✓ 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
Remarkably complete implementation with correct physics (gold 19.3 g/cm³, gilded 10.5 g/cm³, same 1000 g mass), animated wave surface, splash effects, rising water levels, visual comparison bars, buoyancy force display, and a bouncing/color-cycling Heureka overlay — the only notable weakness is the slider uses a CSS vertical hack that may not render as a true vertical slider in all browsers.
Remarkably complete implementation with correct physics (gold 19.3 g/cm³, gilded 10.5 g/cm³, same 1000 g mass), animated wave surface, splash effects, rising water levels, visual comparison bars, buoyancy force display, and a bouncing/color-cycling Heureka overlay — the only notable weakness is the slider uses a CSS vertical hack that may not render as a true vertical slider in all browsers.