✓ 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
Exceptionally complete implementation with correct physics (gold 19.3, alloy 10.5 g/cm³, same 1000 g mass), live values, rising water, splash particles, bubbles, proportionally sized crown visuals, and a polished ΕὝΡΗΚΑ overlay with sparkles — minor flaw is the water rise is rendered in raw pixels with an ad-hoc scale rather than a clean cm³-to-pixel mapping, making the visual displacement difference between crowns less dramatic than the ~1.84× volume ratio warrants.
Exceptionally complete implementation with correct physics (gold 19.3, alloy 10.5 g/cm³, same 1000 g mass), live values, rising water, splash particles, bubbles, proportionally sized crown visuals, and a polished ΕὝΡΗΚΑ overlay with sparkles — minor flaw is the water rise is rendered in raw pixels with an ad-hoc scale rather than a clean cm³-to-pixel mapping, making the visual displacement difference between crowns less dramatic than the ~1.84× volume ratio warrants.