mozilla-release/testing/web-platform/tests/content-security-policy/navigate-to/parent-navigates-child-allowed.html

<!DOCTYPE html>

<head>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>

<body>
<script>
  var t = async_test("Test that the parent can navigate the child because the relevant policy belongs to the navigation initiator (in this case the parent, which has the policy `navigate-to 'self'`)");
  window.onmessage = t.step_func_done(function(e) {
    assert_equals(e.data.result, 'success');
  });
  window.addEventListener('securitypolicyviolation', t.unreached_func("Should not have triggered a policy violation"));

  var i = document.createElement('iframe');
  var src_changed = false;
  i.onload = function() {
    if (src_changed) return;
    src_changed = true;
    i.src = "support/post_message_to_frame_owner.html";
  }
  i.src = "support/wait_for_navigation.html?csp=navigate-to%20%none%27";
  document.body.appendChild(i);
</script>
</body>