Readonly childThe nsILoadGroup associated with this nsILoadGroupChild
The parent of this load group. It is stored with a nsIWeakReference/nsWeakPtr so there is no requirement for the parentLoadGroup to out live the child, nor will the child keep a reference count on the parent.
Readonly rootThe rootLoadGroup is the recursive parent of this load group where parent is defined as parentlLoadGroup if set or childLoadGroup.loadGroup as a backup. (i.e. parentLoadGroup takes precedence.) The nsILoadGroup child is the root if neither parent nor loadgroup attribute is specified.
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.
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nsILoadGroupChild provides a hierarchy of load groups so that the root load group can be used to conceptually tie a series of loading operations into a logical whole while still leaving them separate for the purposes of cancellation and status events.