[whatwg/dom] fix: Use `HTMLDocument` where applicable (#799)

See issues: <https://github.com/whatwg/html/issues/4792>, <https://github.com/whatwg/dom/issues/221> and <https://github.com/whatwg/dom/issues/278>


Depends on <https://github.com/whatwg/html/pull/5104>


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review?(@annevk, @domenic)
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/799


-- Commit Summary --

  * fix: Use `HTMLDocument` where applicable

-- File Changes --

    M dom.bs (9)

-- Patch Links --

https://github.com/whatwg/dom/pull/799.patch

https://github.com/whatwg/dom/pull/799.diff


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