RE: Why no Parent Selector?

Thanks for the link to the draft.  It is very interesting and happy-making. 
 I had composed a detailed reply with a few examples, and my email program 
crashed on attempt to send it.  In a nutshell, there seems to be nothing to 
prevent using more than one :subject pseudo-class in a single selector.

	DIV.draft:subject INS:subject {}

This can be useful and help with selector brevity; it's the same as the 
following.

	DIV.draft:subject INS, DIV.draft INS {}

 However, what happens when you use the following?
	
	DIV.big SPAN.big {font-size:200%;}

Is the font-size of SPAN.big 200% or 400% of the parent of DIV.big?