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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Masking: mask-position: position mask layer image</title>
<link rel="author" title="Astley Chen" href="mailto:aschen@mozilla.com">
<style type="text/css">
#outer {
border: 1px solid black;
width: 120px;
height: 120px;
}
#inner1 {
margin-left: 35px;
margin-top: 0px;
width: 50px;
height: 50px;
background-color: purple;
}
#inner2 {
margin-left: 35px;
margin-top: 20px;
width: 50px;
height: 50px;
background-color: purple;
}
</style>
</head>
<body>
<div id="outer">
<div id="inner1"></div>
<div id="inner2"></div>
</div>
</body>
</html>