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

> It's also worth noting that none of the browsers (Chrome, Firefox, Edge) supporting Web Extensions have previously needed to expose any supplemental APIs for DOM access; the DOM has been generic, well-specified and powerful enough to read and modify the document in all the necessary ways.

That's absolutely untrue. Browsers already have to provide a mechanism to inject code into every cross-origin iframe's document even though the top-level document ordinarily don't have access to.

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