[css-regions] Pseudo elements and rfcb

Hi all,

According to the regions editor's draft [1], pseudo elements such as :before and :after can be used to mark to beginning and the end of a region box. It is not clear to me how pseudo elements with display: inline should be laid out in relation to the rfcb. At [2], the rfcb is defined as a block container box, which leads me to believe that pseudo elements cannot be inlined with the flow content. This seems like the right behaviour, though it is not explicitly described in the spec.
I suggest that a description with the expected behaviour be added to the pseudo elements' section.

-Cătălin Badea

[1] http://dev.w3.org/csswg/css-regions/#pseudo_elements

[2] http://dev.w3.org/csswg/css-regions/#regions-flow-content-box