✓ 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, feature-complete implementation with correct physics (Au 19.3 g/cm³ vs 13.0 g/cm³, same 1000 g mass), live values, visible water rise difference, and Heureka animation, but the crown movement is a direct position jump rather than a smooth fall animation, splash triggering is probabilistic/erratic, and the SVG-custom-slider UX (drag only, no thumb-position indicator bug) is rougher than a native input range.
10,279 output tokens · claude-opus-4-6 · end_turn
Solid, feature-complete implementation with correct physics (Au 19.3 g/cm³ vs 13.0 g/cm³, same 1000 g mass), live values, visible water rise difference, and Heureka animation, but the crown movement is a direct position jump rather than a smooth fall animation, splash triggering is probabilistic/erratic, and the SVG-custom-slider UX (drag only, no thumb-position indicator bug) is rougher than a native input range.