Re: [whatwg/dom] Atomic move operation for element reparenting & reordering (Issue #1255)

I'm also a bit at a loss as to why we'd discuss new attributes. That seems like a pretty severe layering violation? The way I see it:

1. https://dom.spec.whatwg.org/#mutation-algorithms needs to gain a new "move" operation that encapsulates argument validation, new mutation observer records, new callback steps for specifications to hook into, etc.
2. We figure out what API is best suitable for that new primitive, e.g., `parent.moveBefore(node, before)`. (Possibly multiple APIs, but best to start small and give it time to bake in multiple implementations.)

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