✓ 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
Near-complete implementation with correct physics (ρ_gold=19.32, ρ_gilded=12.5, same 1000g mass), animated SVG crowns, splash particles, rising water levels, live data panels, and a full Heureka sequence — but the slider is SVG-custom-draggable (not a native range input) and crown Y-position interpolates linearly over the full slider range rather than only moving through the water entry zone, slightly decoupling visual submersion from the computed submerged fraction.
12,140 output tokens · claude-opus-4-6 · end_turn
Near-complete implementation with correct physics (ρ_gold=19.32, ρ_gilded=12.5, same 1000g mass), animated SVG crowns, splash particles, rising water levels, live data panels, and a full Heureka sequence — but the slider is SVG-custom-draggable (not a native range input) and crown Y-position interpolates linearly over the full slider range rather than only moving through the water entry zone, slightly decoupling visual submersion from the computed submerged fraction.