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chromium/chrome/test/data/extensions/api_test/mime_handler_view/test_embedded_data_url_embed.html 

<html>
<body>
<embed id="plugin" width="200" height="200" src="data:text/csv;base64,Y29udGVudCB0byByZWFkCg==" type="text/csv"></object>
</body>
</html>