[whatwg/dom] "Append mo to unit of related similar-origin bro..." (#720)

https://dom.spec.whatwg.org/commit-snapshots/23ec6421f47ab629bd14dfc6d4910414dc443d0b/#ref-for-list-append⑦


> Append mo to unit of related similar\-origin browsing contexts' mutation observer list\. 

If my understanding is correct, this should be held as a weak pointer, not the traditional strong pointer. Otherwise, `MutationObserver` objects can never be garbage collected.

This probably deserves at least a note in the spec. Or, you could change the list to "weak set", as is done for https://html.spec.whatwg.org/multipage/webappapis.html#outstanding-rejected-promises-weak-set . Or we could start formalizing this concept of reference graphs in Infra.

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