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<!DOCTYPE html>
<title>Historical iframe helper</title>
<script>
try {
const xhr = new XMLHttpRequest();
xhr.open("GET", document.location.href, false);
xhr.send();
window.parent.postMessage({ result: "allowed" }, "*");
} catch (e) {
window.parent.postMessage({ result: "blocked", error: e.name }, "*");
}
</script>