HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>nested lang demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 32rem; }
   div { padding: 10px; margin: 8px 0; border: 1px solid #e2e8f0; border-radius: 6px; }
  </style>
</head>
<body>
  <div lang="ja">
    <span>こんにちは</span>
    <div><span>ネストされたテキスト</span></div>
  </div>
  <div lang="en">
    <span>Hello</span>
  </div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("div:lang(ja) span").css("fontStyle", "italic");
  </script>
</body>
</html>

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Nested div:lang(ja) inheritance (Try It)