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layoutVercel

Responsive Coverage

MUST

MUST: Verify mobile, laptop, ultra-wide (simulate ultra-wide at 50% zoom)

Verify on mobile, laptop, and ultra-wide screens

Bad

Good

Why it matters

Test your layouts at 320px (small mobile), 768px (tablet), 1280px (laptop), and 2560px+ (ultra-wide). Content should reflow appropriately, never horizontally scroll unexpectedly, and use available space effectively at all sizes.

References

Built by Gleb Stroganov, design engineer at Evil Martians.

The rules come from other people's skills and guidelines — Vercel, Rauno Freiberg, @Ibelick, impeccable, Emil Kowalski, Tailwind, RAMS — each one credited on the Sources page. The work here is extraction and wiring: every rule is pulled into one corpus, given a good and a bad example you can operate, a MUST/SHOULD/NEVER rule an agent can paste, and a link back to where it came from.