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chromium/third_party/blink/web_tests/fast/frames/resources/sandboxed-iframe-plugins-frame-embed.html 

<html>
<head>
</head>

<body>
    <embed id="plugin" 
           type="application/x-webkit-test-webplugin"
           src="data:text/plain,"
           style="width:0; height:0">
    </embed>
</body>
</html>