@ DocumentNode (location: (1:0)-(6:0))
└── children: (2 items)
    ├── @ HTMLElementNode (location: (1:0)-(5:5))
    │   ├── open_tag:
    │   │   └── @ HTMLOpenTagNode (location: (1:0)-(1:4))
    │   │       ├── tag_opening: "<" (location: (1:0)-(1:1))
    │   │       ├── tag_name: "h1" (location: (1:1)-(1:3))
    │   │       ├── tag_closing: ">" (location: (1:3)-(1:4))
    │   │       ├── children: []
    │   │       └── is_void: false
    │   │
    │   ├── tag_name: "h1" (location: (1:1)-(1:3))
    │   ├── body: (3 items)
    │   │   ├── @ HTMLTextNode (location: (1:4)-(2:2))
    │   │   │   └── content: "\n  "
    │   │   │
    │   │   ├── @ ERBWhileNode (location: (2:2)-(4:11))
    │   │   │   ├── tag_opening: "<%" (location: (2:2)-(2:4))
    │   │   │   ├── content: " while true " (location: (2:4)-(2:16))
    │   │   │   ├── tag_closing: "%>" (location: (2:16)-(2:18))
    │   │   │   ├── statements: (1 item)
    │   │   │   │   └── @ HTMLTextNode (location: (2:18)-(4:2))
    │   │   │   │       └── content: "\n    true\n  "
    │   │   │   │
    │   │   │   └── end_node:
    │   │   │       └── @ ERBEndNode (location: (4:2)-(4:11))
    │   │   │           ├── tag_opening: "<%" (location: (4:2)-(4:4))
    │   │   │           ├── content: " end " (location: (4:4)-(4:9))
    │   │   │           └── tag_closing: "%>" (location: (4:9)-(4:11))
    │   │   │
    │   │   │
    │   │   └── @ HTMLTextNode (location: (4:11)-(5:0))
    │   │       └── content: "\n"
    │   │
    │   ├── close_tag:
    │   │   └── @ HTMLCloseTagNode (location: (5:0)-(5:5))
    │   │       ├── tag_opening: "</" (location: (5:0)-(5:2))
    │   │       ├── tag_name: "h1" (location: (5:2)-(5:4))
    │   │       └── tag_closing: ">" (location: (5:4)-(5:5))
    │   │
    │   └── is_void: false
    │
    └── @ HTMLTextNode (location: (5:5)-(6:0))
        └── content: "\n"