Jonathan wrote:
> My understanding is when Mozilla paints a page, it walks thru the
> Frame hierarchy to paint each frame.
> Can you please tell me if mozilla walks thru the frame hierarchy in a
> depth first approach or breath first approach?

Depth first, sort of.  This is specified by CSS 2.1, for what it's worth.  See 
the detailed z-ordering algorithm described there.

-Boris
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