Aug 2026 · 4 min read
Smoke-test desktop, tablet, and mobile separately
A flow that passes at 1280px can still hide the button you need at 390px. Run the same URL in three viewports.
Desktop is the viewport most people check before a deploy. The production failures that show up in support are often a nav item that drops into a menu, a sticky bar covering the submit button, or a form that only fits when the keyboard is closed.
ShipCheck can rerun the same URL at desktop (1280×720), tablet (768×1024), and mobile (390×844). Keep the first run on desktop to see the happy path, then switch viewport and look for steps that fail only at the narrow width.
Pair that with visual diffs when the layout moved but the clicks still succeeded. A pass without a screenshot is a weaker signal on mobile.