Input OTP
A one-time code, one input per character.
Installation
Default
Six digits in two groups of three, as authenticator apps print them.
Four digits
`mask` hides the digits, for a PIN.
Verify
The sixth digit submits. A wrong code shakes the row, clears it and focuses the first slot; a letter shakes its slot.
States
Incomplete turns only the empty slots; a wrong code turns all of them.