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chromium/chrome/test/data/extensions/csp/success.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Success</title>
<script>
// The test checks that this is set in order to see if the page loaded
// successfully. The onload/onerror events on iframe are insufficient
// because onload fires even if the frame is blocked due to CSP,
// see https://crbug.com/365457.
window.scriptExecuted = true;
</script>