✓ 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
Highly complete ASCII-art implementation with correct physics (gold 19.3 g/cm³, gilded 8.0 g/cm³, same 1000 g mass), live values, splash effects, water rise, and a multi-frame Heureka overlay, but the vertical slider uses a non-standard appearance hack that may not render as truly vertical in all browsers, and the submerged-crown water-overlay logic is a no-op (the loop body does nothing), leaving crowns visually unobscured by water.
Highly complete ASCII-art implementation with correct physics (gold 19.3 g/cm³, gilded 8.0 g/cm³, same 1000 g mass), live values, splash effects, water rise, and a multi-frame Heureka overlay, but the vertical slider uses a non-standard appearance hack that may not render as truly vertical in all browsers, and the submerged-crown water-overlay logic is a no-op (the loop body does nothing), leaving crowns visually unobscured by water.