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chromium/third_party/blink/web_tests/external/wpt/content-security-policy/support/file-prefetch-allowed.html 

<!DOCTYPE html>
<html>
<head>
  <!-- CSP directive 'prefetch-src' is not supported via meta tag though -->
  <meta http-equiv="Content-Security-Policy" content="prefetch-src 'self'">
</head>
<body>
</body>
</html>