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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
<head>
<title>CSS Reference File</title>
<link rel="author" title="Bert Bos" href="mailto:bert@w3.org" />
<style type="text/css">
div {width: 5em; height: 2em}
/* absolute with 'z-index: auto' does not create a stacking context */
#absolute {position: absolute; left: 1em; top: 3em; background: green}
#absolute div {position: absolute}
#absolute div div {position: absolute; z-index: -1; background: green}
/* fixed with 'z-index: auto' *does* create a stacking context */
#fixed {position: fixed; left: 10em; top: 3em; background: green}
#fixed div {position: absolute}
#fixed div div {position: absolute; z-index: -1; background: green}
</style>
</head>
<body>
<p>There should be no red.</p>
<div id="absolute">
<div>
<div></div>
</div>
</div>
<div id="fixed">
<div>
<div></div>
</div>
</div>
</body>
</html>