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

@mrmr1993 I can definitely see how Vimium would need access to all shadow DOM - including standard elements. It would be easier for programs that don't require access to these internals to explicitly exclude them like [axe-core](https://github.com/dequelabs/axe-core/blob/shadowDOM/lib/core/utils/composed-tree.js#L73) is planning to do for the `<marquee>` element - which appears with an open shadow DOM in Chrome.

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