✓ 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
Solid implementation with correct physics (gold 19.3 g/cm³, alloy 13.0 g/cm³, same 1000g mass), visually distinct crowns, live data displays, and Heureka animation, but the slider is a custom SVG drag handle rather than a native vertical range input, fall animation is absent (crowns jump directly to position), and splash particles are rudimentary static repositioning rather than true particle animation.
11,628 output tokens · claude-opus-4-6 · end_turn
Solid implementation with correct physics (gold 19.3 g/cm³, alloy 13.0 g/cm³, same 1000g mass), visually distinct crowns, live data displays, and Heureka animation, but the slider is a custom SVG drag handle rather than a native vertical range input, fall animation is absent (crowns jump directly to position), and splash particles are rudimentary static repositioning rather than true particle animation.