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http://w3c.github.io/webcomponents/spec/shadow/#event-dispatch says that "If the relatedTarget and target are the same for a given node, its the event listeners must not be invoked. TouchEvent is not subject to this rule." The latter sentence doesn't make sense since TouchEvent, nor Touch, has relatedTarget. And the spec explicitly links relatedTarget to http://www.w3.org/TR/DOM-Level-3-Events/#events-MouseEvent-relatedTarget
Moved to https://github.com/w3c/webcomponents/issues/232