[whatwg/dom] Mark more elements in browsing-context-less documents as "undefined" (#291)

This means in particular that they will not match :defined. Fixes https://github.com/w3c/webcomponents/issues/540.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/291

-- Commit Summary --

  * Mark more elements in browsing-context-less documents as "undefined"

-- File Changes --

    M dom.bs (3)

-- Patch Links --

https://github.com/whatwg/dom/pull/291.patch
https://github.com/whatwg/dom/pull/291.diff

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