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chromium/third_party/blink/web_tests/http/tests/security/referrer-policy-attribute-anchor-no-referrer-when-downgrade.html 

<!DOCTYPE html>
<html>
<head>
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <script src="/resources/get-host-info.js"></script>
</head>
<body>
    <a href="http://127.0.0.1:8000/security/resources/referrer-attr-anchor-target.html#no-referrer-when-downgrade"
       referrerpolicy="no-referrer-when-downgrade" id="click-me">click me</a>
    <script>
        if (window.location.origin != get_host_info().HTTPS_ORIGIN) {
            window.location = get_host_info().HTTPS_ORIGIN + window.location.pathname;
        } else {
            document.getElementById("click-me").click();
        }
    </script>
</body>
</html>