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chromium/third_party/blink/web_tests/external/wpt/html/browsers/browsing-the-web/navigating-across-documents/source/navigate-child-src-about-blank.html 

<!doctype html>
<meta charset=utf-8>
<title>Set the src attribute to about:blank and check referrer</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id=log></div>
<iframe></iframe>
<script>
  setup({
    single_test: true
  });
  onload = function() {
    var fr = document.querySelector("iframe")
    fr.src = "about:blank"
    fr.onload = function() {
      assert_equals(fr.contentDocument.referrer, document.location.origin + '/')
      done()
    }
  }
</script>