Tenants of Responsive Design

• Fluid sizing expressed in relative untis like percentages or ems
• Flexible image sizing ...
• Use of media queries to provide alternate styling based on device characteristics.

Mobile First?

Pre-dates Responsive Design:

• Design for mobile,
• using simple markup first,
• don't rely on graceful degredation,
• to make things work on mobile.

Accesibility vs Responsive Design

Responsive design and accessibility have a lot in common:

• Designing for visual challenges: human or device?
• Logical structuring: aids navigation or allows re-arrangement?
• Annotations: enables semantics or enables adaptive UX frameworks?