This document promotes upgrading a website to use HTML5 for its mobile capabilities. It notes that customers are no longer chained to desktops and are using mobile devices more, demanding more options. HTML5 solutions can make a website faster, more efficient, intuitive and compatible across devices. Retrofitting old code would be cumbersome, expensive and hacky, while semantic coding and HTML5 features like video, SEO and accessibility improvements can give content an energy boost and build for the future.