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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">
#outer {
border: 1px solid black;
width: 64px;
height: 128px;
}
#inner {
border: 20px solid white;
width: 24px;
height: 88px;
}
#innermost {
width: 24px;
height: 24px;
background-color: purple;
}
</style>
</head>
<body>
<div id="outer">
<div id="inner">
<div id="innermost"></div>
</div>
</div>
</body>
</html>