<!DOCTYPE html>
<html>
<head>
    <style>
        .container {
            position: absolute;
            z-index: 1;
            left: 100px;
            height: 50px;
            width: 500px;
            border-radius: 0 25px 25px 0;
            background-color: silver;
            box-sizing: border-box;
            transform: translateZ(0);
        }

        .child {
            position: absolute;
            top: 20px;
            left: 20px;
            height: 50px;
            width: 220px;
            border: 4px solid green;
            padding: 10px;
            background-color: orange;
            transform: translateZ(0);
        }
    </style>
</head>
<body>
    <div class="container" style="top: 50px;">
        <div class="child">
            this element should not be clipped
        </div>
    </div>

    <div class="container" style="top: 200px; border-radius: 0px">
        &nbsp;
        <div class="child">
            this element should not be clipped
        </div>
    </div>

    <div class="container" style="top: 350px; overflow: hidden;">
        <div class="child">
            this element should be clipped
        </div>
    </div>

    <div class="container" style="top: 500px; overflow: hidden; border-radius: 0px">
        &nbsp;
        <div class="child">
            this element should be clipped
        </div>
    </div>
</body>
</html>