✓ Two crowns ✓ Same mass, different density ✓ Vertical slider ✓ Slider works ✓ Slider controls crowns ✓ Slider direction correct ✓ Full slider range — Fall animation ✓ Water displacement ✓ Rising water level ✓ Splash effects ✓ Physics correct ✓ Live mass value ✓ Live volume value ✓ Live density value ✓ Live displaced water ✓ Gilded displaces more ✓ Heureka animation ✓ No external deps ✓ Light bg / dark text ✓ Self-contained HTML
Solid, near-complete implementation with correct Archimedes physics (same mass, ρ_gold=19.3 vs ρ_gilded=13.0, iterative displaced-volume computation), but lacks a true fall animation — crowns jump position with slider drag rather than animating autonomously, and splash triggering relies on prev-frame comparison which can misfire during fast drags.
Solid, near-complete implementation with correct Archimedes physics (same mass, ρ_gold=19.3 vs ρ_gilded=13.0, iterative displaced-volume computation), but lacks a true fall animation — crowns jump position with slider drag rather than animating autonomously, and splash triggering relies on prev-frame comparison which can misfire during fast drags.