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chromium/third_party/blink/web_tests/external/wpt/dom/traversal/support/TreeWalker-acceptNode-filter-cross-realm-null-browsing-context-subframe.html 

<!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>