- Semantic HTML, CSS2, detect for JS
- Load CSS3 later (the first media query is no media query support)
- Load scripts asynchronously (yepnope, Modernizr.load, or lab.js)
- Load heavy content later, but keep it available to mobile users
- If web fonts are desired, conditionally load those
- Media queries
- Flexible images and SVG
- Flexible grid (content)
- Navigation
- Compass/Sass
- Prefix-free