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chromium/third_party/blink/web_tests/http/tests/security/referrer-policy-attribute-img-origin-when-crossorigin.html 

<!DOCTYPE html>
<html>
<head>
</head>
<body>
    <img src="http://localhost:8000/security/resources/green-if-referrer-is-origin.php"
         referrerpolicy="origin-when-crossorigin" />
    <img src="resources/green-if-referrer-is-full-url-origin-when-crossorigin.php"
         referrerpolicy="origin-when-crossorigin" />
</body>
</html