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Test Info:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Masking: mask-position: mask positioning</title>
<link rel="author" title="Astley Chen" href="mailto:aschen@mozilla.com">
<link rel="author" title="Mozilla" href="https://www.mozilla.org">
<link rel="match" href="mask-position-6-ref.html">
<meta name="assert" content="Test checks whether positioning mask layer works correctly or not.">
<style type="text/css">
div {
width: 100px;
height: 100px;
}
.outer {
border: 1px solid black;
}
.outer > div {
background-color: purple;
mask-image: url(support/50x50-opaque-blue.svg);
mask-repeat: no-repeat;
}
#inner1 {
mask-position: left 20px bottom 0px;
}
#inner2 {
mask-position: left 40% bottom 0%;
}
#inner3 {
mask-position: right 60% bottom 0%;
}
#inner4 {
mask-position: right 30px bottom 0px;
}
</style>
</head>
<body>
<div class="outer"><div id="inner1"></div></div>
<div class="outer"><div id="inner2"></div></div>
<div class="outer"><div id="inner3"></div></div>
<div class="outer"><div id="inner4"></div></div>
</body>
</html>