HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>lang — document default</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 1rem;font-size:1.25rem;color:#0f172a}.panel{max-width:520px;padding:1rem 1.25rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:520px}</style>

</head>

<body>

  <h1>&lt;html lang="en"&gt;</h1>

  <div class=panel>

    <p style=margin:0>This page declares English as its primary language. Screen readers and search engines use <code>document.documentElement.lang</code> (<strong>en</strong>).</p>

  </div>

  <p class=hint>Always set <code>lang</code> on <code>&lt;html&gt;</code>. Use BCP 47 codes like <code>en-US</code> or <code>es</code> when needed.</p>

</body>

</html>

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HTML lang Attribute — Document Default Language