[css3-background] Nitpick on interpretation of one keyword+offset in background-position

The current text says "If two values are given and at least one value is  
not a keyword, then the first value represents the horizontal position (or  
offset) and the second represents the vertical position (or offset)".  
There are a couple of cases where this is nonsensical, since one can have

<bg-position> = [ top | bottom ] [ <percentage> | <length> ]

(e.g. "background-position: top 10px"), where the first value clearly  
can't represent the horizontal position.

-- 
Øyvind Stenhaug
Core Norway, Opera Software ASA