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Test Info:

<!DOCTYPE html>
<meta charset="utf-8">
<title>TreeWalker: NodeFilter from detached iframe doesn't get called</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<div></div>
<script>
const t = async_test();
const iframe = document.createElement("iframe");
iframe.src = "support/TreeWalker-acceptNode-filter-cross-realm-null-browsing-context-subframe.html";
iframe.onload = t.step_func_done(() => {
const nodeIterator = iframe.contentWindow.createNodeIterator();
iframe.remove();
assert_equals(iframe.contentWindow, null);
let errorWasThrown = false;
try { nodeIterator.nextNode(); }
catch { errorWasThrown = true; }
assert_true(errorWasThrown);
assert_false(nodeIterator.dummyFilterCalled);
});
document.body.append(iframe);
</script>