✓ 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
Comprehensive ASCII-art implementation hits nearly every feature checklist item with correct physics (gold 19.3, alloy 13.0 g/cm³, same 1000 g mass), smooth RAF interpolation, splash particles, and rising water rows, but the ASCII rendering medium limits visual clarity of the water-rise difference and crown immersion is only coarsely quantized to character rows.
Comprehensive ASCII-art implementation hits nearly every feature checklist item with correct physics (gold 19.3, alloy 13.0 g/cm³, same 1000 g mass), smooth RAF interpolation, splash particles, and rising water rows, but the ASCII rendering medium limits visual clarity of the water-rise difference and crown immersion is only coarsely quantized to character rows.