This component provides a means for a frame to keep track of the history of pages displayed in that frame.
The following table lists the observable properties associated with this component.
| Property | Description | Type | Access |
|---|---|---|---|
| after | The reference to the history entry that is after the current position in the history. The value of this property is null if no such entry exists. | History Entry | read |
| before | The reference to the history entry that is before the current position in the history. The value of the property is null if no such entry exists. | History Entry | read |
| hasAfter | If the value of the after property is null, then the value of this property is 'true', otherwise it is 'false'. | boolean | read |
| hasBefore | If the value of the before property is null, then the value of this property is 'true', otherwise it is 'false'. | boolean | read |