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chromium/third_party/blink/web_tests/external/wpt/css/css-pseudo/first-letter-crash.html 

<!DOCTYPE html>
<link rel="help" href="https://crbug.com/967194">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#target:first-letter{
  float:right;
}
</style>
The test passes if it does not CRASH.
<div id="target">
  <textarea style="display: block;">A</textarea>
</div>
<script>test(() => { });</script>