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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Masking: mask-image: data url mask</title>
<link rel="author" title="CJ Ku" href="mailto:cku@mozilla.com">
<style type="text/css">
div {
background-color: purple;
width: 50px;
height: 50px;
}
</style>
</head>
<body>
<div></div>
</body>
</html>