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Test Info:
<!DOCTYPE html>
<html>
<head>
<style type="text/css">
.separator {
height: 20px;
background-color: green;
}
#min-height {
min-height: 0;
height: auto;
margin-top: 30px;
margin-bottom: 40px;
}
#margin-only-child {
margin-top: 10px;
margin-bottom: 20px;
}
</style>
</head>
<body>
<div class="separator"></div>
<div id="min-height">
<div id="margin-only-child"></div>
</div>
<div class="separator"></div>
</body>
</html>