The onkeyup event only detects that a keyboard button has be released (after pressing it). So it is to the JAvascript to do whatever you want done. If you write the appropriate Javascript, it can do whatever you like.

The "onkeyup" event is only the "trigger" that calls the JAvascript. it can check if there is only one number filled in, or two, or if the value filled in is 10 or 11 and so on.

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