css/css-fonts/fallback-url-to-local.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>Test that font fallback from a pending web font to an available local font works.</title>
<link rel=help href="https://drafts.csswg.org/css-fonts-4/#font-matching-algorithm">
<link rel=help href="https://bugs.chromium.org/p/chromium/issues/detail?id=1101483">
<link rel=author href="mailto:xiaochengh@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
@font-face {
  font-family: remote-font;
  src: url("/fonts/Revalia.woff?pipe=trickle(d1)") format(woff);
}

@font-face {
  font-family: local-font;
  src: local(Ahem);
}

#target {
  font: 25px/1 remote-font, local-font, monospace;
}
</style>
<span id="target">0123456789</span>
<script>
test(() => {
  assert_false(document.fonts.check('25px/1 remote-font'));
  assert_equals(target.offsetWidth, 250);
}, 'We should use the local font to render the page when the primary remote font is loading');
</script>