Focus this field, then send hotkey ["ctrl","s"]. The status line must report
ctrl=true key=s. PostMessage-only paths report ctrl=false because
the OS modifier state is never updated. SendInput-routed hotkeys report ctrl=true.
Click on the blue dot at (60, 60) inside the box. Status shows the absolute viewport pixel and the offset from the target center — <2px is a passing precision test.
Drag the blue square into the dashed target. Status must show all three events:
dragstart → dragover → drop with the source label.
Scroll this container with the scroll tool. Status shows the current
scrollTop in pixels.