MOBILE FIRST DESIGN
Responsive design considerations begin with the initial wireframes and continue through final site testing to ensure a clean user experience and cross platform device compatibility. By starting with the mobile platform as the primary consideration, the design process is focused on the minimal design components necessary to fulfil key user story tasks. This approach yields elegant designs and clean code for the entire web project. Compared to building out a complete desktop experience and then pairing it down as an afterthought for mobile phones, mobile first design is a superior approach to designing and programming responsive websites.
HTML5 WEB DESIGN