[whatwg/dom] Use Infra to define mutation observers (#609)

Fixes #132.

The main thing I still need to look into is figuring out how transient registered observers are actually removed, as the current text doesn't state that in much detail.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/609

-- Commit Summary --

  * Use Infra to define mutation observers
  * more

-- File Changes --

    M dom.bs (383)

-- Patch Links --

https://github.com/whatwg/dom/pull/609.patch
https://github.com/whatwg/dom/pull/609.diff

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