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OTP Input
Six boxes for a verification code: typing, pasting the whole code, backspace and arrow keys handled. A complete code submits itself: spinner, then success, or a shake and an error if the code is wrong (the demo code is 424242). Resending is locked behind a countdown.
No dependency: paste the HTML into your page, the CSS into your stylesheet, and the JavaScript into a function that receives the parent element (root).