Re: [w3c/webcomponents] Disallow attachShadow(...) for some elements. (#110)

> Why should it matter if UAs implement some elements using shadow DOM internally? It seems that should be an implementation detail not exposed in specs.

In theory, yes, in practice no. The fact these elements are implemented using shadow DOM would mean that we'd have to define exactly what happens when an author defined shadow root is attached, and we've never successfully done that. Furthermore, this poses a serious implementation challenge since having multiple shadow root isn't a thing in v1 API and its implementation. Supporting multiple generations of shadow roots in v0 had a huge implementation cost.

If and when a sensible proposal is made for defining what it means for these elements to have a shadow root, we can revisit this decision.

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/w3c/webcomponents/issues/110#issuecomment-591233574