Laws of UX · Speed and effort
Postel's Law
Be liberal in what you accept, and conservative in what you send.
The design-system take
Where the principle shows up in a token, component or pattern decision.
Forms that tolerate input variations — case, spacing, format — and outputs that are strict and predictable are both applications. Forgiving input, disciplined output.
Adapted from Postel's Law on Laws of UX — Jon Yablonski.