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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<h1>iframe</h1>
<script>
self.addEventListener('securitypolicyviolation', e => {
window.parent.postMessage({ violatedDirective: e.violatedDirective,
originalPolicy: e.originalPolicy, blockedURI: e.blockedURI });
});
</script>
</body>
</html>