✓ 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 (Au 19.3 g/cm³ vs Au-Ag 13.0 g/cm³, same 1000 g mass), differential water rise, and Heureka trigger, but lacks true frame-by-frame fall animation (crown teleports based on slider position rather than animating autonomously) and the splash effect is minimal/ASCII-only.
Solid ASCII-art implementation with correct Archimedes physics (Au 19.3 g/cm³ vs Au-Ag 13.0 g/cm³, same 1000 g mass), differential water rise, and Heureka trigger, but lacks true frame-by-frame fall animation (crown teleports based on slider position rather than animating autonomously) and the splash effect is minimal/ASCII-only.