[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [CSS](./puppeteer.protocol.css.md) > [CSSMedia](./puppeteer.protocol.css.cssmedia.md) > [styleSheetId](./puppeteer.protocol.css.cssmedia.stylesheetid.md) ## Protocol.CSS.CSSMedia.styleSheetId property Identifier of the stylesheet containing this object (if exists). Signature: ```typescript styleSheetId?: StyleSheetId; ```