✓ 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 are implemented correctly with solid physics (gold 19.3 g/cm³, gilded 8.0 g/cm³, same 1000g mass), but the water-rise visual scale factor (VOL_TO_PX=0.35) is arbitrary and the displacement difference between crowns is subtle on-screen despite correct numeric readouts.
All required features are implemented correctly with solid physics (gold 19.3 g/cm³, gilded 8.0 g/cm³, same 1000g mass), but the water-rise visual scale factor (VOL_TO_PX=0.35) is arbitrary and the displacement difference between crowns is subtle on-screen despite correct numeric readouts.