Re: [w3c/webcomponents] ::slotted() should full support complex selector!! (#745)

very dispoint to hear that :(
if a component can support content inject via slot, however, you just can not define the style of the specific content inside that component directly. it is not cool really.

performance or functional, i prefer to first make it functional, then we talk the performance, otherwise, it is just a disability component

if there is no directly way, i have to chose 
1. define the style inside the injected content
```
<my-navbar>
**<style>ul li {color:red}</style>**
    <ul>
      <li>link1</li>
      <li>link2</li>
      <li>link3</li>
      </ul>
  </my-navbar>
```
if i use multi times of the component, means i should add that style defination each time, even that style is fixed, and should be placed in a fixed place (just inside the component). it is just a page size waste of the page which use component

2. just forget the slot function.  forget the content inject like a  normal component should support
in that case, i move the inject directly into the component's render function
however, if the inject content is different, means i should create different component. then **my-navbar1,my-navbar2,mynavabar-forhome,mynavabar-forotherpage...** will come out, that is just ungainly
it is not possible if i want write a common UI library in that case


there should be a way to support inject content style defination gracefully! @hayatoito 





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