✓ 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 SVG-only implementation with correct physics (Au 19.3 g/cm³, alloy 13.0 g/cm³, same 1000 g mass), live data panel, splash particles, wave animation, rising water levels, and a pulsing HEUREKA on full immersion; main weaknesses are the custom drag-only slider (no native input range, so keyboard/scroll inaccessible) and mass/volume/density values are static rather than interpolating live with immersion depth.
9,584 output tokens · claude-opus-4-6 · end_turn
Exceptionally complete SVG-only implementation with correct physics (Au 19.3 g/cm³, alloy 13.0 g/cm³, same 1000 g mass), live data panel, splash particles, wave animation, rising water levels, and a pulsing HEUREKA on full immersion; main weaknesses are the custom drag-only slider (no native input range, so keyboard/scroll inaccessible) and mass/volume/density values are static rather than interpolating live with immersion depth.