A number input field lets the people using your design generator set a numeric property of the design, such as an element's opacity, rotation, or max font size. You add it through the custom-property route: select the element, click Select Custom Property in the add popup, then click the number you want to expose in the Property Panel (see Adding input fields).
Three settings shape what users can enter:
- Min value: the lowest number allowed.
- Max value: the highest number allowed.
- Increment: how much each step up or down changes the value.