firefox/testing/web-platform/tests/css/css-values/reference/ic-unit-009-ref.html

<!DOCTYPE html>

  <meta charset="UTF-8">

  <title>CSS Values and Units Test Reference File</title>

  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">

  <style>
  @font-face
    {
      font-family: IcTestFullWidth;
      src: url(/css/css-values/resources/IcTestFullWidth.woff2);
    }

  div
    {
      float: left;
      font-family: IcTestFullWidth;
      font-size: 80px; /* arbitrary font size */
      line-height: 1.8; /* arbitrary line-height */
      writing-mode: vertical-rl;
    }

  div#blue
    {
      background-color: blue;
      color: blue;
    }

  div#orange
    {
      background-color: orange;
      color: orange;
    }
  </style>

  <p>Test passes if there is a blue rectangle with the <strong>same height</strong> as an orange rectangle.

  <div id="blue">&#27700;&#27700;&#27700;&#27700;&#27700;</div>

  <div id="orange">&#27700;&#27700;&#27700;&#27700;&#27700;</div>

  <!--

  水 (CJK water ideograph, U+6C34) glyph == &#27700;

  水 (CJK water ideograph, U+6C34) glyph == &#x6C34;

  -->