✓ 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 6.8 g/cm³, same 300 g mass), live panel, rising water, heureka trigger — but lacks a true smooth fall animation (crowns jump discretely via slider only, no autonomous drop motion) and the ASCII crown rendering is minimal/misaligned.
Solid ASCII-art implementation with correct Archimedes physics (gold 19.3 g/cm³, gilded 6.8 g/cm³, same 300 g mass), live panel, rising water, heureka trigger — but lacks a true smooth fall animation (crowns jump discretely via slider only, no autonomous drop motion) and the ASCII crown rendering is minimal/misaligned.