Re: [w3c/webcomponents] > ""::slotted() should full support complex selector"" has came up multiple time and always get closed without any solution. (#881)

Well it works very just fine for my ribbon example, exactly as wanted with ::part() instead of ::slotted(), i tried up to 10 level of nested element inside the shadow dom and again, just fine.
When you talked about performance i even said it could be completely avoided by using some kind of attribute, therefore wouldn't lead to any parsing that could lead to slow down.

So i'll just leave [this](https://github.com/w3c/webcomponents/issues/881#issuecomment-632990058) here;
> Well, it's not my opinion that supporting the ability to style any descendent of slotted content incurs unacceptable performance cost. That's a matter of fact statement we know as a browser engine implementor. And people who use web browsers care a lot about performance & responsiveness so we're constrained by that need. - @rniwa 



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