✓ 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 features implemented with correct physics (gold 19.32 g/cm³, gilded 9.2 g/cm³, same 1000 g mass), but submerged-fraction calculation uses a simplified geometric approximation rather than true spherical cap integration, slightly underestimating mid-submersion displacement.
All 21 features implemented with correct physics (gold 19.32 g/cm³, gilded 9.2 g/cm³, same 1000 g mass), but submerged-fraction calculation uses a simplified geometric approximation rather than true spherical cap integration, slightly underestimating mid-submersion displacement.