[css21] computed value of top/bottom for relative positioning

Given the following tree:

   G
     P
       C

... with the following styles:

   G { height:100px }
   P { position:relative; bottom:25%; height:0 }
   C { position:relative; bottom:inherit }

http://www.w3.org/TR/CSS21/visuren.html#position-props states that for a  
relative positionined element the computed value of 'bottom' (which is  
also the inherited value) is defined in  
http://www.w3.org/TR/CSS21/visuren.html#relative-positioning However, that  
section states that the computed value of 'top' will be -bottom (i.e.  
-25%) because 'top' is auto (initial value), but it does not state what  
the computed value of 'bottom' is in that case which makes it unclear what  
'bottom' for element C means (i.e. is it 25% (leads to 0 here) or 25px).  
The releative positioning section should probably be more clear on what  
the computed value is here unless I'm missing something.


-- 
Anne van Kesteren
<http://annevankesteren.nl/>
<http://www.opera.com/>