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There appears no logical place to indicate that some input is "required" for a group of checkboxes. If you inserted "required" into each checkbox, it would require that each checkbox be checked. While checkboxes may be either checked or unchecked, a scenario is possible in which at least one checkbox would be required, such as asking the User which language she/he speaks. (Ostensibly this is at least one, as they are interacting with the form). <select multiple> offers an alternative, but can be visually daunting; checkboxes provide an elegant method for the User to review his/her selections, at-a-glance. Thank you for reviewing my bug submission. John
Moved to the HTML repo as issue 936: https://github.com/w3c/html/issues/936