We append a new node when it isn't a `div` or `p` (like when it's an `article`) with the same id which generate a DOM error "DOMElement::setAttribute(): ID blabla already defined".
Most the time, they can be usefull.
At least, it'll be a link to something unrelated. But we won't lose a link inside the content.
Also, adding some extra space.
Jeremy Benoist