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<!DOCTYPE html>
<script>
const ch = new BroadcastChannel('mathml_nav_test');
ch.postMessage(window.location.href);
ch.close()
window.close()
</script>
<!DOCTYPE html>
<script>
const ch = new BroadcastChannel('mathml_nav_test');
ch.postMessage(window.location.href);
ch.close()
window.close()
</script>