Re: [w3c/webcomponents] Generic programs can't reliably use/manipulate documents via the DOM (#640)

@rniwa 
> For the hundredth time, I don't think polyfill should automatically work inside a shadow tree. If a component wasn't written with that polyfill in mind, what's the point of making it work in its shadow tree? It won't be using the polyfilled feature anyway. If it was written with the assumption that some feature is available in all browsers but it isn't, then that component should itself be including that polyfill.
>
> I don't think it's productive for you to keep posting a polyfill as an example. We would never be convinced that it's a compelling use case for not having closed shadow trees.

Well I disagree. Have you asked the writers and users of that polyfill what they think? Their opinion matters much more than yours does.

@robdodson @alice What do you think about closed shadow DOM making your polyfill impossible to implement for custom controls?

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