RESPONSIVE WEBSITE TESTING
Test the layout, not just the screen.
A responsive website testing tool is most useful when it turns a range of viewports into one repeatable workflow. Compare the same page and content state, find the breakpoint where the experience fails, and leave enough evidence for someone else to fix it.
1. Choose representative viewports
Start with a compact phone, a large phone, a tablet, and a laptop. Add the exact widths around important CSS breakpoints instead of collecting many nearly identical device presets. A desktop view is useful for checking content density and navigation, but it should not replace the narrowest supported layout.
2. Keep the page state consistent
Open the same URL, account state, test data, and navigation path in every viewport. Side-by-side comparison is strongest when a changed layout is the only meaningful difference. Synchronized scrolling and navigation can shorten this pass when the previews share a matching structure.
3. Check the failure-prone details
- Horizontal overflow, clipped controls, and unexpected fixed layers.
- Long translated strings, empty states, errors, and real content density.
- Navigation, dialogs, forms, keyboard focus, and touch target size.
- Breakpoints immediately above and below the expected transition.
4. Capture an actionable issue
Record the affected viewport, expected behavior, actual behavior, page URL, and a short reproduction path. A screenshot or annotated capture should show enough surrounding context to identify the component. A structured fix prompt can carry the same context into a coding tool, but the prompt is copied locally and does not produce or upload code by itself.
5. Finish on real devices
Viewport emulation is a fast responsive development check, not full hardware or browser-engine emulation. Validate critical flows on target browsers and physical devices, especially safe-area behavior, virtual keyboards, scrolling, performance, and touch interaction.
Mobile View lets you compare up to four phone, tablet, laptop, and desktop previews locally, then capture evidence or continue on a physical phone.
Open the Mobile View responsive testing workspace →