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Test Info:

<!DOCTYPE html>
<html>
<head>
<title>Bug 1122366 - margin collapsing</title>
<style type="text/css">
div {
font: 40px/1em serif;
height: 4em;
}
div.wrapper {
margin: 10px;
background: blue;
border-left: green solid .5em;
border-right: green solid 1.5em;
}
div.lr {
-webkit-writing-mode: vertical-lr;
writing-mode: tb-lr; /* IE11 */
writing-mode: vertical-lr;
}
div.rl {
-webkit-writing-mode: vertical-rl;
writing-mode: tb-rl; /* IE11 */
writing-mode: vertical-rl;
}
div.widthless
{
margin-right: 2em;
width: 0;
}
</style>
</head>
<body>
<div class="wrapper lr">
<div class="widthless"></div>
<div class="widthless"></div>
</div>
<div class="wrapper rl">
<div class="widthless"></div>
<div class="widthless"></div>
</div>
</body>
</html>