[whatwg/dom] Correct MutationObserver ownership story (PR #1160) from Anne van Kesteren on 2023-02-13 (public-webapps-github@w3.org from February 2023)

From: Anne van Kesteren <notifications@github.com>
Date: Mon, 13 Feb 2023 09:24:06 -0800
To: whatwg/dom <dom@noreply.github.com>
Cc: Subscribed <subscribed@noreply.github.com>
Message-ID: <whatwg/dom/pull/1160@github.com>

The existing design had some leaks and was also different from implementations. In particular, assume you have two mutation observers and a change triggered the first one as well as a slot change. Then if in the reaction to the first one a further change triggers the second one it would run before the slot change per the existing specification, but that didn&#39;t match implementations and more importantly didn&#39;t allow for garbage collection.

Test: https://github.com/web-platform-tests/wpt/blob/master/shadow-dom/slotchange-event.html#L540-L594.

Fixes #713. Fixes #1159. Closes #720.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/1160

-- Commit Summary --

  * Correct MutationObserver ownership story

-- File Changes --

    M dom.bs (34)

-- Patch Links --

https://github.com/whatwg/dom/pull/1160.patch
https://github.com/whatwg/dom/pull/1160.diff

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Received on Monday, 13 February 2023 17:24:18 UTC