chromium/chrome/test/data/popup_blocker/popup-referrer.html

<html>
<head>
<meta name="referrer" content="origin"/>
<title>
  Check that the referrer is correctly set when opening a blocked popup
</title>
<script>
function test() {
  window.open("check-referrer.html");
}
</script>
</head>
<body onload="test()">
pop-up test page
</body>
</html>