✓ 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 Archimedes physics (gold 19.3 g/cm³, gilded 13.0 g/cm³, same mass, gilded displaces more), live data panel, and Heureka fade-in at slider end; however, animation is purely text-based with no smooth fall motion, splash effects are stochastic and weak, and the crown rendering suffers from character-width alignment issues with Unicode symbols in monospace.
Solid ASCII-art implementation with correct Archimedes physics (gold 19.3 g/cm³, gilded 13.0 g/cm³, same mass, gilded displaces more), live data panel, and Heureka fade-in at slider end; however, animation is purely text-based with no smooth fall motion, splash effects are stochastic and weak, and the crown rendering suffers from character-width alignment issues with Unicode symbols in monospace.