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formsVercel

Error Placement

MUST

MUST: Errors inline next to fields; on submit, focus first error

Show errors next to their fields and focus the first error on submit

Bad

Good

Why it matters

Errors should appear immediately adjacent to the field they relate to. When a form is submitted with errors, automatically focus the first problematic field so users can start fixing issues immediately. This is especially important for long forms.

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.