Input value limitation before decimal place

[akashramtohul4]

Hello friends

I want to limit the number of values before a decimal place.
For example :
I can input any number after the decimal place
like this 123456.111 but before the decimal place I can add only 3 numbers

Am trying to solve the problem using mask but am unable to get the solution

https://codepen.io/akashramtohul4/pen/vYpyQpZ

Can someone please help

Thanks

[pdanpdan]

https://codepen.io/pdanpdan/pen/MWrbzzg?editors=1010
use fill-mask to have something before the decimal point