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chromium/third_party/blink/web_tests/external/wpt/css/css-writing-modes/reference/mongolian-span-001-ref.html 

<!DOCTYPE html>
<meta charset="utf-8">
<style>
html {
  writing-mode: vertical-lr;
  font-size: 50px;
}
</style>
<body>
  <div>ᠶᠠᠫᠣᠨ</div>
  <div>ᠶᠠᠫᠣᠨ</div>
</body>