NOTE: These notes are based on Section 5 in Build Responsive Real World Websites with HTML5 and CSS3 by Jonas Schmedtmann --- so they are his design opinions :)
Responsive Web Design
- Fluid grid: all layout elements are sized in relative units, such as percentages, instead of absolute units like pixels
- Flexible images: are also sized in relative units
- Media queries: allow us to specify different CSS style rules for different browser widths