Sec,ch,ua,mobile:,?0 «BEST • 2026»

: Serve expansive, multi-column designs rather than single-column mobile stacks.

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) sec,ch,ua,mobile:,?0

: Deliver larger images or background videos that might be too heavy for mobile data connections. : Serve expansive