So the curious case here is html/semantics/forms/the-label-element/clicking-interactive-content.html where browsers fail for <object> but not <object usemap>. If I add <span> or <div> I get the same results (only the last of the three tests fails) so I suspect that all browsers do have some logic to consider <object usemap> interactive? Despite Chrome and Safari not supporting <object usemap> otherwise.
(You could imagine more cases by the way such as what happens when the object element does have a nested browsing context and whether that is considered interactive. Generally coverage seems pretty poor.)
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