<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Writing Modes Test Reference</title>
<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net/">
<style>
div {
  font-family: "Mongolian White";
  font-size: 2em;
  margin: 1em;
  writing-mode: vertical-lr;
  float: left;
}
div:nth-of-type(1) { text-orientation: sideways; }
div:nth-of-type(2) { text-orientation: sideways; }
</style>

<p>The test passes if you see two identical lines of vertical text (in Mongolian).

<div>ᠮᠣᠨᠭᠭᠣᠯ ᠬᠡᠯᠡ</div>
<div>ᠮᠣᠨᠭᠭᠣᠯ ᠬᠡᠯᠡ</div>