[webkit-dev] Dimension of Render Containers

[n179911]

Hi,

Does the dimension (width X height) of Render Containers (e.g.
RenderBlock, RenderTableRow, RenderTableCell) always encompass all its
children?

For example,
The Render Block is 145 x 14 which encompasses its children
RenderInline (145x12), RenderText (145x12)

 RenderBlock (floating) {DIV} at (458,5) size 145x14 [color=#CCCCCC]
{467.00,212.00}
             RenderInline {A} at (0,0) size 145x12 [color=#004276]
{467.00,212.00}
                        RenderText {#text} at (0,1) size 145x12 {467.00,212.00}
                          text run at (0,1) width 145: "Make CNN Your Home Page"

Is this always the case? Or there are exceptions to such rule?
e.g. nested DIV Tags, does the outermost DIV Tag encompasses the inner
one and and the inner one encompasses the one inside it?

Thank you.