✓ 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
Exceptionally complete implementation with correct physics (gold 19.3 g/cm³, gilded 8.5 g/cm³, same 1000g mass), animated splash particles, continuous wave loop, live info panel, and a well-executed Heureka overlay — minor flaw is the two-phase slider approach (0–20 = approach, 20–100 = submersion) compresses the submerging range and makes crown movement feel slightly non-linear.
Exceptionally complete implementation with correct physics (gold 19.3 g/cm³, gilded 8.5 g/cm³, same 1000g mass), animated splash particles, continuous wave loop, live info panel, and a well-executed Heureka overlay — minor flaw is the two-phase slider approach (0–20 = approach, 20–100 = submersion) compresses the submerging range and makes crown movement feel slightly non-linear.