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Hi there,

In a nutshell, YUI 3 Grids sets units to be "inline-block". However, to make inline-block elements truly behave like grid units, you also have to try to collapse whitespace between those units. That's what the yui3-g container does (and that's why you need both).

Because the units are designed to contain ordinary HTML divs, paragraphs, lists, tables, etc -- i.e. content where you *don't* want the whitespace collapsed.