[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [CSS](./puppeteer.protocol.css.md) > [AddRuleRequest](./puppeteer.protocol.css.addrulerequest.md) > [styleSheetId](./puppeteer.protocol.css.addrulerequest.stylesheetid.md) ## Protocol.CSS.AddRuleRequest.styleSheetId property The css style sheet identifier where a new rule should be inserted. Signature: ```typescript styleSheetId: StyleSheetId; ```