css/css-fonts/parsing/font-size-adjust-computed.html

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Fonts Module Level 5: getComputedStyle().fontSizeAdjust</title>
<link rel="help" href="https://www.w3.org/TR/css-fonts-5/#font-size-adjust-prop">
<meta name="assert" content="font-size-adjust computed value is as specified.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/computed-testcommon.js"></script>
<style>
/* Use a font with known metrics so we can verify that from-font
   computes to the expected value from the font. */
@font-face {
    font-family: ahem-ex-500;
    src: url(ahem-ex-500.otf);
}
#target {
    font-family: ahem-ex-500 !important;
    font-size: 1000px;
}
</style>
</head>
<body>
<div id="target"></div>
<script>
promise_test(async (t) => {
  await document.fonts.load("1000px ahem-ex-500");

  test_computed_value('font-size-adjust', 'none');

  test_computed_value('font-size-adjust', '0.5');
  test_computed_value('font-size-adjust', 'ex-height 0.5', '0.5');  // default basis 'ex-height' omitted from serialization
  test_computed_value('font-size-adjust', 'cap-height 0.8');
  test_computed_value('font-size-adjust', 'ch-width 0.4');
  test_computed_value('font-size-adjust', 'ic-width 0.9');
  test_computed_value('font-size-adjust', 'ic-height 1.1');

  // The ahem-ex-500 font has both ex-height and cap-height set at 0.5em, and ch-width is 1em.
  // Ideographic metrics are not available, so fall back to 1em.
  test_computed_value('font-size-adjust', 'from-font', '0.5');
  test_computed_value('font-size-adjust', 'ex-height from-font', '0.5');  // default basis 'ex-height' omitted from serialization
  test_computed_value('font-size-adjust', 'cap-height from-font', 'cap-height 0.5');
  test_computed_value('font-size-adjust', 'ch-width from-font', 'ch-width 1');
  test_computed_value('font-size-adjust', 'ic-width from-font', 'ic-width 1');
  test_computed_value('font-size-adjust', 'ic-height from-font', 'ic-height 1');
})
</script>
</body>
</html>