Re: [whatwg/dom] Proposal: New method to reorder child nodes (#891)

> I don't think that discussion was really settled though. Those arguments would apply to moving within a parent as well as you have to contend with subtrees and multiple elements there too.

@rniwa [said](https://github.com/whatwg/html/issues/5484#issuecomment-619721168) that "Since a node can't have multiple parents, it needs to be disconnected at some point in some internal engine state. That's precisely what caused the problem."
When reordering children instead of reparenting them across the DOM, we will never have to change the pointer to the parent node, only the node's sibling pointers and the parent's first/last node pointers. @rniwa this does address your concern, right?

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