✓ 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 implementation with correct Archimedes physics (ρ_gold=19.32, ρ_fake=11.00, same 1000g mass), SVG-based custom drag slider (not a native input), splash particles, ripple effects, wave animation, live data panel, and a dramatic dismissible Heureka overlay — only weakness is the custom slider lacks keyboard/accessibility support and the water-level pixel markers ("px") are a minor cosmetic oddity instead of cm units.
12,831 output tokens · claude-opus-4-6 · end_turn
Exceptionally complete implementation with correct Archimedes physics (ρ_gold=19.32, ρ_fake=11.00, same 1000g mass), SVG-based custom drag slider (not a native input), splash particles, ripple effects, wave animation, live data panel, and a dramatic dismissible Heureka overlay — only weakness is the custom slider lacks keyboard/accessibility support and the water-level pixel markers ("px") are a minor cosmetic oddity instead of cm units.