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chromium/third_party/blink/web_tests/external/wpt/css/css-fonts/system-ui-zh-notref.html 

<!doctype html>
<html lang="zh">
<meta charset="utf-8">
<title>CSS Test Reference</title>
<link rel="stylesheet" href="/fonts/ahem.css">
<style>
@font-face {
  font-family: mplus;
  src: url(/fonts/mplus-1p-regular.woff);
  size-adjust: 50%; /* cause mismatch even if system-ui maps to M+ */
}
p {
  font-family: Ahem, mplus, serif;
  font-size: 4em;
}
</style>
<p>&#x76F4;</p>