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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">
#container {height: 2em; background: red}
#child1 {height: 1em; background: green}
#child2 {height: 1em; background: green}
</style>
</head>
<body>
<p>There should be no red.</p>
<div id="container">
<div id="child1"></div>
<div id="child2"></div>
</div>
</body>
</html>