[whatwg/dom] Add pop-up light dismiss logic to event dispatching (PR #1117)

This was moved from the HTML spec PR for the popup attribute based on this advice: https://github.com/whatwg/html/pull/8221#discussion_r987585621

TODO add a better description

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- [ ] At least two implementers are interested (and none opposed):
   * Chrome
   * …
- [ ] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * https://wpt.fyi/results/html/semantics/popups

- [ ] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chrome: https://bugs.chromium.org/p/chromium/issues/detail?id=1307772

   * Firefox: …
   * Safari: …
   * Deno (only for aborting and events): …
   * Node.js (only for aborting and events): …

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


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<a href="https://whatpr.org/dom/1117.html" title="Last updated on Oct 10, 2022, 10:39 PM UTC (883112d)">Preview</a> | <a href="https://whatpr.org/dom/1117/c3ca964...883112d.html" title="Last updated on Oct 10, 2022, 10:39 PM UTC (883112d)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/1117


-- Commit Summary --

  * Add pop-up light dismiss logic to event dispatching

-- File Changes --

    M dom.bs (43)

-- Patch Links --

https://github.com/whatwg/dom/pull/1117.patch

https://github.com/whatwg/dom/pull/1117.diff


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