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<!DOCTYPE html>
<script>
function createNodeIterator() {
function filter() {
nodeIterator.dummyFilterCalled = true;
return true;
}
const nodeIterator = parent.document.createNodeIterator(parent.document.body, NodeFilter.SHOW_ELEMENT, filter);
nodeIterator.dummyFilterCalled = false;
return nodeIterator;
}
</script>