Re: [w3c/webcomponents] Focus delegation from shadow host should not behave like sequential focus navigation (#830)

> > Could you elaborate what you mean by this? Are you suggesting that we should define an order of focusable areas and then UA would pick the first element in which it deems focusable under that ordering? That does sound like a reasonable approach.
>
> I think this approach is good. The set of things would be all the focusable elements in the host's shadow tree (and slotted ones too). Maybe the ordering will be flat-tree order, like the one suggested in the original post? Then the UA can use their own mechanisms (like skipping options). What do you think?

But defining the order here doesn't help if UA could skip any element because we're picking exactly one element here. Let's say we have elements: e_1, e_2, etc... e_n inside a shadow tree. If UA wanted to focus an element e_c because it happens to be the first element in flat tree order, or because it's the first in tab index order, then UA can just skip e_1 through e_(c-1) and always pick e_c. Put it another way, for any sequence sequence S_1 and S_2 each consisting of all elements of a set {e_1, e_2, ... e_n}, you can pick k ∈ ℤ: 1 ≤ k ≤ n such that k-th element in S_1 is the first element in S_2. So defining the order then letting UA skip any element would not result in any more specific definition than saying it's entirely UA dependent.

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