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chromium/third_party/blink/web_tests/external/wpt/html/browsers/windows/browsing-context-names/resources/report-is-top.html 

<!doctype html>
<meta charset="utf-8">
<script src="/common/PrefixedLocalStorage.js"></script>
<script>
var prefixedStorage = new PrefixedLocalStorageResource({
  close_on_cleanup: true
});
prefixedStorage.setItem('isTop', window === window.top);
prefixedStorage.setItem('name', window.name);
</script>