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<html>
<head>
<title>Dummy test page</title>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8"></meta>
</head>
<body>
<h1>This tab will close</h2>
<script>
// We use half a second timeout because this can race in debug builds.
setTimeout( () => {
window.close();
}, 500);
</script>
</body>
</html>