✓ 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 g/cm³, gilded 2.7 g/cm³, same 1000g mass, ~7× volume ratio), smooth SVG animations, particle splash effects, water shimmer loop, and a polished Heureka overlay with pulsing text — the only notable weakness is the shimmer animation loop overrides waterSurface Y values and can fight with the displacement update logic, potentially causing minor visual jitter at the surface.
Exceptionally complete implementation with correct physics (gold 19.3 g/cm³, gilded 2.7 g/cm³, same 1000g mass, ~7× volume ratio), smooth SVG animations, particle splash effects, water shimmer loop, and a polished Heureka overlay with pulsing text — the only notable weakness is the shimmer animation loop overrides waterSurface Y values and can fight with the displacement update logic, potentially causing minor visual jitter at the surface.