[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [CSS](./puppeteer.protocol.css.md) > [StyleSheetAddedEvent](./puppeteer.protocol.css.stylesheetaddedevent.md) > [header](./puppeteer.protocol.css.stylesheetaddedevent.header.md) ## Protocol.CSS.StyleSheetAddedEvent.header property Added stylesheet metainfo. Signature: ```typescript header: CSSStyleSheetHeader; ```