功能 features
- ✔ anchor 标题锚点
- ✔ table of contents TOC目录列表
    - ✔ responsive
 
- ✔ header nav bar 顶部导航
    - ✔ responsive
 
- ✔ feature images 封面图
- ✔ responsive fonts size 响应式字体
- ✔ code style 代码格式
- 🔘 code reference 代码引用
- 🔘 comments 评论
页面结构 Page Structure
body
├─ nav
│  ├─ a.brand
│  └─ ul
│
├─ main
│  ├─ header
│  │    ├─ h1
│  │    └─ address
│  ├─ article
│  │    ├─ section
│  │    └─ aside
│  └─ footer
│
└─ footer