[whatwg/dom] Add a BoundaryPointsRange mixin (PR #1469)

This allows AbstractRange to be empty so it can be the superclass of OpaqueRange (which won't expose its boundary points).


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

  https://github.com/whatwg/dom/pull/1469

-- Commit Summary --

  * Add a BoundaryPointsRange mixin

-- File Changes --

    M dom.bs (45)

-- Patch Links --

https://github.com/whatwg/dom/pull/1469.patch
https://github.com/whatwg/dom/pull/1469.diff

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