JD_Toims - 1:57 am on Nov 14, 2013 (gmt 0)
It's round LOL
Let me try to clarify more...
The "pie" is the entirety of the document -- A document can be one page or multiple pages.
The size of the "portions people get" start with each "sectioning element" and end with the end of the "sectioning element" or implicitly with the beginning of the next "sectioning element." -- This could be on one page, or multiple pages since <body> and <hN> are sectioning elements.
The "grouping" [what I referred to as ingredients or pieces] are what "go together" to make up a "section", so...
A document is made up of sections that are made up of groupings.