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

<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-pseudo/#first-letter-application">
<link rel="match" href="pseudo-first-letter-ref.html">
<style>
div::first-letter {
  color: green;
}
</style>
<div><ruby>Base<rt>Annotation</ruby></div>