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

<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>HTML Test: browsing context name - Empty string</title>
<link rel="author" title="Intel" href="http://www.intel.com/">
<body onload="followLink()">
</body>
<script>
function followLink() {
  var a = document.createElement('a');
  a.href = 'post-to-top.html';
  a.target = ''; // Target is empty string
  document.body.appendChild(a);
  a.click();
}
</script>
</html>