[whatwg/dom] Treat fragment parser documents as not connected (PR #1474)

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Matching the behaviour of engines. For: https://github.com/whatwg/html/issues/11023, but needs a small patch in HTML spec also, which I will raise if directionally this is okay.

- [x] At least two implementers are interested (and none opposed):
   * Chromium (already implements)
   * Webkit (already implements)
   * Firefox (already implements)
- [x] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * https://github.com/web-platform-tests/wpt/blob/0d0249113dc429fbbb4fce7778caeceae0466739/domparsing/createContextualFragment.html#L85
   * https://github.com/web-platform-tests/wpt/blob/0d0249113dc429fbbb4fce7778caeceae0466739/html/semantics/forms/the-input-element/radio-disconnected-group-owner.html#L186
- [x] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chromium: N/A
   * Gecko: N/A
   * WebKit: N/A
   * Deno (only for aborting and events): …
   * Node.js (only for aborting and events): …
- [x] [MDN issue](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) is filed: N/A
- [x] The top of this comment includes a [clear commit message](https://github.com/whatwg/meta/blob/main/COMMITTING.md) to use. <!-- If you created this PR from a single commit, Github copied its message. Otherwise, you need to add a commit message yourself. -->

(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/1474

-- Commit Summary --

  * Treat fragment parser documents as not connected

-- File Changes --

    M dom.bs (13)

-- Patch Links --

https://github.com/whatwg/dom/pull/1474.patch
https://github.com/whatwg/dom/pull/1474.diff

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