[whatwg/dom] .replaceWith specification question (#502)

I'm trying to implement https://dom.spec.whatwg.org/#dom-childnode-replacewith in [jsdom](https://github.com/tmpvar/jsdom/pull/1947)

1. Let parent be context object’s parent.

and later:

5. If context object’s parent is parent, ...

Isn't there an issue here? it seems the 5. is always true, or I'm not understanding it well

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