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They could always fall back to storing a value in a hidden element in the worst case. All/some/none selected is often done with an indeterminate state checkbox https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/... that can represent all three states.

Maybe I don't understand the problem you are talking about.

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As soon as you need to store some state elsewhere you can store it in another suitable form (there's often some state not visually represented). I seem to recall jQuery stored state on a POJO (plain old JavaScript object) within a JavaScript variable of an element.

> They could always fall back to storing a value in a hidden element in the worst case.

This approach sounds like it's desperately trying to shove a square peg through a round hole. Why would anyone choose to use an element, hidden or not, to store a value as an alternative to use a very pedestrian JavaScript variable?

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