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

<!DOCTYPE html>
<html class="reftest-wait">
<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: 20px;
}
#multi-column2 {
 display: none;
 margin: 20px 0;
}
#multi-column3 {
 margin-top: 20px;
}
</style>
<script type="text/javascript">
function test() {
 document.getElementById('multi-column2').style.display = 'block';
 document.documentElement.removeAttribute('class');
}
document.addEventListener('MozReftestInvalidate', test, false);
</script>
</head>
<body>
<div id="multi-column1"></div>
<div id="multi-column2"></div>
<div id="multi-column3"></div>
</body>
</html>