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Preview on phones and tablets
Real device emulation: viewport, pixel density, touch and user agent.
- 1
Pick a device
In Modify → Headers & Cookies → Device & Browser choose Desktop 1440×900, Laptop 1366×768, iPhone / iOS, Android / Pixel or Tablet / iPad. The page reloads as that device.

- 2
Custom size
Open Custom dimensions, set width, height, scale and optionally a user agent, Mobile layout and Touch enabled, then Apply Custom Device.

- 3
Back to normal
Browser Default removes the emulation.
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