In this Blazor FormattedInput demo the input is restricted from 0 to 1000 (decimal). When the user enters a value whose decimal equivalent is not from 0 to 1000, the Blazor FormattedInput automatically updates the value to the chosen numeral system's equivalent of 0 or 1000 depending on whether the value's decimal equivalent is below 0 or above 1000. That happens on blur event or Enter keypress.