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Test Info:
<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8>
<style>
div { padding: 5px; display: inline-block; }
.vlr { writing-mode: vertical-lr; text-orientation: sideways; }
.vrl { writing-mode: vertical-rl; text-orientation: sideways; }
.slr { writing-mode: sideways-lr; }
.srl { writing-mode: sideways-rl; }
span { display: inline-block; block-size: 2em; vertical-align: middle; }
span:nth-child(1) { background: red; inline-size: 1em; }
span:nth-child(2) { background: orange; inline-size: 1.1em; }
span:nth-child(3) { background: yellow; inline-size: 1.3em; }
span:nth-child(4) { background: green; inline-size: 1.5em; }
span:nth-child(5) { background: blue; inline-size: 1.7em; }
span:nth-child(6) { background: indigo; inline-size: 1.9em; }
span:nth-child(7) { background: violet; inline-size: 2em; }
</style>
</head>
<body>
<p>All four columns should look the same:
<div dir=ltr class="vrl"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></div>
<div dir=ltr class="vlr"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></div>
<div dir=ltr class="srl"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></div>
<div dir=rtl class="slr"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></div>