✓ 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 physics implementation with correct densities (19.3 vs 13.0 g/cm³), same mass, visible differential water rise, and Heureka trigger, but lacks true fall animation (crowns teleport with slider rather than animating independently) and the splash is opacity-based rather than particle-driven motion.
Solid physics implementation with correct densities (19.3 vs 13.0 g/cm³), same mass, visible differential water rise, and Heureka trigger, but lacks true fall animation (crowns teleport with slider rather than animating independently) and the splash is opacity-based rather than particle-driven motion.