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<!DOCTYPE html>
<title>Reference</title>
<style>
.container {
writing-mode: vertical-rl;
width: 300px;
height: 200px;
}
.ref {
writing-mode: horizontal-tb;
width: 150px;
height: 50px;
background: green;
}
</style>
<p>Test passes if there is a 150x50 green rectangle.</p>
<div class="container">
<div class="ref"></div>
</div>