Re: [webcomponents] Proposed change for Focus Navigation (#381)

I think you will not get a good definition by the current approach. I recommend you to have a more formal approach:

e.g.

algorithm:
- Input: a document composed tree
- Output: set of groups

algorithm:
- Input: node, NODE, in a document composed tree
- Output: a group which NODE belongs to

Thus, we can clearly define the disjoint sets. Then,

algorithm:
- Input: node A and node B where A nad B joins the same group
- Output: A or B, which comes before in the group

Thus, the *oder* is clearly defined.

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