A PageSupplier is able to create different instances of Pages, but needs to know what the type of the class being injected into to know which to use. For example

@TestPage
RegistrationPage registrationPage

@TestPage
WelcomePage welcomePage

Supplier would be something like:

InstanceWrapper<T, S> getValue(Registry registry, S annotation, Class<? extends T> type);

This would in turn mean that the page supplier would create multiple instances, and the registry would select the correct one based on the class type. The registry would use the injected class type as an instance reference.