✓ 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
Nearly complete implementation with correct physics (gold 19.3 g/cm³, gilded 6.8 g/cm³, same 1000 g mass), clean dual-canvas layout, working splash particles, and a polished Heureka overlay — minor flaw is the buoyancy unit calculation uses a redundant ×0.01 then ×1000 factor that inflates displayed mN values inconsistently.
Nearly complete implementation with correct physics (gold 19.3 g/cm³, gilded 6.8 g/cm³, same 1000 g mass), clean dual-canvas layout, working splash particles, and a polished Heureka overlay — minor flaw is the buoyancy unit calculation uses a redundant ×0.01 then ×1000 factor that inflates displayed mN values inconsistently.