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chromium/third_party/blink/renderer/core/testing/data/frameserialization/image_in_plugin.html 

<html>
<head>
<meta charset="utf8">
<title>Test Image in Plugin Element</title>
</head>
<body>
<object data="1x.png" ></object>
<embed src="2x.png"></embed>
</body>
</html>