This section comprehends the next files in 4-frames-and-windos
├── 01-popup-windows
│   └── article.md
├── 03-cross-window-communication
│   ├── article.md
│   ├── postmessage.view
│   └── sandbox.view
├── 06-clickjacking
│   ├── article.md
│   ├── clickjacking-visible.view
│   ├── clickjacking.view
│   ├── protector.view
│   └── top-location.view
└── index.md