Re: [webcomponents] Unclear regarding Shadow boundary-piercing combinators (#357)

I don't have any strong opinion. :)

AFAIR, I added this non-normative paragraph when I heard a complaint such as:

> "Hey! I can not *Find in a page* by a keyword, such as "/deep/" in the Shadow DOM spec! Where are the definitions? ... Ops, these are defined in CSS Scoping spec? Who can notice that! It's reader unfriendly!"

So this paragraph is purely non-normative and just telling reader, "Please consult CSS Scoping spec for these selectors, including the current status of that".

It's okay to make a PR, but please make the duplication minimum. We might not want to update the Shadow DOM spec when something happens on these selectors on the CSS Scoping spec.



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