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https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#dfn-active-insertion-point Section 4.2 refers the concept of "active insertion point". However, there is no clear definition of that. Although it might be there if the reader read it carefully, it would be better if it is clearly defined in single place.
Fixed. The new spec defines that clearly. https://dvcs.w3.org/hg/webcomponents/rev/dbf47f602628