Cross-Device Check

Test the supported environment, not a device label. Reproduce each defect under the capabilities and display conditions that trigger it.

1. Establish the support matrix

Inspect the engine or runtime, build and run commands, declared platforms, internal resolution and scaling policy, UI system, safe-area handling, and supported input capabilities. Read project configuration and distribution targets before assuming that phone, desktop, or controller support is required.

If the support matrix is missing, infer it from the delivery environment and state the assumption. Ask the user when choosing the wrong platform would materially change the work. For an otherwise unspecified browser game, use device-baselines.md as a provisional matrix.

2. Reproduce the matrix