Attribute:superform-checkbox-min = number, superform-checkbox-max = number
Apply to:div block or link block that contains the checkboxes.
Checks the minimum and/or maximum number of checkboxes inside a specified block.
This block requires minimum 1 and maximum 3 checkboxes to be checked.
Corresponding error for identifier "checkbox"
You can have multiple blocks of checkboxes inside a step.
Multiple blocks need different identifiers (names), this way Superform can distinguish between each block of checkboxes and also provide the ability for different error messages.
