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chromium/third_party/blink/web_tests/http/tests/security/resources/referrer-policy-start.html 

<html>
<head>
<script>
function runTest() {
    var meta = document.createElement("meta");
    meta.name = "referrer";
    meta.content = document.location.search.substring(1);
    document.head.appendChild(meta);
    document.location =
        "http://127.0.0.1:8000/security/resources/referrer-policy-log.php";
}
</script>
</head>
<body onload="runTest()">
</body>
</html>