[css-pseudo][cssom] PseudoElement vs CSSPseudoElement

Hi,

CSSOM defines PseudoElement:

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

CSS Pseudo-Elements defines CSSPseudoElement:

   http://dev.w3.org/csswg/css-pseudo/#CSSPseudoElement-interface

Which spec is going to define this?

Similarly, CSSOM defines Element.pseudo(type) while CSS Pseudo-Elements 
defines Window.getPseudoElements(elem, type) for what seems to be the 
same purpose. [Also, I notice that Window.getPseudoElements() takes a 
type, then returns a list that can be filtered by type which seems odd 
to me.]

Best regards,

Brian