Responsive Design 的核心模型：流式优先，而不是设备列表 | CSS
本章覆盖：responsive design；fluid layout；flexible media；media queries；content-first；mobile-first；breakpoint 应由内容断裂点驱动；不为每个手机型号写 breakpoint；progressive enhancement；page vs component responsiveness。
本章知识点
- responsive design
- fluid layout
- flexible media
- media queries
- content-first
- mobile-first
- breakpoint 应由内容断裂点驱动
- 不为每个手机型号写 breakpoint
- progressive enhancement
- page vs component responsiveness