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Test Info:

<!DOCTYPE HTML>
<html>
<head>
<title>CSS 2.1 Test Suite: z-index</title>
<link rel="author" title="Robert O'Callahan" href="mailto:robert@ocallahan.org" />
<link rel="author" title="Mozilla Corporation" href="http://mozilla.com/" />
<meta name="flags" content="" />
<style>
.container {
position:absolute;
width:400px;
height:100px;
font-size:0;
background-color:yellow;
line-height:0;
z-index:0;
}
.container > div {
height:100px;
margin-bottom:-100px;
}
.negative {
width:380px;
background-color:blue;
position:relative;
z-index:-1;
}
.block {
width:360px;
background-color:purple;
}
.float {
float:left;
width:340px;
margin-right:-340px;
background-color:green;
}
.inline {
width:320px;
display:inline-block;
background-color:pink;
}
#outline {
width:300px;
outline:20px solid gray;
outline-offset:-20px;
}
.positioned {
width:280px;
background-color:magenta;
position:relative;
}
.positive {
width:260px;
background-color:orange;
position:relative;
z-index:1;
}
</style>
</head>
<body>
<div class="container">
<div class="positive"></div>
<div class="positioned"></div>
<div id="outline"></div>
<div class="inline"></div>
<div class="float"></div>
<div class="block"></div>
<div class="negative"></div>
</div>
</body>
</html>