[WICG/webcomponents] Clarification which pseudo selectors work with `::slotted` and `::part` (#934)

I've been trying to figure out lately which pseudo selectors are working with `::slotted` and `::part` and which don't, I can't seem to find an official list, I've seen some references to _simple selectors_, but I can't figure out what counts as a _simple selector_ and what counts as a _complex selector_ .

So my question is, is there an official list of selectors that work with `::slotted` and `::part`? If yes, where can I find it?

Hope this is not out of scope for this repo, I've tried  stack overflow in the past but it didn't bear any fruits
https://stackoverflow.com/questions/67936212/combining-the-slotted-and-part-pseudo-elements
https://stackoverflow.com/questions/68166993/combining-slotted-with-pseudo-elements

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