text-emphasis-unrepresentable-characters.html

<!DOCTYPE html>
<title>Emphasis marks for unrepresentable characters should not crash</title>
<link rel="author" title="Emil A Eklund" href="[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-text-decor-3/#emphasis-marks" title="3 Emphasis Marks">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  div {
    text-emphasis: circle;
    -webkit-text-emphasis-style: circle;
  }
</style>
<body>
  <div></div>
</body>
<script>
  var el = document.body.firstElementChild;
  el.appendChild(document.createTextNode(unescape('%udb14')));
  el.appendChild(document.createTextNode(unescape('%udfe3%u7af4')));
</script>
<script>test(()=>{})</script>

chromium/third_party/blink/web_tests/external/wpt/css/css-text-decor/text-emphasis-unrepresentable-characters.html