<!DOCTYPE html>
<html>
<head>
    <title>CSS Filters Animation: Drop Shadow Reference</title>
    <link rel="author" title="Gunther Brunner" href="mailto:takeshimiya@gmail.com">
    <link rel="reviewer" title="Dirk Schulze" href="mailto:dschulze@adobe.com">
    <link rel="reviewer" title="Rebecca Hauck" href="mailto:rhauck@adobe.com">
    <style type="text/css">
        .square {
            width: 100px;
            height: 100px;
            background: blue;
            filter: drop-shadow(15px 15px 0px rgba(0, 0, 0, 0.5));
        }
    </style>
</head>
<body>
<p>You should see a blue rectangle in top of a gray one.</p>
<div class="square"></div>
</body>
</html>