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.
Generated using TypeDoc
Asynchronous callback for creating a persistable document from some other object.
XXXbz This should really be changed to just return a promise that then gets resolved or rejected...
See
WebBrowserPersistable in FrameLoader.webidl.