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The term "escape" does not appear to be defined. If the relevant bit is actually "event retargeting" it might be better to just stick to that. Introducing more terms than needed for a concept is confusing and does not help when grasping a complex subject.
http://dvcs.w3.org/hg/webcomponents/rev/e6af7652d0ce Removed "escapes", reformulated to use DOM4 terminology.