Optional
aInstancePtr: objectA run time mechanism for interface discovery.
NS_OK if the interface is supported by the associated instance, NS_NOINTERFACE if it is not.
aInstancePtr must not be null.
[in] A requested interface IID
[out] A pointer to an interface pointer to receive the result.
Retrun an element associated with the given element. It's implemented by container elements having relation between their items. For example, this interface is implemented by XUL tabs and XUL tabpanels elements and used to get XUL tab element by linked tab panel and vice versa.
Generated using TypeDoc
Increases the reference count for this interface. The associated instance will not be deleted unless the reference count is returned to zero.
Returns
The resulting reference count.