[webcomponents] [Shadow DOM] Add Attributes section (#32)

PTAL!
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webcomponents/pull/32

-- Commit Summary --

  * [Shadow DOM] Add Attributes section

-- File Changes --

    M spec/shadow/index.html (21)

-- Patch Links --

https://github.com/w3c/webcomponents/pull/32.patch
https://github.com/w3c/webcomponents/pull/32.diff

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https://github.com/w3c/webcomponents/pull/32