[Home](./index.md) > [puppeteer](./puppeteer.md) > [Page](./puppeteer.page.md) > [emulate](./puppeteer.page.emulate.md) ## Page.emulate() method Signature: ```typescript emulate(options: { viewport: Viewport; userAgent: string; }): Promise; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | options | { viewport: Viewport; userAgent: string; } | | Returns: Promise<void>