iPhone Duo Testerduoresponsive.com

Surface Duo (1st Gen Single)

First generation single-screen mode (4:3 aspect ratio)

540 × 1350 ptPhysical 1350 × 3375 pxDPR 2.5x5.6"
Auto
Live Presets:
AMOLED 4:3 Aspect Ratio·5.6" display·Aspect Ratio 2:5
aspect-ratio: 4/3
Expert Q&A

Surface Duo (1st Gen Single) Testing FAQs

Common questions about responsive web design on Surface Duo (1st Gen Single).

What is the viewport resolution of Surface Duo (1st Gen Single)?

The Surface Duo (1st Gen Single) has a CSS viewport of 540px × 1350px at a device pixel ratio of 2.5x. The physical panel resolution is 1350 × 3375 pixels.

What CSS features are best tested on Surface Duo (1st Gen Single)?

On Surface Duo (1st Gen Single), test your layout at 540px viewport width. Verify touch target sizes (minimum 44×44px), form controls, navigation menus, and responsive typography.

How do 3:2 displays affect responsive web design?

Surface displays with a 3:2 aspect ratio have more vertical height than typical 16:9 widescreen displays. Check hero sections, sticky headers, and full-height viewports (using 100dvh) to ensure content does not spread out awkwardly.