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The current definition of focus navigation is incomplete. We have to rewrite that as follows (my rough idea): - Don't use 'as-rendered' tree. It's gone. - We cannot use a composed tree here, which does not have a scope. - Use a 'tree of trees' to define a scope of focus navigation and it's sequential order. - To skip a node which does not participate in the composed tree, introduce a concept of 'inert'.
Fixed. Now the case of multiple shadow roots are clearly defined. https://dvcs.w3.org/hg/webcomponents/rev/e81f3753b4bd