The point about elements on the page shifting around is huge. I've personally dreamed of a browser change that would make reflows that are out of the current br

The point about elements on the page shifting around is huge. I've personally dreamed of a browser change that would make reflows that are out of the current browser viewport not change your position on the page. If you have a slow connection or view certain types of content (liveblogs, etc) this can become a huge pain. Just thinking about it raises all sorts of questions about whether the browser/rendering engine can actually reliably know that information, but it doesn't mean I can't dream.