[Home](./index.md) > [puppeteer](./puppeteer.md) > [FrameManager](./puppeteer.framemanager.md) > [\_ensureIsolatedWorld](./puppeteer.framemanager._ensureisolatedworld.md) ## FrameManager.\_ensureIsolatedWorld() method Signature: ```typescript _ensureIsolatedWorld(name: string): Promise; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | name | string | | Returns: Promise<void>