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chromium/third_party/blink/web_tests/external/wpt/css/css-fonts/crash-large-grapheme-cluster.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Should not crash when there is an exceedingly large grapheme cluster</title>
<link rel="author" href="mailto:[email protected]">
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1255482">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="target"></div>
<script>
test(() => {
  target.textContent = 'e' + '\u0301'.repeat(35000) + 'X';
  target.offsetWidth;
});
</script>