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chromium/third_party/blink/web_tests/wpt_internal/css/css-fonts/size-adjust-ex-zoom-ref.html 

<!DOCTYPE html>
<title>size-adjust should scale 'ex' correctly under zoom</title>

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

.test {
  position: absolute;
  top: 0;
  left: 0;
  font-size: 60px;
}

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

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

<div class="test">

<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: 0.4ex"></span>
</div>

</div>