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<html>
<head>
<style>
div {
width:10px;
height:10px;
background-color:green;
display: inline-block;
position: relative;
}
#wrapper {
opacity: 0.5;
width: 200px;
height: 200px;
background-color: transparent;
}
#first {
z-index: 1;
}
#second {
background-color: blue;
}
</style>
</head>
<body id="body">
<div id="wrapper">
<div id="first" class="reftest-no-display-list"></div><div id="second" class="reftest-no-display-list"></div>
</div>
</body>
</html>