstylesheetheader.md) > [styleSheetId](./puppeteer.protocol.css.cssstylesheetheader.stylesheetid.md) ## Protocol.CSS.CSSStyleSheetHeader.styleSheetId property The stylesheet identifier. Signature: ```typescript styleSheetId: StyleSheetId; ```