file_broadcastChanneliFrame.html

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<!DOCTYPE HTML>

<html>

<head>

  <meta http-equiv="content-type" content="text/html; charset=utf-8">

  <title>Page broadcast channel responder for first party isolation</title>

</head>

<body>

  <div id="display" style="white-space:pre; font-family:monospace; display:inline;"></div>

<script type="text/javascript">

let bc = new BroadcastChannel("testBroadcastChannel");

bc.onmessage = function(e) {

  window.parent.postMessage(e.data, "*");

};

</script>

</body>