[whatwg/dom] Editorial: add range's common ancestor (#608)

Fixes #56.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/608

-- Commit Summary --

  * Editorial: add range's common ancestor

-- File Changes --

    M dom.bs (52)

-- Patch Links --

https://github.com/whatwg/dom/pull/608.patch
https://github.com/whatwg/dom/pull/608.diff

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