The NodeIterator.root read-only property represents the Node that is the root of what the NodeIterator traverses.
A Node.
const nodeIterator = document.createNodeIterator(
document.body,
NodeFilter.SHOW_ELEMENT,
{
acceptNode(node) {
return NodeFilter.FILTER_ACCEPT;
},
},
);
root = nodeIterator.root; // document.body in this caseNodeIterator.