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chromium/third_party/blink/web_tests/external/wpt/html/browsers/windows/browsing-context-names/resources/choose-_top-003-iframe-1.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>HTML Test: browsing context name - top (case-insensitive)</title>
<script src="/common/PrefixedLocalStorage.js"></script>
<body>
</body>
<script>
var prefixedStorage = new PrefixedLocalStorageResource({
  close_on_cleanup: true
});
window.name = 'topWin';
var iframe = document.createElement('iframe');
iframe.src = prefixedStorage.url('choose-_top-003-iframe-2.html');
document.body.appendChild(iframe);
</script>