Only one shadow root can be attached to an element #33650
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Only one shadow root can be attached to an element. This documents what happens if you declare multiple
<template shadowrootmode="open">declarative shadow roots, or callattachShadow()to an existing shadow host.This is based on the spec here https://dom.spec.whatwg.org/#concept-attach-a-shadow-root
Fixes #32289
Part of docs for #32731