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> "The navigation order within a shadow tree must be computed as a list of focusable elements in tree order, and is called shadow tree navigation order. " I am afraid that this sentence is likely to be misleading: The navigation order is determined only by element's tree order and the value of *tabindex* is ignored. This is not true. We should make it clear.
Fixed in https://github.com/w3c/webcomponents/commit/ec0237d249c999a3046985a375cfb44e4926c50b