✓ 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 required features implemented correctly, but the water displacement calculation uses a simplified pixel-based approximation with crown immersion inferred from a fixed 37px crown height rather than actual volume geometry, slightly compromising physical rigor; mass/volume/density values are static rather than truly live (they don't change with submersion fraction).
All required features implemented correctly, but the water displacement calculation uses a simplified pixel-based approximation with crown immersion inferred from a fixed 37px crown height rather than actual volume geometry, slightly compromising physical rigor; mass/volume/density values are static rather than truly live (they don't change with submersion fraction).