[whatwg/dom] Add flat tree parent definition (PR #1223)

This can be used in the HTML spec as suggested in this issue: https://github.com/whatwg/html/issues/8970

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

  https://github.com/whatwg/dom/pull/1223

-- Commit Summary --

  * Add flat tree parent definition

-- File Changes --

    M dom.bs (14)

-- Patch Links --

https://github.com/whatwg/dom/pull/1223.patch
https://github.com/whatwg/dom/pull/1223.diff

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