layout/reftests/forms/button/1317351-ref.html


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<!DOCTYPE HTML>
<html><head>
  <meta charset="utf-8">
  <title></title>
  <style type="text/css">

html { padding: 100px }

mask {
  position: absolute;
  top: 98px; left: 98px;
  width: 300px;
  height: 200px;
  background: black;
}
  </style>
</head>
<body>
<mask></mask>
</body>
</html>