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chromium
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chromium/third_party/blink/web_tests/http/tests/navigation/location-navigate-iframe-with-base-target.html 

<body>
PASS
<iframe id="i" src="resources/location-navigate-iframe-with-base-target-iframe.html"></iframe>
<script>
if (window.testRunner)
  testRunner.dumpAsText();

var navigated = false;
i.onload = function() {
  if (navigated)
    return;
  navigated = true;
  i.contentWindow.location = "resources/blank.txt";
}
</script>