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Showing content from https://developer.cdn.mozilla.net/en-US/docs/Web/API/XPathResult/invalidIteratorState below:

XPathResult: invalidIteratorState property - Web APIs

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Note: This feature is available in Web Workers.

The read-only invalidIteratorState property of the XPathResult interface signifies that the iterator has become invalid. It is true if XPathResult.resultType is UNORDERED_NODE_ITERATOR_TYPE or ORDERED_NODE_ITERATOR_TYPE and the document has been modified since this result was returned.

A boolean value indicating whether the iterator has become invalid.

The following example shows the use of the invalidIteratorState property.

<div>XPath example</div>
<p>Iterator state: <output></output></p>

const xpath = "//div";
const result = document.evaluate(
  xpath,
  document,
  null,
  XPathResult.ANY_TYPE,
  null,
);
// Invalidates the iterator state
document.querySelector("div").remove();
document.querySelector("output").textContent = result.invalidIteratorState
  ? "invalid"
  : "valid";

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