css/css-fonts/system-ui-ur.html

<!doctype html>
<html lang="ur">
<meta charset="utf-8">
<title>Tests that system-ui font-family works for Urdu</title>
<link rel="help" href="https://drafts.csswg.org/css-fonts/#system-ui-def">
<link rel="author" title="Jonathan Kew" href="mailto:jkew@mozilla.com">
<link rel="mismatch" href="system-ui-ur-notref.html">
<link rel="stylesheet" href="/fonts/ahem.css">
<style>
@font-face {
  font-family: noto-naskh;
  src: url(/fonts/noto/NotoNaskhArabic-regular.woff2),
       url(/fonts/noto/NotoNaskhArabic-regular.ttf);
  size-adjust: 50%; /* cause mismatch even if system-ui maps to Noto Naskh */
}
p {
  font-family: Ahem, system-ui, noto-naskh, serif;
  font-size: 4em;
}
</style>
<p>سلام</p>