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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">
<style type="text/css">
#outer {
border: 10px solid transparent;
width: 64px;
height: 128px;
background-clip: content-box;
background-color: purple;
}
</style>
</head>
<body>
<div id="outer"></div>
</body>
</html>