✓ 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 in ASCII-art style with accurate physics (same mass 1000g, gold 19.3 g/cm³ vs gilded 13.0 g/cm³, larger volume = more displacement), but mass/volume/density are static display values rather than live-computed from slider state, and the water-rise row-scaling is an approximation rather than true volumetric simulation.
All required features are implemented correctly in ASCII-art style with accurate physics (same mass 1000g, gold 19.3 g/cm³ vs gilded 13.0 g/cm³, larger volume = more displacement), but mass/volume/density are static display values rather than live-computed from slider state, and the water-rise row-scaling is an approximation rather than true volumetric simulation.