OTP / Verification Code Input with Auto-Advance (Vanilla JavaScript)
A 6-digit one-time-password input for login/2FA flows: typing a digit auto-advances to the next box, Backspace on an empty box jumps back, arrow keys move focus, and pasting a full code anywhere in the row distributes it across all boxes. The demo validates against a hardcoded code (123456) client-side just to show the success/shake-and-clear states - swap that check for your real backend call.
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2026
