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Test Info:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Masking: mask-composite: compose svg mask</title>
<link rel="author" title="CJ Ku" href="mailto:cku@mozilla.com">
<link rel="author" title="Mozilla" href="https://www.mozilla.org">
<link rel="match" href="mask-composite-1-ref.html">
<meta name="assert" content="Test checks that vector-mask-image can be composed correctly by different mask-composite value.">
<svg height="0">
<mask id="rectMask" x="0" y="0" width="100" height="100" >
<rect x="0" y="50" width="100" height="50" style="stroke:none; fill: #ffffff"/>
</mask>
</svg>
<style type="text/css">
div {
background-color: blue;
position: absolute;
margin: 0px;
padding: 0px;
width: 100px;
height: 100px;
top:10px;
mask-image: url(#rectMask),
url(#rectMask);
}
div.add {
left: 10px;
mask-composite: add;
}
div.subtract {
left: 120px;
mask-composite: subtract;
}
div.intersect {
left: 230px;
mask-composite: intersect;
}
div.exclude {
left: 340px;
mask-composite: exclude;
}
</style>
</head>
<body>
<div class="add"></div>
<div class="subtract"></div>
<div class="intersect"></div>
<div class="exclude"></div>
</body>
</html>