Keep fiddling with replaceChild because that is the way to do it.
  1. Build a text-node containing the new content.
  2. Navigate to the parent node and instruct it to replaceChild the existing node with the new text-node.
Remember that the replacement node must be coined from the same document.

In reply to Re: Replacing an XPath node with the value of its content by Anonymous Monk
in thread Replacing an XPath node with the value of its content by stylechief

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