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<!doctype html>
<html>
<head><title>Document</title></head>
<body>
<h1>Document</h1>
<script>
window.addEventListener("load", function() {
window.addEventListener("visibilitychange", event => {
opener.postMessage({
target: event.target.nodeName,
state: document.visibilityState,
bubbles: event.bubbles
}, "*");
});
opener.postMessage("close", "*");
});
</script>
</body>
</html>