Please refer to appendChild / replaceChild in the "set the value of a new
indexed property" algorithm for for HTMLOptionsCollection
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| Otherwise, replace the indexth element in the collection by value.
doesn't sound clear to me.
I've (indirectly, for now; see bug 12995) hyperlinked "replace" to the definition of "replace" in the DOM Core spec.
Checked in as WHATWG revision r7285.
Check-in comment: Clarify what 'replace' means for a node.