@ DocumentNode (location: (1:0)-(1:28))
└── children: (1 item)
    └── @ HTMLElementNode (location: (1:0)-(1:28))
        ├── open_tag:
        │   └── @ HTMLOpenTagNode (location: (1:0)-(1:23))
        │       ├── tag_opening: "<" (location: (1:0)-(1:1))
        │       ├── tag_name: "h1" (location: (1:1)-(1:3))
        │       ├── tag_closing: ">" (location: (1:22)-(1:23))
        │       ├── children: (1 item)
        │       │   └── @ HTMLAttributeNode (location: (1:4)-(1:22))
        │       │       ├── name:
        │       │       │   └── @ HTMLAttributeNameNode (location: (1:4)-(1:6))
        │       │       │       └── name: "id" (location: (1:4)-(1:6))
        │       │       │
        │       │       ├── equals: "=" (location: (1:6)-(1:7))
        │       │       └── value:
        │       │           └── @ HTMLAttributeValueNode (location: (1:7)-(1:22))
        │       │               ├── open_quote: """ (location: (1:7)-(1:8))
        │       │               ├── children: (1 item)
        │       │               │   └── @ ERBContentNode (location: (1:8)-(1:21))
        │       │               │       ├── tag_opening: "<%=" (location: (1:8)-(1:11))
        │       │               │       ├── content: " "test" " (location: (1:11)-(1:19))
        │       │               │       ├── tag_closing: "%>" (location: (1:19)-(1:21))
        │       │               │       ├── parsed: true
        │       │               │       └── valid: true
        │       │               │
        │       │               ├── close_quote: """ (location: (1:21)-(1:22))
        │       │               └── quoted: true
        │       │
        │       │
        │       └── is_void: false
        │
        ├── tag_name: "h1" (location: (1:1)-(1:3))
        ├── body: []
        ├── close_tag:
        │   └── @ HTMLCloseTagNode (location: (1:23)-(1:28))
        │       ├── tag_opening: "</" (location: (1:23)-(1:25))
        │       ├── tag_name: "h1" (location: (1:25)-(1:27))
        │       └── tag_closing: ">" (location: (1:27)-(1:28))
        │
        └── is_void: false