Unlike most other fields the list box and checkbox group fields don't have a "required" property. That's because these fields can have more than one value.
For example, a drop-down list or a radio group let you pick one option, a text field let's you enter a string of text. But you might want a user to check all of the boxes, or pick at least two options from the list.
Minimum and Maximum Values
Rather than a required property, the list box and checkbox group fields have minimum and maximum properties that control the number of options that must be selected for the field to pass validation:
Examples
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