"> "> "> 
<!DOCTYPE html> <!-- 1 -->
<html lang="en"> <!-- 2 -->
    <head>
        <meta charset="utf-8"> <!-- 3 -->
        <meta name="color-scheme" content="light dark"> <!-- 4 -->
        <meta name="viewport" content="width=device-width"> <!-- 5 -->
    </head>
    <body>
        <!-- Content -->
    </body>
</html>

  1. Lighthouse: doctype

  2. MDN: lang

    …it is recommended to always specify an appropriate value for this attribute.

  3. Lighthouse: charset

  4. web.dev: dark mode

  5. Lighthouse: viewport (initial-scale=1 is unnecessary since it’s the default)