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

I think he did address the Vimium example; browser extensions are non-standard, the browser can allow them to access Shadow DOM if they want to. It's a bug to report to Chrome's extension API.

Personally I do not use closed shadow roots because I just don't care if outside code accesses it, but I can see the argument for it just fine.  Let me ask you this @dylanb, does it cause problems for you that you can't access built-in element's shadow DOM?  If not, then why is it a problem for custom elements?

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