ScreenSize.net analyzed 1,080 browser sessions to measure real viewport dimensions across devices. The most common desktop viewport is 1920×920px (11% of samples), while mobile viewports concentrate around 400px width (50% of mobile samples), and most devices use a 1.0x device pixel ratio (56.8% of samples).
Modern browsers no longer require the initial-scale=1.0 viewport meta tag, which was historically needed to fix zooming issues in older iOS and mobile browsers. Developers can now use just <meta name="viewport" content="width=device-width"> to achieve responsive design, saving 19 bytes per document.
A simulator for the iPhone Duo foldable device allows developers to preview websites across its dual displays: an inner 890x626px display and outer 466x678px display. The device features a titanium hinge supporting five postures, launches October 23, 2026, and requires specific CSP headers to embed sites in the simulator.