mozilla-release/testing/web-platform/tests/content-security-policy/navigation/to-javascript-parent-initiated-parent-csp.html

<!DOCTYPE html>
<head>
<meta http-equiv="content-security-policy" content="script-src 'self' 'nonce-abc'">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<iframe src="support/frame-with-csp.sub.html"></iframe>
<div onclick="frames[0].location.href = 'javascript:parent.postMessage(\'executed\', \'*\')'" id="special_div"></div>
<script nonce='abc'>
  var t = async_test("Should not have executed the javascript url");
  frames[0].addEventListener('load', () => {
    window.onmessage = t.step_func(function(e) {
      if (e.data == "executed")
        assert_true(false, "Javascript url executed");
    });
    window.addEventListener('securitypolicyviolation', t.step_func_done(function(e) {
      assert_equals(e.blockedURI, 'inline');
      assert_equals(e.violatedDirective, 'script-src-attr');
    }));
    document.getElementById('special_div').click();
  });
</script>
</body>