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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/XPathResult/iterateNext below:

XPathResult: iterateNext() method - Web APIs

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The iterateNext() method of the XPathResult interface iterates over a node set result and returns the next node from it or null if there are no more nodes.

None.

The next Node within the node set of the XPathResult.

In case XPathResult.resultType is not UNORDERED_NODE_ITERATOR_TYPE or ORDERED_NODE_ITERATOR_TYPE, a DOMException of type TYPE_ERR is thrown.

If the document is mutated since the result was returned, a DOMException of type INVALID_STATE_ERR is thrown.

The following example shows the use of the iterateNext() method.

<div>XPath example</div>
<div>Tag names of the matched nodes: <output></output></div>

const xpath = "//div";
const result = document.evaluate(
  xpath,
  document,
  null,
  XPathResult.ANY_TYPE,
  null,
);
let node = null;
const tagNames = [];
while ((node = result.iterateNext())) {
  tagNames.push(node.localName);
}
document.querySelector("output").textContent = tagNames.join(", ");

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