Using a Single Input for one-time-code

The other night I had a bit of fun trying to create a single-input one-time-code:

one-time-code is a valid autocomplete-value, and with a few lines of JS, it let's you fill out the field from a text-message (sms).

More often, it's called OTP, though.

From Wikipedia:

A one-time password (OTP), also known as a one-time PIN, one-time authorization code (OTAC) or dynamic password, is a password that is valid for only one login session or transaction, on …

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