When a server identifies a user as desktop-based via this header, you should deliver:
: It follows the Structured Field Values format, using a question mark followed by a boolean: ?0 : Desktop (False). ?1 : Mobile (True). sec,ch,ua,mobile:,?0
The header sec-ch-ua-mobile: ?0 is a that tells a web server the request is coming from a desktop device . When a server identifies a user as desktop-based
The ?0 value is a boolean indicator where 0 means "false" (not a mobile device). If you are "drafting proper content" based on this header, your server-side logic should prioritize and features. Content Strategy for ?0 (Desktop) : Enable mega-menus and secondary sidebars that require
: It is part of the Privacy Sandbox initiative to reduce the information leaked by traditional "User-Agent" strings.
: Enable mega-menus and secondary sidebars that require significant screen real estate. Context and Syntax
For more technical implementation details, you can refer to the official documentation on MDN Web Docs. Sec-CH-UA-Mobile header - HTTP - MDN Web Docs