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chromium/third_party/blink/web_tests/http/tests/history/resources/check-referrer.html 

<!DOCTYPE html>
<html>
<head>
<script>
function log(msg) {
    document.getElementById("log").innerHTML += msg + "<br>";
}

function check() {
    if (document.referrer.indexOf("other.html") != -1)
        log("FAIL: incorrect referrer send: " + document.referrer);
    else
        log("PASS: correct referrer send");

    if (window.testRunner)
        testRunner.notifyDone();
}
</script>
</head>
<body onload="check()">
<p>
Tests that when navigating back from a history entry that was created by
history.pushState(), the outgoing referrer is correctly updated.
</p>
<div id="log"></div>
</body>
</html>