<style>
    .green-box {
        height: 400px;
        width: 400px;
        clip-path: inset(0 200px 200px 0);
    }
</style>
<body>
    <div>
        <svg class="green-box" viewBox="0 0 200 200">
            <rect width="100%" height="100%" fill="green"/>
        </svg>
    </div>
</body>