wpt/css/css-pseudo/first-letter-capitalize-supplementary-char.html at master · web-platform-tests/wpt · GitHub

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<!doctype html>
<html>
<head>
  <meta charset="utf-8">
  <title>CSS Test: ::first-letter with text-transform:capitalize after supplementary character</title>
  <link rel="author" title="Chris Dumez" href="mailto:cdumez@apple.com">
  <link rel="match" href="first-letter-capitalize-supplementary-char-ref.html">
  <link rel="help" href="https://drafts.csswg.org/css-pseudo-4/#first-letter-styling">
  <link rel="help" href="https://drafts.csswg.org/css-text-3/#text-transform-property">
  <meta name="assert" content="When ::first-letter captures a supplementary Unicode character (surrogate pair), text-transform:capitalize on the remaining text must correctly identify the previous character for word boundary detection.">
  <style>
  .test {
    font-size: 36px;
    text-transform: capitalize;
  }
  .test::first-letter {
    color: green;
  }
  </style>
</head>
<body>
  <!-- U+1D400 (MATHEMATICAL BOLD CAPITAL A) is a supplementary character (surrogate pair in UTF-16).
       "bc" continues the same word, so capitalize should NOT uppercase "b".
       "def" is a new word, so capitalize SHOULD uppercase "d". -->
  <div class="test">&#x1D400;bc def</div>
</body>
</html>