Nested UITransition Demo

This file demonstrates an outer UITransition wrapping an inner UITransition. Switching between Page A & Page B uses a slide-left content transition. Inside each page, switching between its sections uses a cross-fade content transition. This allows you to see how a long/larger transition (page slide) can encompass/overlap smaller fades.

Outer: transitionType = "slide-left" (content transition).
Inner: transitionType = "cross-fade" (content transition).
Both layers have independent size transitions.
Open devtools console to observe any debug logs (if enabled in the library build). Try switching pages mid section fade to see nested transition interplay.