Defines the behavior of the input field when it is empty, i.e. no number is present.
keep-empty
show-unit
show-zero-and-unit
0
show-unit-on-focus
Defines the behavior of the input field when it is empty, i.e. no number is present.
keep-empty- Keep the input field empty.show-unit- Show the unit sign (if any).show-zero-and-unit- Show the number0and the unit sign (if any).show-unit-on-focus- Keep the input empty, but show the unit sign when the input field is focused.