Skip to main content
UI Guides

Search rules

Search all UI Guides rules by name, category, or source

formsVercel

Placeholder Value

SHOULD

SHOULD: Placeholders end with ellipsis and show example pattern (eg, `+1 (123) 456-7890`, `sk-012345…`)

Set placeholder to an example value or pattern, ending with ellipsis

Bad

Good

Why it matters

Placeholders should show example values, not labels (that's what <label> is for). The ellipsis signals that the value continues or represents a pattern. For example: "name@example.com" or "sk-proj_abc123…"

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.