
Makes debugging semantics easier (e.g. which RenderObject has semantics, where is a SemanticNode seen in the semantic tree comming from, etc). It's only printed if accessibility is turned on.
Flutter
Flutter is a new way to build high-performance, cross-platform mobile apps. Flutter is optimized for today's — and tomorrow's — mobile devices. We are focused on low-latency input and high frame rates on Android and iOS.
See the getting started guide for information about using Flutter.