Re: [WICG/webcomponents] Interaction between imperative slotting and declarative shadow DOM (Issue #967)

justinfagnani left a comment (WICG/webcomponents#967)

> Some elements that use manual slot assignment only do so for simple heuristics, such as tag matching or so. Perhaps we could use CSS queries to help here?

I don't think it'd be good to mix CSS in here. I think it'd be confusing that you could use selectors to make the initial slot assignments for DSD, but not for non-DSD, and it wouldn't be in sync after any changes. Selectors also work only against elements, but text nodes can be slotted.

If we added selectors I think it'd be better to just do the `content` selector like in v0, but that's a whole other discussion that was already had in the v1 days. Someone could re-open that discussion, but I think it would be best separated from DSD.

The only thing we can say about manual slot assignment is that children can be assigned to one slot. I think some very simple indexing, like above, is about the only thing that maps directly: `<slot initialelements="0 2 4">`.

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