<!DOCTYPE html>
<html lang="en">
<head>
<style>
#d {
    position: absolute;
    top: 20px;
    left: 20px;
    width: 180px;
    height: 180px;
    background-color: blue;
    box-sizing: border-box;
    zoom: 2;
}

#clip {
    width: 160px;
    height: 160px;
    margin: 10px;
    background-color: green;
    clip-path: url(#c2);
}
</style>
</head>
<body>
<svg height="100" width="100">
<clipPath id="c2" clipPathUnits="objectBoundingBox">
  <rect x="0.25" y="0.25" width="0.5" height="0.5"/>
</clipPath>
</svg>

<div id="d"><div id="clip"></div></div>
</body>
</html>