Bug 1852896 [wpt PR 41935] - Strictly enforce exclusive semantics for…

… <details name>., a=testonly

Automatic update from web-platform-tests
Strictly enforce exclusive semantics for <details name>.

This change thoroughly enforces that at most one <details> element in a
group established by the name attribute is open at a given time.   This
requires that we remove the open attribute during insertion into the DOM
in some cases, and also that we remove the open attribute for some
mutations of the name attribute.

This suppresses DOM mutation events (but not toggle events, which are
asynchronous) for the removals of the open attribute that result from
insertion.

This is based on discussion in (among other places):
openui/open-ui#786
openui/open-ui#812

Bug: 1444057
Change-Id: I91313662f6fb005b461717445a69294bcb4d1a59
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4829108
Reviewed-by: Mason Freed <masonfchromium.org>
Commit-Queue: David Baron <dbaronchromium.org>
Cr-Commit-Position: refs/heads/main{#1195601}

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wpt-commits: ed2370ffc32409636abc9ec49b9d48dd6c36fdcc
wpt-pr: 41935

UltraBlame original commit: 498104795074ebf17d5698b1ef637f97a544e8e7