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chromium/third_party/blink/web_tests/external/wpt/css/css-pseudo/first-letter-with-span-ref.html 

<!DOCTYPE HTML>
<title>Reference: The ::first-letter should work with quote text span element</title>
<link rel="author" title="Jaeyong Bae" href="[email protected]">
<style>
  span { color: red }
</style>
<p>
  <span>"</span>abc"
</p>