<!DOCTYPE html>
<!-- Test is tentative due to the following issues:
   - https://github.com/w3c/csswg-drafts/issues/6112
   - https://github.com/w3c/csswg-drafts/issues/6114
-->
<title>Tests the size-adjust descriptor of @font-face</title>
<link rel="help" href="https://drafts.csswg.org/css-fonts-5/#descdef-font-face-size-adjust">
<link rel="author" href="mailto:xiaochengh@chromium.org">
<link rel="match" href="size-adjust-tentative-ref.html">
<link rel="assert" title="size-adjust should resize all metrics of the font face">

<style>
@font-face {
  font-family: custom-font;
  src: local(Ahem), url(/fonts/Ahem.ttf);
  size-adjust: 50%;
  unicode-range: U+20, U+30-39; /* Digits and space */
}

.target {
  font-size: 20px;
  font-family: custom-font, sans-serif;
}

.square {
  display: inline-block;
  vertical-align: bottom;
  background-color: black;
  width: var(--l);
  height: var(--l);
}
</style>

<p>size-adjust should scale ascent and descent metrics in 'line-height: normal'.</p>
<div class="target">
  123<br>
  123<br>
  123
</div>

<p>In a text node with multiple fonts, size-adjust should only scale characters in the modified font. In the test case below, digits should be scaled, but not letters.</p>
<div class="target">
  123xxx
</div>

<p>In nested elements, size-adjust should be applied to each text segment independently. Both elements below should be scaled to 50% of their original sizes, respectively.</p>
<div class="target">
  123
  <div style="font-size: 200%">
    456
  </div>
</div>

<p>The computed 'font-size' value (i.e., 'em') should not be affected. But 'ex' should be scaled since it's measured from the actual glyph.</p>
<div class="target">
  <span class="square" style="--l: 1em"></span><span class="square" style="--l: 1ex"></span>
</div>