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<!DOCTYPE HTML>
<html>
<head>
<title>Testcase</title>
<style>
body {
margin: 0px;
padding: 0px;
}
#inner {
width: 100px;
height: 100px;
background: linear-gradient(red, blue) no-repeat;
background-position: -50px -50px;
background-size: 800px 800px;
}
#outer {
margin: 50px 50px 0;
width: 100px;
height: 100px;
clip-path: url(#path);
position: fixed;
}
</style>
</head>
<body>
<div id="outer">
<div id="inner"></div>
</div>
<svg height="0">
<defs>
<clipPath id="path" clipPathUnits="objectBoundingBox">
<polygon points="0.25,0.25 0.25,0.75 0.75,0.75 0.75,0.25"/>
</clipPath>
</defs>
</svg>
</body>
</html>