+ Web Semantics ( Rich Snippets with RDFa, MicroFormats, Microdata Schema.org, Open Graph, Twitter Cards, Google Authorship ) + UX using HTML5 / CSS3 / LESS or SASS / jQuery ( Open-Source Plugins ) + Responsive Web Design ( Twitter Bootstrap / Foundation / Hand-Coded ) + Cross-Browser Compatibilities ( IE, FireFox, Chrome, Safari ) + Page-Speed Optimization (Google Page Speed / WebPageTest) + Google Content Experiment ( A/B Testing )