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Test Info:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style type="text/css">
div {
overflow: hidden;
height: 20px;
width: 300px;
background: red;
margin: 8px 0;
}
.h-tb { writing-mode: horizontal-tb; }
.v-lr { writing-mode: vertical-lr; }
.v-rl { writing-mode: vertical-rl; }
span {
float: left;
height: 21px;
width: 301px;
background: green;
}
</style>
</head>
<body>
<p>There should be 9 green bars</p>
<div class="h-tb"><span class="h-tb"></span></div>
<div class="h-tb"><span class="v-lr"></span></div>
<div class="h-tb"><span class="v-rl"></span></div>
<div class="v-lr"><span class="h-tb"></span></div>
<div class="v-lr"><span class="v-lr"></span></div>
<div class="v-lr"><span class="v-rl"></span></div>
<div class="v-rl"><span class="h-tb"></span></div>
<div class="v-rl"><span class="v-lr"></span></div>
<div class="v-rl"><span class="v-rl"></span></div>
</body>
</html>