file_sendbeacon.html

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<!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>