Based on https://developer.mozilla.org/en-US/docs/Web/HTML/Content_categories#interactive_content there's a few elements left that are defined as interactive but aren't currently noted as supported for interest events.

<embed> and <object> I think can be disregarded. <img> is handled by virtue of the fact <area> is supported.

But <label> and <iframe> particularly I think are interesting.

<label> isn't on its own focusable but I could maybe see people wanting hover tooltips for it, To extend the target area compared to just putting it on say an checkbox input.

Just raising this issue to see if there's anything else missing to add to ensure the spec is complete.