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First discussed in: https://groups.google.com/d/topic/polymer-dev/a4rFb6NgktE/discussion As specified now, the order of "created" callback in a DOM tree will be different for for parsing versus cloning For example, in http://jsbin.com/uxIbOQo/2/edit?js,console The output is: "order of callbacks when parsing:" "C" "B" "A" "order of callbacks when cloning:" "A" "B" "C" This seems inconsistent. We should consider removing the special-casing of callback ordering in HTML parser.
Implementer feedback: I have made Blink follow this proposed ordering.
https://github.com/w3c/webcomponents/commit/e0f06bec902b98eef8981b8a34095a265a4051cc