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<!DOCTYPE HTML>
<html>
<body>
<script>
if (('localStorage' in window) && window.localStorage !== null) {
try {
localStorage.setItem("name", "user1");
localStorage.setItem("name", "user2");
} catch (e) {
window.opener.postMessage({error: "setItem method is failed."}, '*');
}
localStorage.clear();
} else {
window.opener.postMessage({error: "localStorage is not supported."}, '*');
}
</script>
</body>
</html>