| Level | Ancestor | Description |
|---|
| 1 | TObject | Ultimate ancestor in a class hierarchy |
| 2 | TBaseObject | A base class for objects that can be used instead of TObject. |
| 3 | TReferenceCountedObject | Object that keeps track of the number of times it is referenced from other objects |
| 4 | TValue | Base class for an immutable object that stores a value of a certain TType. |
| 5 | THtmlElement |
Abstract base class for modelling HTML elements used in HTML documents.
|
| 6 | THtmlStylableElement |
Abstract base class for HTML elements that support styling.
|
| 7 | THtmlChangeableElement | Base class for HTML input |
| 8 | THtmlTextArea | |