Re: [whatwg/dom] Explicitly update the child's parent (Issue #1221)

"Parent reference" isn't a concept in the spec. The parent-child relationship is _defined_ in https://dom.spec.whatwg.org/#trees ; if X is a child of Y, then Y _by definition_ is a parent of X. When your implementation is using a two-way pair of references as an implementation detail of tracking this relationship, it probably should set them both at the same time.

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