Re: [whatwg/dom] Proposal: ParentNode.empty() (#478)

@pkozlowski-opensource `removeChild()` in a loop will be slower since it doesn't use the https://dom.spec.whatwg.org/#concept-node-replace-all path and therefore ends up creating way more mutation records. `textContent = ""` and `innerHTML = ""` should be equivalent in performance however and should also be the fastest. If  that's not the case that'd be a bug of sorts. I would consider the latter two the current blessed way to remove all children (given the code path they take), but I can sympathize with the desire for a clearer endpoint.

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