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Test Info:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Masking: mask-clip: clip mask image</title>
<link rel="author" title="Mozilla" href="https://www.mozilla.org">
<link rel="match" href="mask-clip-3-ref.html">
<meta name="assert" content="fill-box, stroke-box, view-box of mask-clip should clip to the appropriate boxes.">
<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;
}
div.mask {
mask-size: 100% 100%;
mask-origin: border-box;
mask-image: url(support/transparent-100x50-blue-100x50.svg);
}
div.stroke {
left: 10px;
mask-clip: stroke-box; /* should be the same as border-box */
}
div.view {
left: 110px;
mask-clip: view-box; /* should be the same as border-box */
}
div.fill {
left: 210px;
mask-clip: fill-box; /* should be the same as content-box */
}
</style>
</head>
<body>
<div class="outer mask stroke"></div>
<div class="outer mask view"></div>
<div class="outer mask fill"></div>
</body>
</html>