What is Child Container Resolution in Aurelia?

Now, imagine that we have a Container named root and we call root.createChild() to create a child container named child. Then, we invoke child.get(A) to resolve an instance of A.

What will happen? First, child checks for a Resolver for A. If none is found, then it calls get(A) on its parent which is the root container from which it was created. root then checks to see if it has a Resolver. If not, it auto-registers A in root and then immediately calls the Resolver to get an instance of A.