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<html>
<head>
<script>
const getDirectoryAndPost = () => {
navigator.storage.getDirectory().then(() => {
window.parent.postMessage("ok", document.referrer);
}).catch(e => {
window.parent.postMessage(e.message, document.referrer);
});
};
</script>
</head>
<body onload="getDirectoryAndPost()">
</body>
</html>