<!DOCTYPE html>
<html lang="en">
<head>
<style>
    .wrapper {
        width: 200px;
        height: 200px;
        border: 1px solid black;
    }
    .box {
        width: 200px;
        height: 200px;
        background-color: green;
        overflow: hidden;
        -webkit-clip-path: url(#MaskTest);
    }
    
    .child-box {
        width: 100%;
        height: 100%;
        background-color: red;
        transform: translate(100px, 0);
    }
</style>
</head>
<body>
    <svg height="0" width="0">
        <clipPath id="MaskTest" clipPathUnits="objectBoundingBox" transform="scale(0.005, 0.005)">
            <path d="M0,0 L100,0 L100,100 L0,100 L0,0 z"/>
        </clipPath>
    </svg>
    <div class="wrapper">
        <div class="box">
            <div class="child-box"></div>
        </div>
    </div>
</body>
</html>