HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>lang vs attribute</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }
    p { margin: 8px 0; }
    #output { margin-top: 12px; padding: 12px; background: #fef3c7; font-family: monospace; white-space: pre-wrap; }
  </style>
</head>
<body>
  <p lang="fr">Français (fr)</p>
  <p lang="fr-CA">Français Canada (fr-CA)</p>
  <p lang="en">English</p>
  <div id="output"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#output").text(
      ":lang(fr) → " + $("p:lang(fr)").length + '\n[lang="fr"] → ' + $('p[lang="fr"]').length
    );
  </script>
</body>
</html>

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

:lang(fr) vs [lang="fr"] (Try It)