HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>:not([lang])</title>
  <style>
    div[lang] {
      font-weight: bold;
    }

    div:not([lang]) {
      font-style: italic;
    }
  </style>
</head>
<body>
  <div lang="en">Has lang (bold)</div>
  <div>No lang (italic)</div>
</body>
</html>

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CSS Attribute Selector — :not([lang])