puppeteer/new-docs/puppeteer.protocol.emulation.setdevicemetricsoverriderequest.viewport.md

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Protocol.Emulation.SetDeviceMetricsOverrideRequest.viewport property

If set, the visible area of the page will be overridden to this viewport. This viewport change is not observed by the page, e.g. viewport-relative elements do not change positions.

Signature:

viewport?: Page.Viewport;