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<!DOCTYPE html>
<meta charset="UTF-8">
<title>Collapsed border overflow in vertical-lr RTL composited table (reference)</title>
<style>
body { margin: 60px; }
div { display: inline-block; }
table {
writing-mode: vertical-lr;
direction: rtl;
border-collapse: collapse;
border: none;
}
td {
width: 40px;
height: 40px;
padding: 5px;
}
.thin td { border: 2px solid blue; }
.thick td { border: 40px solid orange; }
</style>
<div>
<table>
<tr class="thin"><td></td><td></td></tr>
<tr class="thick"><td></td><td></td></tr>
</table>
</div>