<meta http-equiv="Content-Security-Policy" content="upgrade-insecure-requests">
<body onload="loaded()">
<audio src="http://127.0.0.1:8443/resources/test.mp4"></audio>
<video src="http://127.0.0.1:8443/resources/test.mp4"></video>
<script>
function loaded() {
    if (window.opener)
        window.opener.postMessage('done', '*');
}
</script>
</body>