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"Replace ELEMENT with UPGRADE in TREE" After this operation in the upgrade algorithm, the ELEMENT becomes a free-floating element. Should we: 1) fire an event on ELEMENT (what's the name of the event?) 2) Setting a property on ELEMENT pointing to UPGRADE? Or maybe this is just event information?
http://dvcs.w3.org/hg/webcomponents/rev/b5dde431db43. Event should be enough.