chromium/third_party/blink/web_tests/external/wpt/css/css-fonts/size-adjust-unicode-range-system-fallback-ref.html

<!DOCTYPE HTML>
<meta charset="utf-8">
<link rel="author" href="mailto:[email protected]">
<title>Tests that the size-adjust descriptor does not affect system fallback font size.</title>
<style>
@font-face {
  font-family: large-font;
  src: local(Ahem), url(/fonts/Ahem.ttf);
  size-adjust: 1000%;
  unicode-range: U+0020;
}

.space {
  font-family: large-font;
}

.ref {
  font-family: sans-serif;
}
</style>
<span class="space"> </span><span class="ref">あ</span>