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formsVercel

Don't Block Typing

MUST

MUST: Don't block typing; accept free text and validate after

Allow all input and show validation feedback instead of blocking keystrokes

Bad

Good

Why it matters

When you prevent users from typing certain characters, they don't understand why their keyboard isn't working. It's better to accept all input and provide clear validation messages that explain what format is expected.

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.