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<!DOCTYPE HTML>
<html>
<head>
<style>
.wackeddiv {
position: absolute;
left: 20px;
top: 20px;
width: 50px;
height: 50px;
border: 2px solid highlight;
background-color: transparent;
}
.posabssemitransparentblack {
position:absolute;
left: 0px;
top: 50px;
width: 100px;
height: 100px;
background: lime;
opacity: 0.1;
}
</style>
</head>
<body>
<div class="posabssemitransparentblack"></div>
<div class="wackeddiv"></div>
</body>
</html>