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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<title>z-index</title>
<style type="text/css">
div {
position: absolute;
}
</style>
</head>
<body>
<div style="background: #fff; opacity: 0.8; border: 6px solid red; z-index: 3; padding: 3em; top: 3em; left: 2em; width: 6em;">
z-index: 3, order: 1
</div>
<div style="background: #fff; opacity: 0.8; border: 6px solid green; z-index: 2; padding: 3em; top: 6em; left: 6em; width: 6em;">
z-index: 2, order: 2
</div>
<div style="background: #fff; opacity: 0.8; border: 6px solid blue; z-index: 1; padding: 3em; top: 1em; left: 4em; width: 6em;">
z-index: 1, order: 3
</div>
<div style="background: #fff; opacity: 0.8; border: 6px solid red; z-index: auto; padding: 3em; top: 23em; left: 2em; width: 6em;">
z-index: auto, order: 1
</div>
<div style="background: #fff; opacity: 0.8; border: 6px solid green; z-index: auto; padding: 3em; top: 26em; left: 6em; width: 6em;">
z-index: auto, order: 2
</div>
<div style="background: #fff; opacity: 0.8; border: 6px solid blue; z-index: auto; padding: 3em; top: 21em; left: 4em; width: 6em;">
z-index: auto, order: 3
</div>
</body>
</html>
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