[cssom-view] Behavior of getBoxQuads, convert*FromNode

The following section currently just has the IDL; the algorithms for each  
method is not specified yet:

http://dev.w3.org/csswg/cssom-view/#the-geometryutils-interface

There are a number of emails discussing what these should do in certain  
edge cases, but I haven't seen a clear description of what they should do  
on a more fundamental level, so I'm not sure how to specify them.

Can someone describe these methods so I have something to work from? Are  
there concepts from other specs I should hook into? Are there any  
implementations I can look at?

cheers
-- 
Simon Pieters
Opera Software