✓ 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
Solid ASCII-art implementation with correct physics (gold 19.3 g/cm³, fake ~3.0 g/cm³, same 321 g mass, ~6.4× volume ratio), but the "fall animation" is purely slider-driven with no autonomous drop motion, and the ASCII water-rise scaling (0.08 lines/cm³) compresses the visually distinct displacement difference into at most ~8 lines, underrepresenting the dramatic 6.4× ratio.
Solid ASCII-art implementation with correct physics (gold 19.3 g/cm³, fake ~3.0 g/cm³, same 321 g mass, ~6.4× volume ratio), but the "fall animation" is purely slider-driven with no autonomous drop motion, and the ASCII water-rise scaling (0.08 lines/cm³) compresses the visually distinct displacement difference into at most ~8 lines, underrepresenting the dramatic 6.4× ratio.