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.

Yeah I presume that we would add new mutation signaling stuff for MutationObserver and whatever the equivalent is for custom elements (I'm not super familiar with either yet). I don't think that we should make new mutation events since they seem to be deprecated and people are interested in removing them from the web - I don't have historical context on this though. Right now I'm just trying to work through the relationship between this new proposed method and #808, which is interested in mutation events.
To clarify - when I say "mutation events," I am referring to this: https://developer.mozilla.org/en-US/docs/Web/Guide/Events/Mutation_events

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