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<!DOCTYPE html>
<html>
<head>
<style type="text/css">
div {
background-color: blue;
position: absolute;
margin: 0px;
padding: 0px;
width: 100px;
height: 100px;
top: 10px;
}
div.auto {
left: 10px;
mask-mode: match-source;
mask-image: -moz-element(#blue-bg);
}
div.alpha {
left: 120px;
mask-mode: alpha;
mask-image: -moz-element(#blue-bg);
}
div.luminance1 {
left: 230px;
mask-mode: luminance;
mask-image: -moz-element(#blue-bg);
}
div.luminance2 {
left: 340px;
mask-mode: luminance;
mask-image: -moz-element(#red-bg);
}
div.luminance3 {
left: 450px;
mask-mode: luminance;
mask-image: -moz-element(#lime-bg);
}
</style>
</head>
<body>
<div class="auto"></div>
<div class="alpha"></div>
<div class="luminance1"></div>
<div class="luminance2"></div>
<div class="luminance3"></div>
<div style="overflow:hidden; height:0;">
<div id="blue-bg" style="width:100px; height:100px; background-color: blue;"> </div>
</div>
<div style="overflow:hidden; height:0;">
<div id="red-bg" style="width:100px; height:100px; background-color: red;"></div>
</div>
<div style="overflow:hidden; height:0;">
<div id="lime-bg" style="width:100px; height:100px; background-color: lime;"></div>
</div>
</body>
</html>
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