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

@josepharhar Why shouldn't it fire a mutation event of a new type? If a new method is added specifically for moving elements around, they can't possibly fire that mutation without invoking that previously-unknown method anyways, so in theory, a page would have to have its contents updated to experience breakage.

Also, I would expect it to invoke a new hook within custom elements to notify it of nodes being reordered. (This is very useful info for them, BTW, as libraries like A-Frame don't use shadow roots to render their data but otherwise need to know layout order at all times.)

As for the rest, I agree.

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