@ DocumentNode (location: (1:0)-(1:24))
└── children: (1 item)
    └── @ HTMLElementNode (location: (1:0)-(1:24))
        ├── open_tag:
        │   └── @ HTMLOpenTagNode (location: (1:0)-(1:24))
        │       ├── tag_opening: "<" (location: (1:0)-(1:1))
        │       ├── tag_name: "input" (location: (1:1)-(1:6))
        │       ├── tag_closing: "/>" (location: (1:22)-(1:24))
        │       ├── children: (1 item)
        │       │   └── @ HTMLAttributeNode (location: (1:7)-(1:21))
        │       │       ├── name:
        │       │       │   └── @ HTMLAttributeNameNode (location: (1:7)-(1:12))
        │       │       │       └── name: "value" (location: (1:7)-(1:12))
        │       │       │
        │       │       ├── equals: "=" (location: (1:12)-(1:13))
        │       │       └── value:
        │       │           └── @ HTMLAttributeValueNode (location: (1:13)-(1:21))
        │       │               ├── open_quote: """ (location: (1:13)-(1:14))
        │       │               ├── children: (1 item)
        │       │               │   └── @ LiteralNode (location: (1:14)-(1:20))
        │       │               │       └── content: "Hello!"
        │       │               │
        │       │               ├── close_quote: """ (location: (1:20)-(1:21))
        │       │               └── quoted: true
        │       │
        │       │
        │       └── is_void: true
        │
        ├── tag_name: "input" (location: (1:1)-(1:6))
        ├── body: []
        ├── close_tag: ∅
        └── is_void: true