<!DOCTYPE html>
<html>
    <head>
        <style>
            .outer {
                width: 100px;
                height: 100px;
                -webkit-box-reflect: below 10px;
            }

            .inner {
                width: 100px;
                height: 100px;
                -webkit-box-reflect: right 10px;
                background-color: green;
                will-change: transform;
                -webkit-mask-image: linear-gradient(-45deg, black, transparent);
                mask-image: linear-gradient(-45deg, black, transparent);
            }
            
            .child {
                position: relative;
                top: 100px;
                left: 100px;
                width: 100px;
                height: 100px;
                background-color: blue;
            }
        </style>
    </head>
    <body>
        <p>You should see four mirrored square boxes with linear gradient green.</p>
        <div class="outer">
            <div class="inner">
                <div class="child">
                </div>
            </div>
        </div>
    </body>
</html>