✓ 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
Excellent SVG-based implementation with correct physics (gold 19.32 g/cm³, gilded 11.0 g/cm³, same 1000 g mass), live displaced-water values, a bar-chart comparison panel, splash/ripple effects, and a full Heureka overlay — but the slider is a custom SVG drag handle with no native range input, the crowns jump in position rather than falling, and the "fall animation" feature is absent.
13,604 output tokens · claude-opus-4-6 · end_turn
Excellent SVG-based implementation with correct physics (gold 19.32 g/cm³, gilded 11.0 g/cm³, same 1000 g mass), live displaced-water values, a bar-chart comparison panel, splash/ripple effects, and a full Heureka overlay — but the slider is a custom SVG drag handle with no native range input, the crowns jump in position rather than falling, and the "fall animation" feature is absent.