Today, designing for mobile is an inevitable aspect of web design. Web pages utilizing responsive design can transition into a "mobile" screen size even on a desktop/laptop, and many desktop/laptop devices now include touchscreen gesture control. Many mobile devices can be connected to an external keyboard and mouse, and mobile operating systems have been used for laptop devices.
What to Consider
Ensure that content provided by accessing a URI yields a thematically coherent experience when accessed from different devices.
Exploit device capabilities to provide an enhanced user experience.
Take reasonable steps to work around deficient implementations.
Carry out testing on actual devices as well as emulators.
Mobile Accessibility: How WCAG 2.0 and Other W3C/WAI Guidelines Apply to Mobile
Mobile Accessibility Standards and Guidelines at W3C