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

As discussed in
https://github.com/w3c/webcomponents/issues/375

This adds a clarification about focus navigation order for
nodes distributed under a slot element.

Also added handling tabindex="-1" case.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webcomponents/pull/381

-- Commit Summary --

  * Proposed change for Focus Navigation

-- File Changes --

    M spec/shadow/index.html (23)

-- Patch Links --

https://github.com/w3c/webcomponents/pull/381.patch
https://github.com/w3c/webcomponents/pull/381.diff

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Reply to this email directly or view it on GitHub:
https://github.com/w3c/webcomponents/pull/381