gecko-dev/dom/security/test/csp/file_sendbeacon.html

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HTML

<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="Content-Security-Policy" content= "connect-src 'none'">
<title>Bug 1234813 - sendBeacon should not throw if blocked by Content Policy</title>
</head>
<body>
<script type="application/javascript">
try {
navigator.sendBeacon("http://example.com/sendbeaconintonirvana");
window.parent.postMessage({result: "blocked-beacon-does-not-throw"}, "*");
}
catch (e) {
window.parent.postMessage({result: "blocked-beacon-throws"}, "*");
}
</script>
</body>
</html>