[dom] When iterator collection is set? (#86)

"Each NodeIterator object has an associated iterator collection , which is a collection rooted at root, whose filter matches any node."
https://dom.spec.whatwg.org/#iterator-collection

But when this collection should be setting, after creating NodeIterator, or in some steps in createNodeIterator() method (before return this object, but after setting root and filter)?
https://dom.spec.whatwg.org/#dom-document-createnodeiterator


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https://github.com/whatwg/dom/issues/86