chromium/third_party/blink/web_tests/external/wpt/content-security-policy/frame-ancestors/support/frame-in-frame.sub.html

<!DOCTYPE html>
<html>
<body>
    <script src='/resources/testharness.js'></script>
    <script src='/resources/testharnessreport.js'></script>
    <script src='/content-security-policy/frame-ancestors/support/frame-ancestors-test.sub.js'></script>

    <span id="escape">{{GET[policy]}}</span>

    <script>
        test = async_test("Testing a {{GET[child]}}-origin child with a policy of {{GET[policy]}} nested in a {{GET[parent]}}-origin parent");
        const policy = document.getElementById("escape").textContent;
        originFrameShouldBe("{{GET[child]}}", "{{GET[expectation]}}", policy);
    </script>
</body>
</html>