All mobi sites must be optimized for viewing on a mobile phone, providing the major advantage of the domain, from the users' perspective, of compatible content. Websites may be optimized for the special capabilities and restrictions of mobile devices, such as smaller screens, device form/size, device input/output options, existence of embedded sensors (acceleration, location, touch, etc.), as well as human factors such as expectations of immediacy of results, context awareness under a shortened attention span (compared to non-mobile device use of the Internet). Although other top-level domains can technically employ the same optimizations for mobile phones, in practice, only a fraction of them do, thus necessitating content adaptation solutions. These retrofit the content to target devices independent from the original process of creating the site. On the other hand, dotMobi promotes creating two separate device-dependent World Wide Webs, one desktop-based and the other mobile-based, and thus risks producing redundant content. From a content provider perspective, having to maintain two separate website also represents more work.
