[whatwg/dom] Use HTML's 'document base URL' concept. (#258)

This definition is more correct right now, and using a getter rather than a
mutable field makes it easier to figure out what is returned.

CC <https://github.com/whatwg/html/issues/421>.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/258

-- Commit Summary --

  * Use HTML's 'document base URL' concept.

-- File Changes --

    M dom.bs (9)
    M dom.html (9)

-- Patch Links --

https://github.com/whatwg/dom/pull/258.patch
https://github.com/whatwg/dom/pull/258.diff

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