Yes, actually, it works very much like
<table>s do. In theory, it should work exactly how tables do (hence the high hopes for cross-browser support).
IMO, this is both its strongest and weakest point. Very flexible, very good support; but there’s a lot of people who don’t know the minutia of how tables actually work. But it’s mainly for me, so I don’t worry. The “safe” route is to always use
[at-row] wrappers if you’re not sure about something.
Another (prettier) example. The “sticky footer” solution is actually what inspired this.