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chromium/third_party/blink/web_tests/external/wpt/content-security-policy/frame-ancestors/support/frame-ancestors.sub.html 

<!DOCTYPE html>
<html>
<body>
    <p>This is an IFrame sending a Content Security Policy header containing "frame-ancestors {{GET[policy]}}".</p>
    <script>
         // This is an IFrame sending a Content Security Policy header containing "frame-ancestors {{GET[policy]}}"
    </script>
</body>
</html>