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Test Info:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Masking: mask-position: mask positioning</title>
<link rel="author" title="Astley Chen" href="mailto:aschen@mozilla.com">
<link rel="author" title="Mozilla" href="https://www.mozilla.org">
<link rel="match" href="mask-position-3-ref.html">
<meta name="assert" content="Test checks whether positioning mask layer works correctly or not.">
<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>