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chromium/third_party/blink/web_tests/external/wpt/content-security-policy/navigate-to/form-redirected-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 child iframe navigation is allowed");
  window.onmessage = t.step_func_done(function(e) {
    assert_equals(e.data.result, 'success');
  });
</script>
<iframe src="support/form_action_navigation.sub.html?csp=navigate-to%20%27self%27&action=redirect_to_post_message_to_frame_owner.py%3Flocation%3Dpost_message_to_frame_owner.html"></iframe>
</body>