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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style type="text/css">
div.outer {
/*
* content box: 40 x 20
* padding box: 52 x 38
* border box: 60 x 50
* margin box: 66 x 54
*/
background-color: purple;
position: absolute;
top: 10px;
margin: 1px 2px 3px 4px;
border: solid transparent;
border-width: 8px 2px 4px 6px;
padding: 6px 9px 12px 3px;
width: 40px;
height: 20px;
mask-size: 100% 100%;
mask-image: url(support/transparent-100x50-blue-100x50.svg);
}
div.first {
left: 10px;
mask-origin: border-box;
}
div.second {
left: 110px;
mask-origin: border-box;
}
div.third {
left: 210px;
mask-origin: content-box;
}
</style>
</head>
<body>
<div class="outer mask first"></div>
<div class="outer mask second"></div>
<div class="outer mask third"></div>
</body>
</html>