Box Model and Advanced Layout: CSS3 Working Drafts
2007-08-09: The CSS Working Group released two updated Working Drafts for the Cascading Style Sheets (CSS) language Level 3. The CSS basic box model describes the basic layout of textual documents in visual media. The CSS3 Advanced Layout Module defines visual order independent of document order, position and alignment of user interface widgets, and page and window grids. Visit the CSS home page. (Permalink)
Read more at: http://www.w3.org/News/2007#item174.