chromium/third_party/blink/web_tests/fast/css/transformed-mask.html

<!DOCTYPE html>
<html>
<head>
    <style type="text/css" media="screen">
        .box {
            height: 100px;
            width: 100px;
            background-color: black;
            display: inline-block;
            margin: 20px;
            -webkit-box-reflect: below 0px linear-gradient(transparent, rgba(0, 0, 0, 0.2));
        }

        .transformed {
            transform: rotate(10deg);
        }

        .transformed2 {
            transform: skewX(10deg);
        }
        
    </style>
</head>
<body>
    <p>You should not see any pixel artifacts around the reflections.</p>
    <div class="box"></div>
    <div class="transformed box"></div>
    <div class="transformed2 box"></div>
</body>
</html>