testing/web-platform/tests/css/css-masking/mask-image/mask-size-percent-percent-stretch-ref.html


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<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>CSS Masking: mask-size: mask layer size</title>
    <link rel="author" title="Astley Chen" href="mailto:aschen@mozilla.com">
    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
    <style type="text/css">
      div {
        width: 60px;
        height: 120px;
      }

      #outer {
        border: 10px solid black;
      }

      #inner {
        height: 60px;
        background-color: purple;
      }
    </style>
  </head>
  <body>
    <div id="outer">
      <div id="inner"></div>
    </div>
  </body>
</html>