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chromium/chrome/test/data/downloads/download-a_zip_file_frame.html 

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html><head><title>Test Download Multiple files Infobar - Frame.</title>
<script>window.location.href = "a_zip_file.zip";</script>
</head>

<body>
<h2>This frame downloads a_zip_file.zip once.</h2>

</body>
</html>