Re: [WICG/webcomponents] "open-stylable" Shadow Roots (#909)

Two arguments I keep seeing pop up in this thread:

1. This feature is desperately needed.
2. This feature is not polyfillable.

The second statement is mostly false, as demonstrated by @Danny-Engelman's examples as well as [the proof-of-concept I published to npm](https://www.npmjs.com/package/open-stylable). (I say "mostly" because descendant selectors and `:has()` can't traverse shadow boundaries. Although it's not even clear that a real browser implementation would solve that, [based on Ryosuke's comment above](https://github.com/WICG/webcomponents/issues/909#issuecomment-742851382)).

I'll also note that my polyfill currently has ~1 weekly download, and I don't see any other polyfills on npm. If web developers were clamoring for this feature, you'd think that there would be a lot more interest in polyfills. This makes me question both of the above arguments.

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