Some experiments with checkbox groups

The goal here is to figure out:



This example is a fieldset and a legend. aria-required and role="group" still present in the wrapper and in the input wrappers
This example is a fieldset and a legend. aria-required and role="group" removed from the wrapper, only present in the input wrappers
This example is a fieldset and a legend. aria-required and role="group" removed from the wrapper, as well as from the input wrappers. Inputs have a required attribute