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Test Info:
<root>
<head>
<style type="text/css">
root, html, body {
display: block;
margin: 0; padding: 0;
}
html {
background-color: lightgreen;
margin: 20px 0;
}
body {
background-color: green;
margin: 10px 0;
height: 100px;
}
</style>
</head>
<body>
</body>
</html>
</root>