
Hmm, I think that would be an implementation issue
If the spec calls for scrollable, collapsible regions within tables, which I know I read about, they would look just like iframes. Given that, I'm assuming browser makers would recycle the same code they use to render iframes. So while the contents of the iframe wouldn't be loaded from another URL but from a specified block element within the page, the rendering would be the same.
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Microsoft offers them the one thing most business people will pay any price for - the ability to say "we had no choice - everyone's doing it that way." -- [link|http://z.iwethey.org/forums/render/content/show?contentid=38978|Andrew Grygus]