✓ 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
All 21 required features are implemented correctly with solid physics (gold 19.3 g/cm³, gilded 13.0 g/cm³, same 1000 g mass), but water-rise calculation is approximate/pixel-scaled rather than derived from true volumetric geometry, and splash particles are not clipped to the container bounds.
All 21 required features are implemented correctly with solid physics (gold 19.3 g/cm³, gilded 13.0 g/cm³, same 1000 g mass), but water-rise calculation is approximate/pixel-scaled rather than derived from true volumetric geometry, and splash particles are not clipped to the container bounds.