| Value | Meaning |
|---|---|
| Private0 | Invalid value, used as a marker |
| Widget1 | Window that floats over scrolling areas. |
| Text2 | Scrollable text window. |
| Left3 | Left side border window. |
| Right4 | Right side border window. |
| Top5 | Top border window. |
| Bottom6 | Bottom border window. |
Used to reference the parts of #GtkTextView.