[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [CSS](./puppeteer.protocol.css.md) > [StyleSheetAddedEvent](./puppeteer.protocol.css.stylesheetaddedevent.md) ## Protocol.CSS.StyleSheetAddedEvent interface Fired whenever an active document stylesheet is added. Signature: ```typescript export interface StyleSheetAddedEvent ``` ## Properties | Property | Type | Description | | --- | --- | --- | | [header](./puppeteer.protocol.css.stylesheetaddedevent.header.md) | [CSSStyleSheetHeader](./puppeteer.protocol.css.cssstylesheetheader.md) | Added stylesheet metainfo. |