HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>@charset invalid quotes</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
      line-height: 1.5;
      max-width: 40rem;
    }

    .bad {
      color: #b91c1c;
      font-family: Consolas, monospace;
    }

    .good {
      color: #047857;
      font-family: Consolas, monospace;
    }
  </style>
</head>
<body>
  <p><span class="bad">@charset 'UTF-8';</span> — invalid (single quotes).</p>
  <p><span class="good">@charset "UTF-8";</span> — valid form.</p>
</body>
</html>

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CSS @charset At-Rule — invalid quotes