Re: [w3c/webcomponents] Algorithms in 6.3. Sequential Focus Navigation are too complex (#496)

FYI. Blink does not construct such a list, as an optimization.
As long as we can achieve the processing equivalence, it should be okay.

Yeah, the spec is complicated, however, the basic idea does not change from my comment: https://github.com/w3c/webcomponents/issues/375#issuecomment-178989178.

Hopefully, the example in the comment would be helpful.

If we are to define the behavior of this example in a normative way, we have to use such a list in the spec for the purpose of the normative explanation.

Ideally, we should have a spec which the UA can implement *literally*, but that can not be always easy.... :(


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