Original triangle explanation. Total 9 seconds. A is already visible; B fades at 33–44% (2.97–3.96 s); C fades at 66–77% (5.94–6.93 s); edges fade at 88–100% (7.92–9 s). One iteration holds the final state. Manual play/pause/static controls and a system reduced-motion rule preserve the complete static text. Browser interaction and preference behavior require separate tests.
