[whatwg/dom] Define TreeNode mixin and add .closest() to more nodes (#883)

Fixes #161.

I will submit a WebKit patch as soon as WPT PR is merged and synced.
Given this change adds a nice feature without growing API surface area, I have high hopes of it being landed.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/883

-- Commit Summary --

  * Define TreeNode mixin and add .closest() to more nodes

-- File Changes --

    M dom.bs (78)

-- Patch Links --

https://github.com/whatwg/dom/pull/883.patch
https://github.com/whatwg/dom/pull/883.diff

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