<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS test reference</title>
<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
<style>
div {
  font-size: 20px;
  color: transparent;
}

div:nth-of-type(1) { background: green; }
div:nth-of-type(2) { background: blue; }
div:nth-of-type(1),
div:nth-of-type(2) {
  writing-mode: vertical-rl;
  text-orientation: upright;
  height: 5ch;
  width: 5ch;
}
div:nth-of-type(3) {
  background: orange;
  height: 5ch;
  width: 5ch;
}
</style>
<body>
  <p>Test passes if there is a <strong>green square</strong> below, and if it is the <strong>same size as the blue</strong> one, not the orange one.
  <p>If any of the 3 colored shapes is not a square, or if the orange and blue squares are the same size, the test fails.
  <div></div>
  <div></div>
  <div></div>
</body>