Hacker News Reader

The spec goes into detail of why existing tech (iframes) aren't enough:

To be clear, this FAQ isn't actually part of the spec (which I'm counting as the document here: https://wicg.github.io/portals/).

Heh, "we considered this but it's hard to do in Chrome".

But they don't give a shit if <portal> is hard to do in Gecko, of course.