Index - O
| onLayer | Ipe.Types, Ipe |
| OnlyMarkedViews | Ipe.IpeToIpe |
| Opacity | Ipe.Attributes, Ipe |
| OpacitySym0 | Ipe.Attributes, Ipe |
| OpaqueBackground | Ipe.IpeRender |
| Operation | Ipe.Path |
| Options | |
| 1 (Type/Class) | Ipe.IpeRender |
| 2 (Data Constructor) | Ipe.IpeRender |
| 3 (Type/Class) | Ipe.IpeToIpe |
| 4 (Data Constructor) | Ipe.IpeToIpe |
| orange | Ipe.Color |