Should there be a :inert pseudo-class?

[benface]

HTML has a new-ish inert attribute, but as far as I can tell, the only way to select inert elements in CSS is with :is([inert], [inert] *) (since children of inert elements are also inert), which I don't think is perfect as it ignores the DOM property. Would it make sense to introduce a :inert pseudo-class, similar to :disabled? There may not be a lot of use cases for it, but I was still surprised by the lack of discussion about it (it's possible I didn't search well enough, if so I apologize).

[nt1m]

Given there's discussion into making inert CSS controllable, this might prevent it from becoming possible since it'll create circularity (cc @flackr)

[nt1m]

(Note that dialogs/fullscreen also contribute to inertness, not just the inert attribute)

[Loirooriol]

Some discussion in #8389 (comment)