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chromium/third_party/blink/web_tests/http/tests/inspector-protocol/resources/content-security-policy-issue-with-src-location.php 

<?php
header("Content-Security-Policy: style-src https://thirdparty.test/network/resources/;");
?>
<!DOCTYPE html>

<link rel="stylesheet" type="text/css" href="style.css">

<html>
    <body>
    </body>
</html>