@ DocumentNode (location: (1:0)-(2:0))
└── children: (3 items)
    ├── @ HTMLTextNode (location: (1:0)-(1:1))
    │   └── content: "'"
    │
    ├── @ ERBContentNode (location: (1:1)-(1:13))
    │   ├── tag_opening: "<%=" (location: (1:1)-(1:4))
    │   ├── content: " value " (location: (1:4)-(1:11))
    │   ├── tag_closing: "%>" (location: (1:11)-(1:13))
    │   ├── parsed: true
    │   └── valid: true
    │
    └── @ HTMLTextNode (location: (1:13)-(2:0))
        └── content: "'\n"