gecko/layout/reftests/margin-collapsing/column-sibling-2a.html

<!DOCTYPE html>
<html>
<head>
<style type="text/css">
#multi-column1, #multi-column2, #multi-column3 {
 -moz-column-count: 1;
 column-count: 1;
 height: 20px;
 background-color: blue;
}
#multi-column1 {
 margin-bottom: 10px;
}
#multi-column2 {
 margin: 20px 0;
}
#multi-column3 {
 margin-top: 10px;
}
</style>
</head>
<body>
<div id="multi-column1"></div>
<div id="multi-column2"></div>
<div id="multi-column3"></div>
</body>
</html>