[ShadyCSS] Selectors for slot element does not work

[tomalec]

Selectors like .foo .classy-slot::slotted(*) does not work.

Steps to reproduce

0. Define custom element as Shadow DOM per element is not supported,

1. Create Shadow Root.

2. Add <slot> element with a class on it,

3. Add <style> element that (according to the README)

   have a selector to the left of the ::slotted pseudo-element.

   Precisely have a selector for the slot element itself, like .foo slot.bar::slotted(*)

4. Create an instance of this element (shadow host), add a child element inside.

Expected behavior

The selector should match child element, and apply rules to it.

Actualbehavior

The rules are not applied

Live example

https://jsbin.com/yayoyaw/edit?html,output