[whatwg/dom] Shadow: Define "in the same shadow-including document" (#273)

The definition is intended to be used in https://github.com/w3c/pointerlock/pull/4.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/273

-- Commit Summary --

  * Shadow: Define "in the same shadow-including document"

-- File Changes --

    M dom.bs (4)
    M dom.html (117)

-- Patch Links --

https://github.com/whatwg/dom/pull/273.patch
https://github.com/whatwg/dom/pull/273.diff

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https://github.com/whatwg/dom/pull/273