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

I wouldn't say either example is "good".

The dictation can be implemented by either making websites or components collaborate. Furthermore, adding the dictation to a website that's not otherwise designed to do so is usually done at the browser level as a plugin / extension. If a website truly needed a dictation, e.g. e-book site, then that website can natively support & implement dictation as needed everywhere.

For polyfils, I don't think polyfills spilling into a component's shadow tree by default is a good idea at all because polyfills can break components that don't expect them to exist. These kind of isolations and opt-ins are precisely what shadow DOM API should provide.

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