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In bug 15294, Dominic mentions a cool concept that allows general composition: defining that ALL HTML elements, by default, already have an oldest shadow tree, which is <content></content>. We should explore this and see if that's a more elegant way to spec behavior than http://dvcs.w3.org/hg/webcomponents/rev/2c3c3971a9f5
*** Bug 15802 has been marked as a duplicate of this bug. ***
http://dvcs.w3.org/hg/webcomponents/rev/bb0e2231a5f0