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http://w3c.github.io/webcomponents/spec/shadow/#retargeting-focus-events mentions DOMFocusIn/Out events, but according to the latest DOM L3 Events spec: https://dvcs.w3.org/hg/dom3events/raw-file/tip/html/DOM3-Events.html#event-type-DOMFocusIn > Warning! The DOMFocusIn event type is defined in this specification for reference and completeness, but this specification deprecates the use of this event type in favor of the related event types focus and focusin. So I suppose we should rename these events as focusin/focusout.
Note that Ian is trying to get all events removed other than focus/blur.
Moved to https://github.com/w3c/webcomponents/issues/195