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chromium/third_party/blink/web_tests/external/wpt/content-security-policy/navigation/to-javascript-url-frame-src.html 

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<meta http-equiv="Content-Security-Policy" content="frame-src 'none'">

<body>

<script>
  var t = async_test("<iframe src='javascript:...'> not blocked by 'frame-src'");

  var i = document.createElement('iframe');
  i.src = "javascript:window.top.t.done();";

  document.body.appendChild(i);
</script>