Bug ID: 27965
           Summary: [Shadow]: Shadow host with tabindex=-1, all descendent
                    tree should be ignored for tab navigation
           Product: WebAppsWG
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Component Model
        QA Contact:
            Blocks: 14978

In the current Shadow DOM spec, basically focusable nodes in a shadow tree are
inserted after their shadow host in the tab navigation order.

This means that when shadow host has "tabindex=-1", the host itself is skipped
in the order, but right after the host the descendant nodes in its shadow tree
will be visited.

This is probably not the behavior that a component author or user would expect.

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