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chromium/third_party/blink/web_tests/external/wpt/html/browsers/windows/browsing-context-names/choose-default-002.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>HTML Test: Browsing context names - empty string</title>
<link rel="author" title="Intel" href="http://www.intel.com/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
async_test(t => {
  window.addEventListener('message', t.step_func_done(e => {
    assert_equals(e.data.isTop, false);
    assert_equals(e.data.name, 'hellothere', 'Empty-string browsing context should choose current context');
  }), false);
}, 'The current browsing context must be chosen if the given name is empty string');
</script>
<iframe name="hellothere" src="resources/choose-default-002-iframe.html"></iframe>