<html>
<head>
    <style>
        div {
            border-width: 50px 0 0 0;
            margin: 10px;
            width: 50px;
            height: 50px;
            box-sizing: border-box;
            background-color: gray;
        }
        
        .one {
            width: 159px;
        }

        .two {
            width: 239px;
        }

        .three {
            width: 319px;
        }
        
        .vertical {
            border-width: 0 50px 0 0;
            width: 50px;
            display: inline-block;
        }
    </style>
</head>
<body>
    <div class="horizontal" style="width: 159px; -webkit-clip-path: inset(0 120px 0 0)"></div>
    <div class="horizontal" style="width: 239px; -webkit-clip-path: inset(0 110px 0 110px)"></div>
    <div class="horizontal" style="width: 319px; -webkit-clip-path: inset(0 200px 0 100px)"></div>

    <div class="vertical" style="height: 159px; -webkit-clip-path: inset(0 0 130px 0)"></div>
    <div class="vertical" style="height: 239px; -webkit-clip-path: inset(112px 0 112px 0)"></div>
    <div class="vertical" style="height: 319px; -webkit-clip-path: inset(102px 0 206px 0)"></div>
</body>
</html>