<!doctype html>
<title>CSS writing mode test reference</title>
<meta charset=utf-8>
<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net/">
<style>
div {
  line-height: 1em;
  height: 1em;
  writing-mode: vertical-rl;
}
</style>

<p>This test passes if the word “ＰＡＳＳ” (without the quotation marks) appears below, written horizontally from left to right.
<div>Ｓ Ｓ Ａ Ｐ</div>