✓ 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
Nearly complete implementation with correct physics (Au 19.3 g/cm³, Au/Ag 13.0 g/cm³, same 1000 g mass), SVG-only custom drag slider works well but lacks a native range input and the handle drag area is small and fiddly; mass/density values are static in the panels rather than truly reactive, but displaced water updates live and the Heureka animation at slider bottom is a polished touch.
10,469 output tokens · claude-opus-4-6 · end_turn
Nearly complete implementation with correct physics (Au 19.3 g/cm³, Au/Ag 13.0 g/cm³, same 1000 g mass), SVG-only custom drag slider works well but lacks a native range input and the handle drag area is small and fiddly; mass/density values are static in the panels rather than truly reactive, but displaced water updates live and the Heureka animation at slider bottom is a polished touch.