HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS lang|=en</title>
  <style>
    [lang|="en"] {
      color: #1d4ed8;
      font-weight: 600;
    }
  </style>
</head>
<body>
  <p lang="en-US">American English</p>
  <p lang="en-GB">British English</p>
  <p lang="en">Base English</p>
  <p lang="fr">Fran&ccedil;ais</p>
</body>
</html>

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CSS [attribute|=value] - lang|=en