@ DocumentNode (location: (1:0)-(1:90))
└── children: (1 item)
    └── @ HTMLDoctypeNode (location: (1:0)-(1:90))
        ├── tag_opening: "<!DOCTYPE" (location: (1:0)-(1:9))
        ├── children: (1 item)
        │   └── @ LiteralNode (location: (1:9)-(1:89))
        │       └── content: " HTML PUBLIC \"-//W3C//DTD HTML 4.01//EN\" \"http://www.w3.org/TR/html4/strict.dtd\""
        │
        └── tag_closing: ">" (location: (1:89)-(1:90))