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Shadow DOM specification reads (https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#focus-navigation) "The navigation order within a shadow tree must be computed as a list of focusable elements in tree order as-rendered, with the exception of any elements, distributed its insertion points, and is called shadow DOM navigation order.". First, seems that correct wording should be "...distributed INTO insertion points...". Second, it's unclear how exceptional elements should behave. What navigation order should be for these elements (distributed into insertion points)?
http://dvcs.w3.org/hg/webcomponents/rev/e40ea84f426c