Re: [webcomponents] [Shadow] activeElement behavior seems to break encapsulation (#358)

In the current spec:

- A slot does not participate in the composed tree.
- Thus, slot can not be styled.

A good analogy for a slot is that DocumentFragment, which will *disappear* once their role ended when the composition finished.

We discussed this topic in https://github.com/w3c/webcomponents/issues/308 and concluded we should not consider a slot being the composed tree until v2 because no browser support for {display: contents} and that will not happen soon.


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Reply to this email directly or view it on GitHub:
https://github.com/w3c/webcomponents/issues/358#issuecomment-179570330