font-size-adjust-units-001-ref.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Fonts reference</title>
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<style>
  div {
    margin: 10px;
    font: 100px/1 Ahem;
    font-size-adjust: 0.8;  /* this matches Ahem's ex-height metric */
    background: orange;
    width: 2ch;
    height: 1ex;
  }
  #test1 {
    background: blue;
  }
  #test2 {
    background: blue;
  }
</style>
<body>
  <p>Test passes if the blue rectangles are both the same size as the orange one.</p>
  <div id="test1"></div>
  <div id="test2"></div>
  <div></div>
</body>

chromium/third_party/blink/web_tests/external/wpt/css/css-fonts/font-size-adjust-units-001-ref.html