    <style type="text/css">
      div {
        width: 100px;
        height: 100px;
      }

      #outer {
        border: 1px solid black;
      }

      #inner {
        background-color: purple;
        mask-position: center 20%;
        mask-image: url(support/50x50-opaque-blue.svg);
        mask-repeat: no-repeat;
      }
    </style>
  </head>
  <body>
    <div id="outer">
      <div id="inner"></div>
    </div>
  </body>
</html>
