Re: [dom] Fix the adoption step when replacing node by child into parent (#121)

Oh, I see you're a Servo developer. Without any context I assumed you were trying to build a polyfill or something.

Since it looks like existing implementations aren't precisely in sync with the spec, can you list what the mutation records would be per spec with and without this change? I see there's a "Queue a mutation record" step at the end, and wonder if there will still be duplicate records in the general case, where both the adopt step is run?

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