css/css-values/ch-unit-011.html

<!DOCTYPE html>

  <meta charset="UTF-8">

  <title>CSS Values and Units Test: ch unit in height with 'text-orientation: upright'</title>

  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
  <link rel="help" href="https://www.w3.org/TR/css-values-3/#font-relative-lengths">
  <link rel="match" href="reference/ch-unit-011-ref.html">

  <meta name="assert" content="In this test, the ch unit is the advance height measure of the 0 (ZERO, U+0030) glyph.">

  <style>
  div
    {
      float: left;
      font-size: 80px; /* arbitrary font size */
      text-orientation: upright;
      writing-mode: vertical-rl;
    }

  div#test-blue
    {
      background-color: blue;
      height: 5ch;
      width: 1.8em;
    }

  div#reference-orange
    {
      background-color: orange;
      color: orange;
      line-height: 1.8; /* arbitrary line-height */
    }
  </style>

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

  <div id="test-blue"></div>

  <div id="reference-orange">00000</div>