Re: Drop-Shadow proposal

"As mentioned previously, the default behavior is to cast a shadow  
from the entire element. This means pre-rendering the element,  
including borders, background, border-images, text, and non-positioned  
child elements, and using that to cast a single shadow."

Why non-positioned only?  It seems like a property like this should  
behave like opacity (and just establish a stacking context with a z- 
index of 0), with all the same rules for consistency.

dave